/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=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:29:46,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:29:46,506 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:29:46,545 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:29:46,546 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:29:46,557 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:29:46,558 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:29:46,562 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:29:46,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:29:46,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:29:46,566 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:29:46,568 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:29:46,568 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:29:46,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:29:46,575 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:29:46,576 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:29:46,578 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:29:46,580 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:29:46,582 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:29:46,587 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:29:46,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:29:46,591 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:29:46,592 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:29:46,593 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:29:46,597 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 21:29:46,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 21:29:46,597 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 21:29:46,600 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 21:29:46,600 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 21:29:46,602 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 21:29:46,602 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 21:29:46,603 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 21:29:46,604 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 21:29:46,604 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 21:29:46,605 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 21:29:46,606 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 21:29:46,606 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 21:29:46,606 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 21:29:46,607 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:29:46,607 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:29:46,609 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:29:46,609 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 21:29:46,650 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:29:46,650 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:29:46,651 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:29:46,652 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:29:46,652 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:29:46,652 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:29:46,652 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:29:46,653 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:29:46,653 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:29:46,653 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:29:46,654 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:29:46,654 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:29:46,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:29:46,655 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:29:46,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:29:46,655 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:29:46,655 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:29:46,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:29:46,656 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:29:46,656 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:29:46,656 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:29:46,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:46,657 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:29:46,657 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:29:46,657 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:29:46,657 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:29:46,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:29:46,658 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:29:46,658 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:29:46,658 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=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:29:46,928 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:29:46,940 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:29:46,943 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:29:46,944 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:29:46,945 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:29:46,945 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 21:29:47,019 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a00ec1102/a03a6e9cf890400eae2ff656f3354773/FLAG06c998b6c [2020-08-21 21:29:47,476 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:29:47,477 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 21:29:47,483 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a00ec1102/a03a6e9cf890400eae2ff656f3354773/FLAG06c998b6c [2020-08-21 21:29:47,890 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a00ec1102/a03a6e9cf890400eae2ff656f3354773 [2020-08-21 21:29:47,898 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:29:47,900 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:29:47,901 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:47,901 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:29:47,904 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:29:47,905 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:47" (1/1) ... [2020-08-21 21:29:47,908 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a9c66bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:47, skipping insertion in model container [2020-08-21 21:29:47,908 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:47" (1/1) ... [2020-08-21 21:29:47,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:29:47,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:29:48,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:48,107 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:29:48,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:48,138 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:29:48,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48 WrapperNode [2020-08-21 21:29:48,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:48,139 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:29:48,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:29:48,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:29:48,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,234 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,235 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,241 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,248 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,249 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,257 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:29:48,257 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:29:48,257 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:29:48,257 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:29:48,258 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (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 21:29:48,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:29:48,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:29:48,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:29:48,313 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 21:29:48,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 21:29:48,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:29:48,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:29:48,315 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:29:48,499 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:29:48,499 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 21:29:48,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:48 BoogieIcfgContainer [2020-08-21 21:29:48,503 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:29:48,504 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:29:48,504 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:29:48,507 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:29:48,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:29:47" (1/3) ... [2020-08-21 21:29:48,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12c64790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:48, skipping insertion in model container [2020-08-21 21:29:48,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (2/3) ... [2020-08-21 21:29:48,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12c64790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:48, skipping insertion in model container [2020-08-21 21:29:48,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:48" (3/3) ... [2020-08-21 21:29:48,511 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-21 21:29:48,521 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:29:48,528 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:29:48,541 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:29:48,588 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:29:48,589 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:29:48,589 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:29:48,589 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:29:48,590 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:29:48,590 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:29:48,590 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:29:48,590 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:29:48,627 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 21:29:48,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:29:48,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:48,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:48,634 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:48,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:48,647 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-21 21:29:48,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:48,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910858421] [2020-08-21 21:29:48,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:48,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:48,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:48,812 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 21:29:48,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910858421] [2020-08-21 21:29:48,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:48,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:29:48,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220208473] [2020-08-21 21:29:48,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:29:48,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:48,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:29:48,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:48,837 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-21 21:29:48,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:48,899 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-21 21:29:48,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:29:48,902 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-21 21:29:48,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:48,910 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:29:48,910 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 21:29:48,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:48,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 21:29:48,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 21:29:48,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 21:29:48,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 21:29:48,950 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 21:29:48,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:48,951 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 21:29:48,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:29:48,952 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 21:29:48,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:29:48,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:48,953 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:48,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:29:48,953 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:48,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:48,954 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-21 21:29:48,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:48,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407615204] [2020-08-21 21:29:48,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:48,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,036 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 21:29:49,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407615204] [2020-08-21 21:29:49,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:49,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:29:49,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15388093] [2020-08-21 21:29:49,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:49,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:49,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:49,040 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-21 21:29:49,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,088 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 21:29:49,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:29:49,089 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 21:29:49,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,091 INFO L225 Difference]: With dead ends: 22 [2020-08-21 21:29:49,091 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 21:29:49,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:49,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 21:29:49,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 21:29:49,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 21:29:49,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 21:29:49,100 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-21 21:29:49,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,101 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 21:29:49,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:49,101 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 21:29:49,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 21:29:49,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,103 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:29:49,104 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-21 21:29:49,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640156850] [2020-08-21 21:29:49,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,211 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 21:29:49,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640156850] [2020-08-21 21:29:49,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:29:49,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966044702] [2020-08-21 21:29:49,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:29:49,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:29:49,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:49,213 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-21 21:29:49,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,262 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 21:29:49,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:49,263 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 21:29:49,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,264 INFO L225 Difference]: With dead ends: 24 [2020-08-21 21:29:49,264 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 21:29:49,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:49,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 21:29:49,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-21 21:29:49,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 21:29:49,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 21:29:49,274 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-21 21:29:49,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,275 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 21:29:49,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:29:49,275 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 21:29:49,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 21:29:49,276 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,276 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:29:49,277 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-21 21:29:49,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408578513] [2020-08-21 21:29:49,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,387 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 21:29:49,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408578513] [2020-08-21 21:29:49,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:29:49,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874996386] [2020-08-21 21:29:49,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:29:49,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:29:49,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:49,394 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-21 21:29:49,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,454 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 21:29:49,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:29:49,455 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 21:29:49,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,456 INFO L225 Difference]: With dead ends: 26 [2020-08-21 21:29:49,456 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:29:49,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:49,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:29:49,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-21 21:29:49,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 21:29:49,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 21:29:49,465 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-21 21:29:49,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,467 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 21:29:49,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:29:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 21:29:49,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:29:49,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,469 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:29:49,470 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,471 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-21 21:29:49,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259909673] [2020-08-21 21:29:49,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,563 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 21:29:49,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259909673] [2020-08-21 21:29:49,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:29:49,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094736885] [2020-08-21 21:29:49,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:29:49,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:29:49,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:49,566 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-21 21:29:49,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,617 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 21:29:49,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:29:49,618 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 21:29:49,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,619 INFO L225 Difference]: With dead ends: 28 [2020-08-21 21:29:49,619 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:29:49,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:49,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:29:49,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 21:29:49,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:29:49,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 21:29:49,625 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-21 21:29:49,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,626 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 21:29:49,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:29:49,626 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 21:29:49,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:29:49,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,627 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:29:49,627 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,628 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-21 21:29:49,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736870482] [2020-08-21 21:29:49,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,719 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 21:29:49,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736870482] [2020-08-21 21:29:49,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:29:49,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775637412] [2020-08-21 21:29:49,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:29:49,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:29:49,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:49,722 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-21 21:29:49,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,773 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 21:29:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:29:49,774 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-21 21:29:49,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,775 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:29:49,775 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 21:29:49,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:49,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 21:29:49,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 21:29:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 21:29:49,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 21:29:49,781 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-21 21:29:49,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,781 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 21:29:49,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:29:49,782 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 21:29:49,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:29:49,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,783 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:29:49,783 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,783 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-21 21:29:49,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833059086] [2020-08-21 21:29:49,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,863 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 21:29:49,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833059086] [2020-08-21 21:29:49,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:29:49,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561440094] [2020-08-21 21:29:49,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:29:49,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:29:49,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:49,865 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-21 21:29:49,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,927 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 21:29:49,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:29:49,928 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-21 21:29:49,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,929 INFO L225 Difference]: With dead ends: 32 [2020-08-21 21:29:49,929 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 21:29:49,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:49,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 21:29:49,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 21:29:49,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:29:49,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 21:29:49,935 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-21 21:29:49,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,935 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 21:29:49,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:29:49,935 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 21:29:49,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:29:49,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,936 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:29:49,937 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-21 21:29:49,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590019701] [2020-08-21 21:29:49,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,041 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 21:29:50,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590019701] [2020-08-21 21:29:50,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:29:50,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862500134] [2020-08-21 21:29:50,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:29:50,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:29:50,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:50,043 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-21 21:29:50,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,105 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 21:29:50,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:29:50,105 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 21:29:50,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,106 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:29:50,106 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:29:50,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:29:50,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 21:29:50,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 21:29:50,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 21:29:50,112 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-21 21:29:50,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,112 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 21:29:50,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:29:50,113 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 21:29:50,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:29:50,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,114 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:29:50,114 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,114 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-21 21:29:50,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852087476] [2020-08-21 21:29:50,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,212 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 21:29:50,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852087476] [2020-08-21 21:29:50,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:29:50,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419563069] [2020-08-21 21:29:50,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:29:50,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:29:50,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:50,215 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-21 21:29:50,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,286 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 21:29:50,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:29:50,287 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-21 21:29:50,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,288 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:29:50,288 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:29:50,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:50,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:29:50,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 21:29:50,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:29:50,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 21:29:50,294 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-21 21:29:50,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,294 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 21:29:50,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:29:50,295 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 21:29:50,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:29:50,296 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,296 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:29:50,296 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,297 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-21 21:29:50,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108785591] [2020-08-21 21:29:50,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,432 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 21:29:50,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108785591] [2020-08-21 21:29:50,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:29:50,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174762929] [2020-08-21 21:29:50,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:29:50,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:29:50,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:50,436 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-21 21:29:50,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,517 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 21:29:50,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:29:50,518 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-21 21:29:50,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,521 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:29:50,521 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:29:50,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:50,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:29:50,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 21:29:50,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:29:50,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 21:29:50,529 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-21 21:29:50,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,530 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 21:29:50,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:29:50,530 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 21:29:50,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:29:50,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,535 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:29:50,537 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,538 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-21 21:29:50,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952225310] [2020-08-21 21:29:50,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,715 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952225310] [2020-08-21 21:29:50,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:29:50,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691827603] [2020-08-21 21:29:50,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:29:50,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:29:50,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:50,717 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-21 21:29:50,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,779 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 21:29:50,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:29:50,779 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-21 21:29:50,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,780 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:29:50,780 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:29:50,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:50,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:29:50,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 21:29:50,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:29:50,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 21:29:50,785 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-21 21:29:50,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,786 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 21:29:50,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:29:50,786 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 21:29:50,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:29:50,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,787 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:29:50,787 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,788 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-21 21:29:50,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171141390] [2020-08-21 21:29:50,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,961 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171141390] [2020-08-21 21:29:50,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:29:50,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627746003] [2020-08-21 21:29:50,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:29:50,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:29:50,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:50,963 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-21 21:29:51,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,040 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 21:29:51,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:29:51,041 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-21 21:29:51,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,042 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:29:51,042 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:29:51,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:51,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:29:51,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 21:29:51,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:29:51,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 21:29:51,048 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-21 21:29:51,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,048 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 21:29:51,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:29:51,048 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 21:29:51,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:29:51,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,049 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:29:51,050 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-21 21:29:51,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216900139] [2020-08-21 21:29:51,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,211 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:51,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216900139] [2020-08-21 21:29:51,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:29:51,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784266249] [2020-08-21 21:29:51,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:29:51,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:29:51,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:51,215 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-21 21:29:51,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,310 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 21:29:51,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:29:51,311 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-21 21:29:51,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,312 INFO L225 Difference]: With dead ends: 44 [2020-08-21 21:29:51,312 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:29:51,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:51,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:29:51,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 21:29:51,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:29:51,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 21:29:51,320 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-21 21:29:51,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,320 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 21:29:51,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:29:51,320 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 21:29:51,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:29:51,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,322 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:29:51,322 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-21 21:29:51,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018376832] [2020-08-21 21:29:51,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,535 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:51,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018376832] [2020-08-21 21:29:51,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:29:51,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627514417] [2020-08-21 21:29:51,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:29:51,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:29:51,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:51,538 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-21 21:29:51,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,608 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 21:29:51,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:29:51,608 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-21 21:29:51,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,609 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:29:51,609 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:29:51,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:51,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:29:51,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 21:29:51,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:29:51,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 21:29:51,618 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-21 21:29:51,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,618 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 21:29:51,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:29:51,619 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 21:29:51,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:29:51,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,625 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:29:51,625 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-21 21:29:51,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168034148] [2020-08-21 21:29:51,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,810 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:51,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1168034148] [2020-08-21 21:29:51,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:29:51,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542347714] [2020-08-21 21:29:51,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:29:51,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:29:51,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:51,812 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-21 21:29:51,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,902 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 21:29:51,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:29:51,903 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-21 21:29:51,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,904 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:29:51,904 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:29:51,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:51,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:29:51,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 21:29:51,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:29:51,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 21:29:51,913 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-21 21:29:51,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,913 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 21:29:51,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:29:51,913 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 21:29:51,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:29:51,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,914 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:29:51,917 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,917 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-21 21:29:51,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880160301] [2020-08-21 21:29:51,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,129 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880160301] [2020-08-21 21:29:52,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:29:52,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828506613] [2020-08-21 21:29:52,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:29:52,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:29:52,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:52,134 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-21 21:29:52,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,230 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 21:29:52,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:52,230 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 21:29:52,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,231 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:29:52,231 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:29:52,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:52,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:29:52,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 21:29:52,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:29:52,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 21:29:52,237 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-21 21:29:52,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,237 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 21:29:52,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:52,237 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 21:29:52,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:29:52,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,238 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:29:52,238 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-21 21:29:52,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492748533] [2020-08-21 21:29:52,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,450 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492748533] [2020-08-21 21:29:52,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:52,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713496104] [2020-08-21 21:29:52,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:52,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:52,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:52,453 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-21 21:29:52,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,539 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 21:29:52,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:52,540 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-21 21:29:52,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,541 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:29:52,541 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:29:52,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:52,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:29:52,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 21:29:52,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:29:52,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 21:29:52,548 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-21 21:29:52,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,548 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 21:29:52,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:52,548 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 21:29:52,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:29:52,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,549 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:52,550 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,550 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-21 21:29:52,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440888145] [2020-08-21 21:29:52,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,770 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440888145] [2020-08-21 21:29:52,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:52,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276340197] [2020-08-21 21:29:52,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:52,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:52,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:52,772 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-21 21:29:52,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,893 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 21:29:52,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:52,893 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-21 21:29:52,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,895 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:29:52,895 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 21:29:52,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:52,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 21:29:52,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 21:29:52,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 21:29:52,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 21:29:52,908 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-21 21:29:52,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,909 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 21:29:52,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:52,909 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 21:29:52,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:29:52,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,910 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:52,910 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,910 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-21 21:29:52,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364025244] [2020-08-21 21:29:52,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:53,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,197 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364025244] [2020-08-21 21:29:53,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:29:53,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389507626] [2020-08-21 21:29:53,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:29:53,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:29:53,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:53,199 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-21 21:29:53,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:53,294 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 21:29:53,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:29:53,295 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-21 21:29:53,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:53,295 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:29:53,295 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 21:29:53,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:53,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 21:29:53,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 21:29:53,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:29:53,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 21:29:53,301 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-21 21:29:53,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:53,301 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 21:29:53,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:29:53,301 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 21:29:53,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:29:53,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:53,302 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:53,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:29:53,303 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:53,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:53,303 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-21 21:29:53,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:53,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769274544] [2020-08-21 21:29:53,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:53,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,620 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769274544] [2020-08-21 21:29:53,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:29:53,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136763812] [2020-08-21 21:29:53,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:29:53,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:29:53,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:53,622 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-21 21:29:53,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:53,691 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 21:29:53,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:29:53,692 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-21 21:29:53,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:53,693 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:29:53,693 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:29:53,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:53,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:29:53,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 21:29:53,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:29:53,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 21:29:53,704 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-21 21:29:53,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:53,704 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 21:29:53,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:29:53,705 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 21:29:53,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:29:53,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:53,706 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:53,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:29:53,709 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:53,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:53,710 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-21 21:29:53,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:53,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498239735] [2020-08-21 21:29:53,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:53,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:53,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,968 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498239735] [2020-08-21 21:29:53,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:29:53,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455163823] [2020-08-21 21:29:53,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:29:53,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:29:53,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:53,970 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-21 21:29:54,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,104 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 21:29:54,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:29:54,104 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-21 21:29:54,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,105 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:29:54,105 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:29:54,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:54,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:29:54,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 21:29:54,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:29:54,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 21:29:54,110 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-21 21:29:54,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,111 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 21:29:54,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:29:54,111 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 21:29:54,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:29:54,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,112 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:29:54,112 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,113 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-21 21:29:54,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299731493] [2020-08-21 21:29:54,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,391 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299731493] [2020-08-21 21:29:54,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:29:54,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360511305] [2020-08-21 21:29:54,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:29:54,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:29:54,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:54,393 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-21 21:29:54,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,466 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 21:29:54,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:29:54,466 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-21 21:29:54,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,467 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:29:54,467 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:29:54,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:54,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:29:54,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 21:29:54,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:29:54,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 21:29:54,471 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-21 21:29:54,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,472 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 21:29:54,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:29:54,472 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 21:29:54,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:29:54,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,473 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:29:54,473 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,474 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-21 21:29:54,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000602294] [2020-08-21 21:29:54,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,781 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000602294] [2020-08-21 21:29:54,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:29:54,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270120127] [2020-08-21 21:29:54,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:29:54,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:29:54,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:54,783 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-21 21:29:54,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,923 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 21:29:54,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:29:54,924 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-21 21:29:54,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,925 INFO L225 Difference]: With dead ends: 64 [2020-08-21 21:29:54,925 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:29:54,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:54,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:29:54,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 21:29:54,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:29:54,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 21:29:54,932 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-21 21:29:54,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,932 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 21:29:54,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:29:54,933 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 21:29:54,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:29:54,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,934 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:29:54,935 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-21 21:29:54,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452166451] [2020-08-21 21:29:54,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,351 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452166451] [2020-08-21 21:29:55,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:29:55,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369632706] [2020-08-21 21:29:55,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:29:55,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:29:55,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:55,356 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-21 21:29:55,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,518 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-21 21:29:55,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:29:55,519 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-21 21:29:55,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,520 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:29:55,520 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 21:29:55,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:55,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 21:29:55,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 21:29:55,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 21:29:55,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 21:29:55,527 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-21 21:29:55,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,528 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 21:29:55,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:29:55,528 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 21:29:55,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 21:29:55,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,532 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:29:55,535 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-21 21:29:55,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349313476] [2020-08-21 21:29:55,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,943 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349313476] [2020-08-21 21:29:55,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:29:55,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298810824] [2020-08-21 21:29:55,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:29:55,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:29:55,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:55,945 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-21 21:29:56,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,084 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-21 21:29:56,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:29:56,090 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-21 21:29:56,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,091 INFO L225 Difference]: With dead ends: 68 [2020-08-21 21:29:56,091 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 21:29:56,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:56,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 21:29:56,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 21:29:56,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 21:29:56,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-21 21:29:56,095 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-21 21:29:56,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,095 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-21 21:29:56,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:29:56,095 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-21 21:29:56,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 21:29:56,096 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,096 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:29:56,096 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-21 21:29:56,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137138817] [2020-08-21 21:29:56,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,519 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137138817] [2020-08-21 21:29:56,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:29:56,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739756006] [2020-08-21 21:29:56,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:29:56,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:29:56,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:56,521 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-21 21:29:56,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,677 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-21 21:29:56,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:29:56,677 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-21 21:29:56,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,678 INFO L225 Difference]: With dead ends: 70 [2020-08-21 21:29:56,678 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 21:29:56,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:56,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 21:29:56,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 21:29:56,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 21:29:56,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-21 21:29:56,683 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-21 21:29:56,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,683 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-21 21:29:56,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:29:56,683 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-21 21:29:56,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 21:29:56,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,684 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:29:56,684 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,686 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-21 21:29:56,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028068331] [2020-08-21 21:29:56,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,151 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028068331] [2020-08-21 21:29:57,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:29:57,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278903153] [2020-08-21 21:29:57,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:29:57,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:29:57,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:57,154 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-21 21:29:57,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:57,307 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-21 21:29:57,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:29:57,308 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-21 21:29:57,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:57,309 INFO L225 Difference]: With dead ends: 72 [2020-08-21 21:29:57,309 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 21:29:57,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:57,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 21:29:57,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 21:29:57,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 21:29:57,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-21 21:29:57,315 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-21 21:29:57,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:57,316 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-21 21:29:57,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:29:57,316 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-21 21:29:57,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 21:29:57,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:57,317 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:57,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:29:57,318 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:57,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:57,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-21 21:29:57,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:57,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108721021] [2020-08-21 21:29:57,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:57,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,753 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108721021] [2020-08-21 21:29:57,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:29:57,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190304363] [2020-08-21 21:29:57,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:29:57,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:29:57,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:57,756 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-21 21:29:57,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:57,897 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-21 21:29:57,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:29:57,897 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-21 21:29:57,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:57,898 INFO L225 Difference]: With dead ends: 74 [2020-08-21 21:29:57,899 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 21:29:57,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:57,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 21:29:57,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 21:29:57,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 21:29:57,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-21 21:29:57,903 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-21 21:29:57,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:57,903 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-21 21:29:57,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:29:57,903 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-21 21:29:57,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 21:29:57,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:57,905 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:57,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:29:57,905 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:57,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:57,905 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-21 21:29:57,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:57,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640031766] [2020-08-21 21:29:57,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:57,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:58,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,390 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:58,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640031766] [2020-08-21 21:29:58,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:58,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:29:58,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360768186] [2020-08-21 21:29:58,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:29:58,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:58,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:29:58,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:58,393 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-21 21:29:58,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,573 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-21 21:29:58,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:29:58,574 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-21 21:29:58,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,575 INFO L225 Difference]: With dead ends: 76 [2020-08-21 21:29:58,575 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 21:29:58,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:58,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 21:29:58,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 21:29:58,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 21:29:58,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-21 21:29:58,581 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-21 21:29:58,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,581 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-21 21:29:58,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:29:58,581 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-21 21:29:58,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 21:29:58,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,582 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:29:58,583 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,583 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-21 21:29:58,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895635575] [2020-08-21 21:29:58,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:58,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:59,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,079 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:59,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895635575] [2020-08-21 21:29:59,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:59,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:29:59,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108731404] [2020-08-21 21:29:59,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:29:59,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:59,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:29:59,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:59,082 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-21 21:29:59,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:59,249 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-21 21:29:59,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:29:59,250 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-21 21:29:59,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:59,251 INFO L225 Difference]: With dead ends: 78 [2020-08-21 21:29:59,251 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 21:29:59,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:59,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 21:29:59,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 21:29:59,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 21:29:59,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-21 21:29:59,257 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-21 21:29:59,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:59,257 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-21 21:29:59,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:29:59,257 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-21 21:29:59,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 21:29:59,258 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:59,258 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:59,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:29:59,258 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:59,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:59,259 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-21 21:29:59,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:59,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165822235] [2020-08-21 21:29:59,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:59,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:59,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,828 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:59,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165822235] [2020-08-21 21:29:59,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:59,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:29:59,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140545254] [2020-08-21 21:29:59,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:29:59,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:59,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:29:59,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:59,831 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-21 21:30:00,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:00,016 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-21 21:30:00,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:30:00,016 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-21 21:30:00,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:00,017 INFO L225 Difference]: With dead ends: 80 [2020-08-21 21:30:00,018 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 21:30:00,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:00,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 21:30:00,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 21:30:00,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 21:30:00,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-21 21:30:00,023 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-21 21:30:00,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:00,023 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-21 21:30:00,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:30:00,024 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-21 21:30:00,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 21:30:00,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:00,024 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:00,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:30:00,025 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:00,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:00,025 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-21 21:30:00,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:00,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504444179] [2020-08-21 21:30:00,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:00,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:00,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,654 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:00,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504444179] [2020-08-21 21:30:00,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:00,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:30:00,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437993397] [2020-08-21 21:30:00,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:30:00,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:00,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:30:00,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:00,659 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-21 21:30:00,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:00,864 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-21 21:30:00,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:30:00,865 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-21 21:30:00,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:00,866 INFO L225 Difference]: With dead ends: 82 [2020-08-21 21:30:00,866 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 21:30:00,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:00,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 21:30:00,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 21:30:00,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 21:30:00,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-21 21:30:00,875 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-21 21:30:00,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:00,876 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-21 21:30:00,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:30:00,876 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-21 21:30:00,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 21:30:00,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:00,878 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:00,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:30:00,878 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:00,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:00,879 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-21 21:30:00,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:00,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259471988] [2020-08-21 21:30:00,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:00,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:01,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,549 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:01,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259471988] [2020-08-21 21:30:01,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:01,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:30:01,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151549107] [2020-08-21 21:30:01,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:30:01,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:01,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:30:01,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:01,552 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-21 21:30:01,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:01,718 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-21 21:30:01,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:30:01,718 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-21 21:30:01,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:01,719 INFO L225 Difference]: With dead ends: 84 [2020-08-21 21:30:01,719 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 21:30:01,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:01,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 21:30:01,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 21:30:01,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 21:30:01,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-21 21:30:01,725 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-21 21:30:01,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:01,726 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-21 21:30:01,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:30:01,726 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-21 21:30:01,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 21:30:01,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:01,727 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:01,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:30:01,727 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:01,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:01,728 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-21 21:30:01,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:01,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699906352] [2020-08-21 21:30:01,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:01,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:02,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:02,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699906352] [2020-08-21 21:30:02,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:02,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:30:02,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876128668] [2020-08-21 21:30:02,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:30:02,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:02,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:30:02,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:02,578 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-21 21:30:02,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:02,724 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-21 21:30:02,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:30:02,725 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-21 21:30:02,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:02,726 INFO L225 Difference]: With dead ends: 86 [2020-08-21 21:30:02,726 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 21:30:02,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:02,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 21:30:02,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 21:30:02,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 21:30:02,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-21 21:30:02,732 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-21 21:30:02,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:02,732 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-21 21:30:02,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:30:02,733 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-21 21:30:02,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 21:30:02,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:02,734 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:02,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:30:02,734 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:02,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:02,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-21 21:30:02,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:02,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839309449] [2020-08-21 21:30:02,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:02,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:03,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839309449] [2020-08-21 21:30:03,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:03,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:30:03,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480474455] [2020-08-21 21:30:03,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:30:03,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:03,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:30:03,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:03,460 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-21 21:30:03,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:03,668 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-21 21:30:03,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:30:03,669 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-21 21:30:03,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:03,669 INFO L225 Difference]: With dead ends: 88 [2020-08-21 21:30:03,670 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 21:30:03,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:03,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 21:30:03,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 21:30:03,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 21:30:03,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-21 21:30:03,675 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-21 21:30:03,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:03,675 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-21 21:30:03,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:30:03,676 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-21 21:30:03,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 21:30:03,677 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:03,677 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:03,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:30:03,678 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:03,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:03,678 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-21 21:30:03,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:03,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141981285] [2020-08-21 21:30:03,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:03,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:04,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:04,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141981285] [2020-08-21 21:30:04,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:04,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:30:04,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699977708] [2020-08-21 21:30:04,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:30:04,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:04,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:30:04,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:04,421 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-21 21:30:04,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:04,597 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-21 21:30:04,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:30:04,597 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-21 21:30:04,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:04,598 INFO L225 Difference]: With dead ends: 90 [2020-08-21 21:30:04,598 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 21:30:04,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:04,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 21:30:04,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 21:30:04,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 21:30:04,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-21 21:30:04,603 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-21 21:30:04,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:04,604 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-21 21:30:04,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:30:04,604 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-21 21:30:04,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 21:30:04,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:04,605 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:04,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:30:04,605 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:04,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:04,606 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-21 21:30:04,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:04,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162807105] [2020-08-21 21:30:04,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:04,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:05,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:05,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162807105] [2020-08-21 21:30:05,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:05,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:30:05,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087026204] [2020-08-21 21:30:05,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:30:05,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:05,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:30:05,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:05,403 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-21 21:30:05,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:05,537 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-21 21:30:05,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:30:05,537 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-21 21:30:05,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:05,538 INFO L225 Difference]: With dead ends: 92 [2020-08-21 21:30:05,539 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 21:30:05,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:05,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 21:30:05,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 21:30:05,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 21:30:05,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-21 21:30:05,543 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-21 21:30:05,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:05,543 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-21 21:30:05,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:30:05,544 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-21 21:30:05,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 21:30:05,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:05,544 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:05,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:30:05,545 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:05,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:05,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-21 21:30:05,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:05,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450410591] [2020-08-21 21:30:05,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:05,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:06,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:06,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:06,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:06,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450410591] [2020-08-21 21:30:06,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:06,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:30:06,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532336755] [2020-08-21 21:30:06,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:30:06,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:06,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:30:06,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:06,394 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-21 21:30:06,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:06,633 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-21 21:30:06,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:30:06,634 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-21 21:30:06,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:06,635 INFO L225 Difference]: With dead ends: 94 [2020-08-21 21:30:06,635 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 21:30:06,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:06,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 21:30:06,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 21:30:06,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 21:30:06,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-21 21:30:06,639 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-21 21:30:06,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:06,639 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-21 21:30:06,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:30:06,640 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-21 21:30:06,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 21:30:06,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:06,640 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:06,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:30:06,641 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:06,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:06,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-21 21:30:06,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:06,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620370335] [2020-08-21 21:30:06,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:06,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:07,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:07,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620370335] [2020-08-21 21:30:07,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:07,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:30:07,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555730026] [2020-08-21 21:30:07,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:30:07,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:07,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:30:07,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:07,475 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-21 21:30:07,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:07,700 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-21 21:30:07,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:30:07,700 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-21 21:30:07,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:07,701 INFO L225 Difference]: With dead ends: 96 [2020-08-21 21:30:07,702 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 21:30:07,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:07,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 21:30:07,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 21:30:07,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 21:30:07,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-21 21:30:07,706 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-21 21:30:07,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:07,707 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-21 21:30:07,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:30:07,707 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-21 21:30:07,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 21:30:07,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:07,708 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:07,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:30:07,708 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:07,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:07,708 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-21 21:30:07,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:07,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828428064] [2020-08-21 21:30:07,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:07,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:08,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:08,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828428064] [2020-08-21 21:30:08,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:08,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:30:08,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380224681] [2020-08-21 21:30:08,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:30:08,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:08,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:30:08,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:08,599 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-21 21:30:08,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:08,849 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-21 21:30:08,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:30:08,850 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-21 21:30:08,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:08,851 INFO L225 Difference]: With dead ends: 98 [2020-08-21 21:30:08,851 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 21:30:08,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:08,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 21:30:08,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 21:30:08,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 21:30:08,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-21 21:30:08,855 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-21 21:30:08,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:08,856 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-21 21:30:08,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:30:08,856 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-21 21:30:08,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 21:30:08,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:08,857 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:08,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:30:08,857 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:08,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:08,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-21 21:30:08,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:08,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053402423] [2020-08-21 21:30:08,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:08,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:09,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:09,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053402423] [2020-08-21 21:30:09,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:09,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:30:09,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061281845] [2020-08-21 21:30:09,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:30:09,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:09,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:30:09,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:09,809 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-21 21:30:10,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:10,043 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-21 21:30:10,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:30:10,043 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-21 21:30:10,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:10,044 INFO L225 Difference]: With dead ends: 100 [2020-08-21 21:30:10,045 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 21:30:10,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:10,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 21:30:10,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 21:30:10,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 21:30:10,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-21 21:30:10,059 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-21 21:30:10,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:10,059 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-21 21:30:10,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:30:10,060 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-21 21:30:10,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 21:30:10,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:10,061 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:10,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:30:10,061 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:10,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:10,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-21 21:30:10,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:10,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161070747] [2020-08-21 21:30:10,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:10,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:11,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:11,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:11,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:11,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161070747] [2020-08-21 21:30:11,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:11,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 21:30:11,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918318948] [2020-08-21 21:30:11,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 21:30:11,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:11,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 21:30:11,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:11,040 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-21 21:30:11,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:11,276 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-21 21:30:11,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 21:30:11,277 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-21 21:30:11,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:11,278 INFO L225 Difference]: With dead ends: 102 [2020-08-21 21:30:11,278 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 21:30:11,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:11,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 21:30:11,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 21:30:11,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 21:30:11,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-21 21:30:11,283 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-21 21:30:11,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:11,283 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-21 21:30:11,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 21:30:11,283 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-21 21:30:11,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 21:30:11,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:11,284 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:11,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 21:30:11,284 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:11,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:11,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-21 21:30:11,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:11,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197115250] [2020-08-21 21:30:11,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:11,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:12,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:12,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197115250] [2020-08-21 21:30:12,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:12,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 21:30:12,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535134115] [2020-08-21 21:30:12,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 21:30:12,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:12,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 21:30:12,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:12,290 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-21 21:30:12,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:12,536 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-21 21:30:12,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 21:30:12,537 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-21 21:30:12,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:12,538 INFO L225 Difference]: With dead ends: 104 [2020-08-21 21:30:12,538 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 21:30:12,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:12,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 21:30:12,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 21:30:12,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 21:30:12,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-21 21:30:12,544 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-21 21:30:12,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:12,545 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-21 21:30:12,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 21:30:12,545 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-21 21:30:12,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 21:30:12,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:12,546 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:12,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 21:30:12,546 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:12,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:12,546 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-21 21:30:12,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:12,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550187922] [2020-08-21 21:30:12,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:12,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:13,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:13,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:13,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:13,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550187922] [2020-08-21 21:30:13,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:13,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 21:30:13,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216016281] [2020-08-21 21:30:13,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 21:30:13,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:13,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 21:30:13,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:30:13,601 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-21 21:30:13,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:13,769 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-21 21:30:13,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 21:30:13,770 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-21 21:30:13,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:13,771 INFO L225 Difference]: With dead ends: 106 [2020-08-21 21:30:13,771 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 21:30:13,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:30:13,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 21:30:13,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 21:30:13,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 21:30:13,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-21 21:30:13,776 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-21 21:30:13,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:13,777 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-21 21:30:13,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 21:30:13,777 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-21 21:30:13,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 21:30:13,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:13,777 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:13,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 21:30:13,777 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:13,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:13,778 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-21 21:30:13,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:13,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282549777] [2020-08-21 21:30:13,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:13,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:14,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:14,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282549777] [2020-08-21 21:30:14,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:14,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 21:30:14,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552031665] [2020-08-21 21:30:14,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 21:30:14,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:14,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 21:30:14,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:14,876 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-21 21:30:15,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,138 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-21 21:30:15,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 21:30:15,138 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-21 21:30:15,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,139 INFO L225 Difference]: With dead ends: 108 [2020-08-21 21:30:15,139 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 21:30:15,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:15,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 21:30:15,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 21:30:15,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 21:30:15,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-21 21:30:15,145 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-21 21:30:15,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,145 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-21 21:30:15,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 21:30:15,145 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-21 21:30:15,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 21:30:15,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,146 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 21:30:15,146 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,147 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-21 21:30:15,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931369833] [2020-08-21 21:30:15,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:16,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931369833] [2020-08-21 21:30:16,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:16,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 21:30:16,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134112765] [2020-08-21 21:30:16,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 21:30:16,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:16,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 21:30:16,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:16,270 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-21 21:30:16,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,484 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-21 21:30:16,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 21:30:16,484 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-21 21:30:16,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,485 INFO L225 Difference]: With dead ends: 110 [2020-08-21 21:30:16,485 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 21:30:16,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:16,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 21:30:16,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 21:30:16,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 21:30:16,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-21 21:30:16,489 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-21 21:30:16,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,490 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-21 21:30:16,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 21:30:16,490 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-21 21:30:16,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 21:30:16,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,491 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 21:30:16,491 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,491 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-21 21:30:16,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936145641] [2020-08-21 21:30:16,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:17,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:17,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936145641] [2020-08-21 21:30:17,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:17,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 21:30:17,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108298983] [2020-08-21 21:30:17,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 21:30:17,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:17,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 21:30:17,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:17,668 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-21 21:30:17,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,854 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-21 21:30:17,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 21:30:17,855 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-21 21:30:17,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,856 INFO L225 Difference]: With dead ends: 112 [2020-08-21 21:30:17,856 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 21:30:17,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:17,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 21:30:17,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 21:30:17,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 21:30:17,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-21 21:30:17,861 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-21 21:30:17,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,861 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-21 21:30:17,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 21:30:17,861 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-21 21:30:17,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 21:30:17,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,862 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 21:30:17,863 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,863 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-21 21:30:17,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984010071] [2020-08-21 21:30:17,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984010071] [2020-08-21 21:30:19,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:19,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 21:30:19,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044554927] [2020-08-21 21:30:19,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 21:30:19,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 21:30:19,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 21:30:19,099 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-21 21:30:19,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,269 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-21 21:30:19,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 21:30:19,269 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-21 21:30:19,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,271 INFO L225 Difference]: With dead ends: 114 [2020-08-21 21:30:19,271 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 21:30:19,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 21:30:19,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 21:30:19,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 21:30:19,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 21:30:19,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-21 21:30:19,276 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-21 21:30:19,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,276 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-21 21:30:19,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 21:30:19,276 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-21 21:30:19,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 21:30:19,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,277 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 21:30:19,278 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-21 21:30:19,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510782678] [2020-08-21 21:30:19,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510782678] [2020-08-21 21:30:20,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 21:30:20,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196133692] [2020-08-21 21:30:20,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 21:30:20,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 21:30:20,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 21:30:20,574 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-21 21:30:20,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,752 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-21 21:30:20,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 21:30:20,753 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-21 21:30:20,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,754 INFO L225 Difference]: With dead ends: 116 [2020-08-21 21:30:20,754 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 21:30:20,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 21:30:20,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 21:30:20,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 21:30:20,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 21:30:20,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-21 21:30:20,760 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-21 21:30:20,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,760 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-21 21:30:20,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 21:30:20,760 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-21 21:30:20,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 21:30:20,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,761 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 21:30:20,761 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-21 21:30:20,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886684867] [2020-08-21 21:30:20,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:22,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886684867] [2020-08-21 21:30:22,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-21 21:30:22,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954460168] [2020-08-21 21:30:22,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-21 21:30:22,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-21 21:30:22,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 21:30:22,190 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-21 21:30:22,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:22,380 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-21 21:30:22,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-21 21:30:22,381 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-21 21:30:22,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:22,382 INFO L225 Difference]: With dead ends: 118 [2020-08-21 21:30:22,382 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 21:30:22,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 21:30:22,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 21:30:22,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-21 21:30:22,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-21 21:30:22,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-21 21:30:22,387 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-21 21:30:22,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:22,388 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-21 21:30:22,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-21 21:30:22,388 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-21 21:30:22,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 21:30:22,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:22,389 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:22,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 21:30:22,389 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:22,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:22,389 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-21 21:30:22,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:22,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494118321] [2020-08-21 21:30:22,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:22,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:23,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:23,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494118321] [2020-08-21 21:30:23,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:23,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-21 21:30:23,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528219592] [2020-08-21 21:30:23,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-21 21:30:23,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:23,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-21 21:30:23,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 21:30:23,798 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-21 21:30:24,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:24,037 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-21 21:30:24,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-21 21:30:24,038 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-21 21:30:24,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:24,039 INFO L225 Difference]: With dead ends: 120 [2020-08-21 21:30:24,040 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 21:30:24,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 21:30:24,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 21:30:24,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-21 21:30:24,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 21:30:24,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-21 21:30:24,044 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-21 21:30:24,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:24,044 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-21 21:30:24,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-21 21:30:24,045 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-21 21:30:24,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 21:30:24,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:24,045 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:24,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 21:30:24,046 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:24,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:24,046 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-21 21:30:24,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:24,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179944535] [2020-08-21 21:30:24,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:24,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:25,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,511 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:25,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179944535] [2020-08-21 21:30:25,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:25,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-21 21:30:25,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929457609] [2020-08-21 21:30:25,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-21 21:30:25,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:25,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-21 21:30:25,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 21:30:25,513 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-21 21:30:25,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:25,822 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-21 21:30:25,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-21 21:30:25,822 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-21 21:30:25,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:25,824 INFO L225 Difference]: With dead ends: 122 [2020-08-21 21:30:25,824 INFO L226 Difference]: Without dead ends: 116 [2020-08-21 21:30:25,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 21:30:25,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-21 21:30:25,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-21 21:30:25,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 21:30:25,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-21 21:30:25,829 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-21 21:30:25,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:25,829 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-21 21:30:25,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-21 21:30:25,829 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-21 21:30:25,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 21:30:25,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:25,830 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:25,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 21:30:25,830 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:25,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:25,831 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-21 21:30:25,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:25,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047776273] [2020-08-21 21:30:25,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:25,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:27,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:27,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:27,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:27,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047776273] [2020-08-21 21:30:27,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:27,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-21 21:30:27,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721797658] [2020-08-21 21:30:27,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-21 21:30:27,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:27,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-21 21:30:27,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 21:30:27,388 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-21 21:30:27,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:27,701 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-21 21:30:27,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-21 21:30:27,701 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-21 21:30:27,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:27,703 INFO L225 Difference]: With dead ends: 124 [2020-08-21 21:30:27,703 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 21:30:27,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 21:30:27,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 21:30:27,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-21 21:30:27,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-21 21:30:27,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-21 21:30:27,707 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-21 21:30:27,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:27,708 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-21 21:30:27,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-21 21:30:27,708 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-21 21:30:27,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 21:30:27,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:27,709 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:27,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 21:30:27,709 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:27,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:27,709 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-21 21:30:27,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:27,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424116414] [2020-08-21 21:30:27,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:27,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:29,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:29,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424116414] [2020-08-21 21:30:29,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:29,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-21 21:30:29,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765839175] [2020-08-21 21:30:29,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-21 21:30:29,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:29,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-21 21:30:29,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 21:30:29,334 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-21 21:30:29,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:29,663 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-21 21:30:29,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-21 21:30:29,663 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-21 21:30:29,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:29,665 INFO L225 Difference]: With dead ends: 126 [2020-08-21 21:30:29,665 INFO L226 Difference]: Without dead ends: 120 [2020-08-21 21:30:29,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 21:30:29,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-21 21:30:29,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-21 21:30:29,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 21:30:29,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-21 21:30:29,670 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-21 21:30:29,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:29,671 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-21 21:30:29,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-21 21:30:29,671 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-21 21:30:29,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 21:30:29,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:29,672 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:29,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 21:30:29,672 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:29,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:29,673 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-21 21:30:29,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:29,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706669165] [2020-08-21 21:30:29,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:29,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:31,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:31,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706669165] [2020-08-21 21:30:31,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:31,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-21 21:30:31,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551403061] [2020-08-21 21:30:31,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-21 21:30:31,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:31,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-21 21:30:31,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 21:30:31,323 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-21 21:30:31,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:31,577 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-21 21:30:31,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-21 21:30:31,578 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-21 21:30:31,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:31,579 INFO L225 Difference]: With dead ends: 128 [2020-08-21 21:30:31,579 INFO L226 Difference]: Without dead ends: 122 [2020-08-21 21:30:31,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 21:30:31,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-21 21:30:31,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-21 21:30:31,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 21:30:31,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-21 21:30:31,584 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-21 21:30:31,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:31,584 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-21 21:30:31,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-21 21:30:31,584 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-21 21:30:31,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 21:30:31,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:31,585 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:31,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 21:30:31,586 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:31,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:31,586 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-21 21:30:31,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:31,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293641801] [2020-08-21 21:30:31,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:31,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:33,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:33,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:33,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:33,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293641801] [2020-08-21 21:30:33,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:33,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-21 21:30:33,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943426215] [2020-08-21 21:30:33,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-21 21:30:33,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:33,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-21 21:30:33,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 21:30:33,366 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-21 21:30:33,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:33,693 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-21 21:30:33,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-21 21:30:33,694 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-21 21:30:33,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:33,695 INFO L225 Difference]: With dead ends: 130 [2020-08-21 21:30:33,695 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 21:30:33,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 21:30:33,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 21:30:33,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-21 21:30:33,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-21 21:30:33,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-21 21:30:33,700 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-21 21:30:33,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:33,700 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-21 21:30:33,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-21 21:30:33,700 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-21 21:30:33,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 21:30:33,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:33,701 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:33,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 21:30:33,701 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:33,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:33,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-21 21:30:33,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:33,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527302882] [2020-08-21 21:30:33,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:35,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:35,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:35,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527302882] [2020-08-21 21:30:35,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:35,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-21 21:30:35,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467612564] [2020-08-21 21:30:35,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-21 21:30:35,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:35,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-21 21:30:35,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 21:30:35,508 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-21 21:30:35,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:35,732 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-21 21:30:35,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-21 21:30:35,733 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-21 21:30:35,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:35,734 INFO L225 Difference]: With dead ends: 132 [2020-08-21 21:30:35,734 INFO L226 Difference]: Without dead ends: 126 [2020-08-21 21:30:35,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 21:30:35,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-21 21:30:35,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-21 21:30:35,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 21:30:35,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-21 21:30:35,738 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-21 21:30:35,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:35,738 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-21 21:30:35,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-21 21:30:35,739 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-21 21:30:35,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 21:30:35,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:35,740 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:35,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 21:30:35,740 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:35,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:35,740 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-21 21:30:35,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:35,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796271180] [2020-08-21 21:30:35,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:37,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:37,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796271180] [2020-08-21 21:30:37,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:37,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-21 21:30:37,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792311073] [2020-08-21 21:30:37,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-21 21:30:37,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:37,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-21 21:30:37,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 21:30:37,603 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-21 21:30:37,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:37,975 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-21 21:30:37,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-21 21:30:37,976 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-21 21:30:37,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:37,977 INFO L225 Difference]: With dead ends: 134 [2020-08-21 21:30:37,977 INFO L226 Difference]: Without dead ends: 128 [2020-08-21 21:30:37,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 21:30:37,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-21 21:30:37,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-21 21:30:37,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 21:30:37,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-21 21:30:37,981 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-21 21:30:37,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:37,982 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-21 21:30:37,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-21 21:30:37,982 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-21 21:30:37,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 21:30:37,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:37,983 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:37,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 21:30:37,983 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:37,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:37,983 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-21 21:30:37,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:37,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257420929] [2020-08-21 21:30:37,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:38,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:39,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:39,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:39,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:39,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257420929] [2020-08-21 21:30:39,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:39,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-21 21:30:39,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368148219] [2020-08-21 21:30:39,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-21 21:30:39,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:39,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-21 21:30:39,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 21:30:39,860 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-21 21:30:40,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:40,117 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-21 21:30:40,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-21 21:30:40,117 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-21 21:30:40,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:40,118 INFO L225 Difference]: With dead ends: 136 [2020-08-21 21:30:40,118 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 21:30:40,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 21:30:40,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 21:30:40,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-21 21:30:40,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-21 21:30:40,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-21 21:30:40,123 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-21 21:30:40,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:40,124 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-21 21:30:40,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-21 21:30:40,124 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-21 21:30:40,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 21:30:40,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:40,125 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:40,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 21:30:40,125 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:40,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:40,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-21 21:30:40,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:40,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646655574] [2020-08-21 21:30:40,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:40,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:42,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,124 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:42,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646655574] [2020-08-21 21:30:42,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:42,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-21 21:30:42,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50334918] [2020-08-21 21:30:42,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-21 21:30:42,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:42,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-21 21:30:42,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 21:30:42,126 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-21 21:30:42,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:42,486 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-21 21:30:42,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-21 21:30:42,486 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-21 21:30:42,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:42,488 INFO L225 Difference]: With dead ends: 138 [2020-08-21 21:30:42,488 INFO L226 Difference]: Without dead ends: 132 [2020-08-21 21:30:42,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 21:30:42,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-21 21:30:42,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-21 21:30:42,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-21 21:30:42,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-21 21:30:42,491 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-21 21:30:42,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:42,492 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-21 21:30:42,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-21 21:30:42,492 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-21 21:30:42,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-21 21:30:42,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:42,492 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:42,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-21 21:30:42,493 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:42,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:42,493 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-21 21:30:42,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:42,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087006573] [2020-08-21 21:30:42,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:42,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:44,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:44,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:44,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:44,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087006573] [2020-08-21 21:30:44,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:44,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-08-21 21:30:44,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905068056] [2020-08-21 21:30:44,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-08-21 21:30:44,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:44,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-08-21 21:30:44,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2020-08-21 21:30:44,528 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 63 states. [2020-08-21 21:30:44,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:44,881 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2020-08-21 21:30:44,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-08-21 21:30:44,882 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 130 [2020-08-21 21:30:44,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:44,883 INFO L225 Difference]: With dead ends: 140 [2020-08-21 21:30:44,884 INFO L226 Difference]: Without dead ends: 134 [2020-08-21 21:30:44,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2020-08-21 21:30:44,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-08-21 21:30:44,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2020-08-21 21:30:44,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 21:30:44,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2020-08-21 21:30:44,887 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 130 [2020-08-21 21:30:44,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:44,887 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2020-08-21 21:30:44,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-08-21 21:30:44,887 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2020-08-21 21:30:44,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 21:30:44,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:44,888 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:44,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-08-21 21:30:44,888 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:44,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:44,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1036637461, now seen corresponding path program 60 times [2020-08-21 21:30:44,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:44,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043128031] [2020-08-21 21:30:44,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:44,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat