/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:23:50,426 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:23:50,429 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:23:50,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:23:50,468 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:23:50,475 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:23:50,479 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:23:50,482 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:23:50,486 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:23:50,488 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:23:50,489 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:23:50,490 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:23:50,490 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:23:50,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:23:50,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:23:50,497 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:23:50,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:23:50,499 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:23:50,500 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:23:50,509 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:23:50,511 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:23:50,512 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:23:50,513 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:23:50,514 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:23:50,525 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 16:23:50,525 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 16:23:50,525 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 16:23:50,526 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 16:23:50,526 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 16:23:50,529 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 16:23:50,530 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 16:23:50,530 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 16:23:50,531 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 16:23:50,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 16:23:50,533 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 16:23:50,534 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 16:23:50,534 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 16:23:50,535 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 16:23:50,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:23:50,535 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:23:50,536 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:23:50,537 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 16:23:50,575 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:23:50,575 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:23:50,577 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:23:50,577 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:23:50,578 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:23:50,578 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:23:50,578 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:23:50,578 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:23:50,578 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:23:50,579 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:23:50,579 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:23:50,580 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:23:50,580 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:23:50,580 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:23:50,580 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:23:50,581 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:23:50,581 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:23:50,581 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:23:50,581 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:23:50,581 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:23:50,582 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:23:50,582 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:23:50,582 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:23:50,582 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:23:50,582 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:23:50,583 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:23:50,583 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:23:50,583 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:23:50,583 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:23:50,583 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 [2020-08-18 16:23:50,892 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:23:50,907 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:23:50,911 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:23:50,912 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:23:50,912 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:23:50,913 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 16:23:50,972 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11f7c4376/89b1897709444366b9b2b5b1fe8310d0/FLAGdd6025d06 [2020-08-18 16:23:51,458 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:23:51,459 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 16:23:51,465 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11f7c4376/89b1897709444366b9b2b5b1fe8310d0/FLAGdd6025d06 [2020-08-18 16:23:51,856 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11f7c4376/89b1897709444366b9b2b5b1fe8310d0 [2020-08-18 16:23:51,864 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:23:51,866 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:23:51,867 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:51,867 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:23:51,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:23:51,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:51" (1/1) ... [2020-08-18 16:23:51,875 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c230f23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:51, skipping insertion in model container [2020-08-18 16:23:51,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:51" (1/1) ... [2020-08-18 16:23:51,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:23:51,901 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:23:52,090 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:52,138 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:23:52,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:52,300 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:23:52,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52 WrapperNode [2020-08-18 16:23:52,300 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:52,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:23:52,301 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:23:52,301 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:23:52,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,322 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,322 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,330 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,337 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,338 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... [2020-08-18 16:23:52,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:23:52,341 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:23:52,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:23:52,342 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:23:52,342 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:23:52,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:23:52,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:23:52,404 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:23:52,405 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 16:23:52,406 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 16:23:52,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:23:52,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 16:23:52,665 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:23:52,666 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 16:23:52,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:52 BoogieIcfgContainer [2020-08-18 16:23:52,671 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:23:52,672 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:23:52,672 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:23:52,675 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:23:52,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:23:51" (1/3) ... [2020-08-18 16:23:52,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ca87dc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:52, skipping insertion in model container [2020-08-18 16:23:52,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:52" (2/3) ... [2020-08-18 16:23:52,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ca87dc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:52, skipping insertion in model container [2020-08-18 16:23:52,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:52" (3/3) ... [2020-08-18 16:23:52,679 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 16:23:52,694 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:23:52,703 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:23:52,726 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:23:52,772 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:23:52,772 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:23:52,772 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:23:52,772 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:23:52,773 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:23:52,773 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:23:52,773 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:23:52,773 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:23:52,814 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 16:23:52,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 16:23:52,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:52,822 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:52,822 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:52,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:52,829 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 16:23:52,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:52,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1200039262] [2020-08-18 16:23:52,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:52,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:53,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1200039262] [2020-08-18 16:23:53,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:53,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 16:23:53,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633843454] [2020-08-18 16:23:53,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 16:23:53,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 16:23:53,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:23:53,063 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 16:23:53,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:53,170 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 16:23:53,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:23:53,172 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 16:23:53,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:53,181 INFO L225 Difference]: With dead ends: 42 [2020-08-18 16:23:53,182 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 16:23:53,185 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 [2020-08-18 16:23:53,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 16:23:53,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 16:23:53,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:23:53,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 16:23:53,217 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 16:23:53,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:53,218 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 16:23:53,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 16:23:53,218 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 16:23:53,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 16:23:53,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:53,219 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:53,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:23:53,219 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:53,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:53,220 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 16:23:53,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:53,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1387560203] [2020-08-18 16:23:53,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:53,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:53,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:53,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1387560203] [2020-08-18 16:23:53,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:53,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:23:53,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005585094] [2020-08-18 16:23:53,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:23:53,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:23:53,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:23:53,326 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 16:23:53,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:53,432 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 16:23:53,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:23:53,432 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 16:23:53,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:53,434 INFO L225 Difference]: With dead ends: 36 [2020-08-18 16:23:53,434 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 16:23:53,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:53,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 16:23:53,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 16:23:53,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 16:23:53,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 16:23:53,449 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 16:23:53,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:53,449 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 16:23:53,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:23:53,450 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 16:23:53,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:23:53,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:53,450 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:53,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:23:53,451 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:53,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:53,452 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 16:23:53,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:53,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740621151] [2020-08-18 16:23:53,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:53,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:53,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:53,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740621151] [2020-08-18 16:23:53,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:53,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:23:53,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601032619] [2020-08-18 16:23:53,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:23:53,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:23:53,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:23:53,528 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 16:23:53,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:53,632 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 16:23:53,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:23:53,633 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 16:23:53,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:53,634 INFO L225 Difference]: With dead ends: 40 [2020-08-18 16:23:53,634 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:23:53,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:53,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:23:53,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 16:23:53,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:23:53,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 16:23:53,641 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 16:23:53,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:53,642 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 16:23:53,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:23:53,642 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 16:23:53,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 16:23:53,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:53,643 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:53,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:23:53,644 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:53,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:53,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 16:23:53,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:53,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244979550] [2020-08-18 16:23:53,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:53,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:53,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:53,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244979550] [2020-08-18 16:23:53,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:53,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:23:53,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318930295] [2020-08-18 16:23:53,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:23:53,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:23:53,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:23:53,756 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 16:23:53,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:53,840 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 16:23:53,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:23:53,841 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 16:23:53,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:53,842 INFO L225 Difference]: With dead ends: 31 [2020-08-18 16:23:53,842 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 16:23:53,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:53,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 16:23:53,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 16:23:53,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 16:23:53,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 16:23:53,849 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 16:23:53,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:53,849 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 16:23:53,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:23:53,850 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 16:23:53,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 16:23:53,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:53,851 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:53,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:23:53,851 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:53,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:53,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 16:23:53,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:53,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872106020] [2020-08-18 16:23:53,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:53,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:53,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,965 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:53,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872106020] [2020-08-18 16:23:53,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:53,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 16:23:53,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748987903] [2020-08-18 16:23:53,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:23:53,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:23:53,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:53,968 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 16:23:54,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:54,057 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 16:23:54,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:23:54,058 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 16:23:54,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:54,059 INFO L225 Difference]: With dead ends: 34 [2020-08-18 16:23:54,059 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 16:23:54,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:54,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 16:23:54,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 16:23:54,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 16:23:54,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 16:23:54,066 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 16:23:54,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:54,067 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 16:23:54,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:23:54,067 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 16:23:54,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 16:23:54,068 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:54,068 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:54,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:23:54,069 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:54,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:54,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 16:23:54,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:54,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725513591] [2020-08-18 16:23:54,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:54,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:54,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,251 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:54,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725513591] [2020-08-18 16:23:54,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:54,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:23:54,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085920839] [2020-08-18 16:23:54,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:23:54,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:54,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:23:54,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:54,256 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 16:23:54,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:54,360 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 16:23:54,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:23:54,361 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 16:23:54,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:54,362 INFO L225 Difference]: With dead ends: 38 [2020-08-18 16:23:54,364 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 16:23:54,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:23:54,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 16:23:54,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 16:23:54,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 16:23:54,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 16:23:54,370 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 16:23:54,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:54,371 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 16:23:54,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:23:54,371 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 16:23:54,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 16:23:54,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:54,372 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:54,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:23:54,372 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:54,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:54,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 16:23:54,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:54,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842754534] [2020-08-18 16:23:54,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:54,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:54,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,501 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:54,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842754534] [2020-08-18 16:23:54,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:54,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:23:54,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623299319] [2020-08-18 16:23:54,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:23:54,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:54,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:23:54,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:23:54,504 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 16:23:54,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:54,609 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 16:23:54,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:23:54,609 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 16:23:54,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:54,610 INFO L225 Difference]: With dead ends: 42 [2020-08-18 16:23:54,610 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 16:23:54,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:23:54,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 16:23:54,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 16:23:54,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 16:23:54,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 16:23:54,617 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 16:23:54,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:54,618 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 16:23:54,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:23:54,618 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 16:23:54,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 16:23:54,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:54,619 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:54,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:23:54,620 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:54,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:54,620 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 16:23:54,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:54,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395693494] [2020-08-18 16:23:54,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:54,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:54,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,763 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:54,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395693494] [2020-08-18 16:23:54,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:54,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:23:54,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739575373] [2020-08-18 16:23:54,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:23:54,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:54,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:23:54,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:23:54,767 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 16:23:54,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:54,938 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 16:23:54,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:23:54,939 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 16:23:54,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:54,940 INFO L225 Difference]: With dead ends: 46 [2020-08-18 16:23:54,940 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 16:23:54,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:23:54,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 16:23:54,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 16:23:54,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 16:23:54,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 16:23:54,946 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 16:23:54,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:54,946 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 16:23:54,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:23:54,947 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 16:23:54,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 16:23:54,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:54,948 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:54,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:23:54,948 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:54,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:54,949 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 16:23:54,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:54,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153599308] [2020-08-18 16:23:54,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:54,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:55,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,098 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:55,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153599308] [2020-08-18 16:23:55,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:55,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:23:55,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086133117] [2020-08-18 16:23:55,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:23:55,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:55,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:23:55,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:23:55,101 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 16:23:55,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:55,246 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 16:23:55,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:23:55,246 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 16:23:55,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:55,247 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:23:55,247 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:23:55,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:23:55,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:23:55,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 16:23:55,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:23:55,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 16:23:55,255 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 16:23:55,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:55,255 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 16:23:55,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:23:55,255 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 16:23:55,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 16:23:55,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:55,256 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:55,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:23:55,257 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:55,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:55,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 16:23:55,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:55,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673397840] [2020-08-18 16:23:55,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:55,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:55,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,442 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:55,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673397840] [2020-08-18 16:23:55,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:55,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:23:55,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574243327] [2020-08-18 16:23:55,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:23:55,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:55,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:23:55,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:23:55,444 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 16:23:55,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:55,613 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 16:23:55,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:23:55,613 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 16:23:55,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:55,614 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:23:55,614 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 16:23:55,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:55,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 16:23:55,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 16:23:55,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 16:23:55,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 16:23:55,621 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 16:23:55,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:55,622 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 16:23:55,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:23:55,622 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 16:23:55,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 16:23:55,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:55,623 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:55,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:23:55,624 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:55,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:55,624 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 16:23:55,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:55,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976069475] [2020-08-18 16:23:55,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:55,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:55,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,803 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:55,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976069475] [2020-08-18 16:23:55,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:55,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:23:55,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831513475] [2020-08-18 16:23:55,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:23:55,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:55,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:23:55,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:55,805 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 16:23:56,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:56,007 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 16:23:56,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:23:56,007 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 16:23:56,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:56,008 INFO L225 Difference]: With dead ends: 58 [2020-08-18 16:23:56,008 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 16:23:56,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:23:56,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 16:23:56,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 16:23:56,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 16:23:56,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 16:23:56,015 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 16:23:56,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:56,015 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 16:23:56,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:23:56,016 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 16:23:56,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 16:23:56,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:56,017 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:56,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:23:56,017 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:56,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:56,017 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 16:23:56,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:56,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698085464] [2020-08-18 16:23:56,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:56,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:56,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,199 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:56,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698085464] [2020-08-18 16:23:56,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:56,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:23:56,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332572151] [2020-08-18 16:23:56,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:23:56,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:56,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:23:56,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:23:56,201 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 16:23:56,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:56,425 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 16:23:56,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:23:56,426 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 16:23:56,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:56,429 INFO L225 Difference]: With dead ends: 62 [2020-08-18 16:23:56,429 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 16:23:56,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:23:56,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 16:23:56,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 16:23:56,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 16:23:56,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 16:23:56,441 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 16:23:56,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:56,442 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 16:23:56,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:23:56,442 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 16:23:56,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 16:23:56,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:56,443 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:56,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:23:56,443 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:56,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:56,447 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 16:23:56,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:56,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034954751] [2020-08-18 16:23:56,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:56,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:56,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,728 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:56,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034954751] [2020-08-18 16:23:56,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:56,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:23:56,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115435951] [2020-08-18 16:23:56,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:23:56,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:56,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:23:56,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:23:56,733 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 16:23:57,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:57,009 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 16:23:57,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:23:57,010 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 16:23:57,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:57,011 INFO L225 Difference]: With dead ends: 66 [2020-08-18 16:23:57,011 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 16:23:57,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:23:57,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 16:23:57,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 16:23:57,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 16:23:57,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 16:23:57,018 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 16:23:57,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:57,018 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 16:23:57,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:23:57,018 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 16:23:57,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 16:23:57,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:57,019 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:57,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:23:57,020 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:57,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:57,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 16:23:57,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:57,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249657206] [2020-08-18 16:23:57,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:57,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:57,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,265 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:57,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249657206] [2020-08-18 16:23:57,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:57,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:23:57,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577294427] [2020-08-18 16:23:57,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:23:57,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:57,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:23:57,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:23:57,269 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 16:23:57,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:57,584 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 16:23:57,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:23:57,584 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 16:23:57,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:57,585 INFO L225 Difference]: With dead ends: 70 [2020-08-18 16:23:57,585 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 16:23:57,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:23:57,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 16:23:57,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 16:23:57,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 16:23:57,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 16:23:57,592 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 16:23:57,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:57,592 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 16:23:57,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:23:57,593 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 16:23:57,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 16:23:57,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:57,594 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:57,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:23:57,594 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:57,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:57,595 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 16:23:57,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:57,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589527664] [2020-08-18 16:23:57,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:57,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:57,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,854 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:57,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589527664] [2020-08-18 16:23:57,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:57,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:23:57,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201908033] [2020-08-18 16:23:57,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:23:57,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:57,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:23:57,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:23:57,856 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 16:23:58,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:58,284 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 16:23:58,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:23:58,285 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 16:23:58,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:58,286 INFO L225 Difference]: With dead ends: 74 [2020-08-18 16:23:58,286 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 16:23:58,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:23:58,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 16:23:58,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 16:23:58,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 16:23:58,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 16:23:58,295 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 16:23:58,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:58,296 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 16:23:58,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:23:58,296 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 16:23:58,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 16:23:58,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:58,297 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:58,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:23:58,297 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:58,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:58,298 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 16:23:58,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:58,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863993997] [2020-08-18 16:23:58,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:58,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:58,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:58,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:58,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863993997] [2020-08-18 16:23:58,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:58,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:23:58,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484960730] [2020-08-18 16:23:58,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:23:58,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:58,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:23:58,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:23:58,580 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 16:23:59,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:59,010 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 16:23:59,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:23:59,011 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 16:23:59,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:59,012 INFO L225 Difference]: With dead ends: 78 [2020-08-18 16:23:59,012 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 16:23:59,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:23:59,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 16:23:59,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 16:23:59,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 16:23:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 16:23:59,019 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 16:23:59,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:59,019 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 16:23:59,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:23:59,020 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 16:23:59,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 16:23:59,020 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:59,020 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:59,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:23:59,021 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:59,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:59,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 16:23:59,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:59,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630376769] [2020-08-18 16:23:59,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:59,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:59,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:59,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:59,322 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:59,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630376769] [2020-08-18 16:23:59,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:59,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:23:59,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609806094] [2020-08-18 16:23:59,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:23:59,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:59,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:23:59,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:23:59,326 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 16:23:59,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:59,763 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 16:23:59,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:23:59,763 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 16:23:59,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:59,764 INFO L225 Difference]: With dead ends: 82 [2020-08-18 16:23:59,764 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 16:23:59,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:23:59,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 16:23:59,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 16:23:59,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 16:23:59,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 16:23:59,770 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 16:23:59,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:59,771 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 16:23:59,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:23:59,771 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 16:23:59,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 16:23:59,772 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:59,772 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:59,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:23:59,772 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:59,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:59,773 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 16:23:59,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:59,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442779065] [2020-08-18 16:23:59,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:59,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:00,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:00,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:00,136 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:00,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442779065] [2020-08-18 16:24:00,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:00,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:24:00,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109952944] [2020-08-18 16:24:00,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:24:00,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:00,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:24:00,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:00,138 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 16:24:00,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:00,663 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 16:24:00,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:24:00,664 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 16:24:00,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:00,665 INFO L225 Difference]: With dead ends: 86 [2020-08-18 16:24:00,665 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:24:00,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:00,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:24:00,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 16:24:00,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:24:00,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 16:24:00,671 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 16:24:00,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:00,672 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 16:24:00,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:24:00,672 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 16:24:00,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 16:24:00,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:00,673 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:00,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:24:00,673 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:00,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:00,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 16:24:00,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:00,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879278941] [2020-08-18 16:24:00,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:00,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:01,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,017 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:01,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879278941] [2020-08-18 16:24:01,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:01,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:24:01,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459201527] [2020-08-18 16:24:01,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:24:01,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:01,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:24:01,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:01,023 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 16:24:01,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:01,531 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 16:24:01,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:24:01,532 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 16:24:01,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:01,533 INFO L225 Difference]: With dead ends: 90 [2020-08-18 16:24:01,533 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 16:24:01,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:01,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 16:24:01,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 16:24:01,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 16:24:01,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 16:24:01,542 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 16:24:01,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:01,543 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 16:24:01,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:24:01,543 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 16:24:01,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 16:24:01,543 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:01,543 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:01,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:24:01,544 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:01,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:01,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 16:24:01,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:01,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685605846] [2020-08-18 16:24:01,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:01,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:01,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,982 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:01,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685605846] [2020-08-18 16:24:01,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:01,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:24:01,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9361952] [2020-08-18 16:24:01,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:24:01,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:01,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:24:01,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:01,985 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 16:24:02,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:02,574 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 16:24:02,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:24:02,575 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 16:24:02,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:02,576 INFO L225 Difference]: With dead ends: 94 [2020-08-18 16:24:02,576 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 16:24:02,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:02,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 16:24:02,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 16:24:02,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 16:24:02,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 16:24:02,583 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 16:24:02,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:02,583 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 16:24:02,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:24:02,584 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 16:24:02,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 16:24:02,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:02,585 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:02,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:24:02,585 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:02,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:02,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 16:24:02,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:02,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712740865] [2020-08-18 16:24:02,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:02,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:02,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:02,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:02,995 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:02,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712740865] [2020-08-18 16:24:02,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:02,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:24:02,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630471909] [2020-08-18 16:24:02,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:24:02,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:02,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:24:02,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:02,997 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 16:24:03,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:03,634 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 16:24:03,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:24:03,635 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 16:24:03,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:03,636 INFO L225 Difference]: With dead ends: 98 [2020-08-18 16:24:03,636 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 16:24:03,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:03,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 16:24:03,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 16:24:03,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 16:24:03,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 16:24:03,641 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 16:24:03,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:03,641 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 16:24:03,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:24:03,642 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 16:24:03,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 16:24:03,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:03,643 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:03,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:24:03,643 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:03,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:03,643 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 16:24:03,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:03,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029642923] [2020-08-18 16:24:03,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:03,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:04,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:04,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:04,092 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:04,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029642923] [2020-08-18 16:24:04,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:04,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:24:04,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717262020] [2020-08-18 16:24:04,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:24:04,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:04,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:24:04,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:04,094 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 16:24:04,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:04,719 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 16:24:04,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:24:04,724 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 16:24:04,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:04,725 INFO L225 Difference]: With dead ends: 102 [2020-08-18 16:24:04,725 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 16:24:04,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:04,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 16:24:04,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 16:24:04,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 16:24:04,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 16:24:04,731 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 16:24:04,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:04,731 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 16:24:04,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:24:04,731 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 16:24:04,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 16:24:04,732 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:04,732 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:04,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:24:04,733 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:04,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:04,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 16:24:04,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:04,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329475891] [2020-08-18 16:24:04,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:04,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:05,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:05,230 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:05,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329475891] [2020-08-18 16:24:05,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:05,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:24:05,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219746858] [2020-08-18 16:24:05,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:24:05,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:05,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:24:05,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:05,236 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 16:24:06,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:06,010 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 16:24:06,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:24:06,018 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 16:24:06,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:06,019 INFO L225 Difference]: With dead ends: 106 [2020-08-18 16:24:06,019 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 16:24:06,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:06,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 16:24:06,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 16:24:06,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 16:24:06,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 16:24:06,026 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 16:24:06,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:06,026 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 16:24:06,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:24:06,027 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 16:24:06,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 16:24:06,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:06,027 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:06,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:24:06,028 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:06,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:06,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 16:24:06,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:06,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145653441] [2020-08-18 16:24:06,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:06,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:06,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:06,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:06,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145653441] [2020-08-18 16:24:06,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:06,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:24:06,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006348888] [2020-08-18 16:24:06,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:24:06,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:06,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:24:06,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:06,542 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 16:24:07,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:07,368 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 16:24:07,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:24:07,370 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 16:24:07,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:07,371 INFO L225 Difference]: With dead ends: 110 [2020-08-18 16:24:07,371 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 16:24:07,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:07,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 16:24:07,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 16:24:07,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 16:24:07,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 16:24:07,377 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 16:24:07,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:07,377 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 16:24:07,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:24:07,378 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 16:24:07,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 16:24:07,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:07,378 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:07,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:24:07,379 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:07,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:07,379 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 16:24:07,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:07,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944712674] [2020-08-18 16:24:07,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:07,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:07,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:07,918 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:07,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944712674] [2020-08-18 16:24:07,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:07,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:24:07,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326454172] [2020-08-18 16:24:07,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:24:07,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:07,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:24:07,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:07,920 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 16:24:08,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:08,791 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 16:24:08,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:24:08,791 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 16:24:08,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:08,792 INFO L225 Difference]: With dead ends: 114 [2020-08-18 16:24:08,792 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 16:24:08,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:08,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 16:24:08,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 16:24:08,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 16:24:08,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 16:24:08,800 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 16:24:08,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:08,800 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 16:24:08,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:24:08,801 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 16:24:08,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 16:24:08,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:08,801 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:08,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:24:08,801 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:08,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:08,802 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 16:24:08,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:08,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237589688] [2020-08-18 16:24:08,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:08,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:09,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:09,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:09,411 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:09,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237589688] [2020-08-18 16:24:09,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:09,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:24:09,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067353763] [2020-08-18 16:24:09,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:24:09,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:09,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:24:09,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:09,414 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 16:24:10,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:10,411 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 16:24:10,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:24:10,413 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 16:24:10,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:10,413 INFO L225 Difference]: With dead ends: 118 [2020-08-18 16:24:10,414 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 16:24:10,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:10,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 16:24:10,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 16:24:10,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 16:24:10,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 16:24:10,419 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 16:24:10,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:10,420 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 16:24:10,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:24:10,420 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 16:24:10,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 16:24:10,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:10,421 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:10,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:24:10,421 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:10,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:10,422 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 16:24:10,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:10,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355493001] [2020-08-18 16:24:10,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:10,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:11,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:11,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:11,042 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:11,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355493001] [2020-08-18 16:24:11,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:11,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:24:11,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232097594] [2020-08-18 16:24:11,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:24:11,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:11,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:24:11,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:11,044 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 16:24:12,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:12,218 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 16:24:12,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:24:12,220 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 16:24:12,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:12,221 INFO L225 Difference]: With dead ends: 122 [2020-08-18 16:24:12,221 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 16:24:12,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:12,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 16:24:12,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 16:24:12,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 16:24:12,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 16:24:12,228 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 16:24:12,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:12,229 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 16:24:12,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:24:12,230 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 16:24:12,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 16:24:12,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:12,231 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:12,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:24:12,232 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:12,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:12,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 16:24:12,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:12,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571230886] [2020-08-18 16:24:12,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:12,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:12,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:12,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:12,999 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:12,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571230886] [2020-08-18 16:24:13,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:13,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:24:13,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646357518] [2020-08-18 16:24:13,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:24:13,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:13,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:24:13,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:13,001 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 16:24:14,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,230 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 16:24:14,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:24:14,235 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 16:24:14,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,236 INFO L225 Difference]: With dead ends: 126 [2020-08-18 16:24:14,236 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 16:24:14,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:14,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 16:24:14,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 16:24:14,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 16:24:14,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 16:24:14,242 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 16:24:14,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,242 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 16:24:14,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:24:14,243 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 16:24:14,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 16:24:14,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,243 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:24:14,244 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,244 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 16:24:14,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042069566] [2020-08-18 16:24:14,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,958 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042069566] [2020-08-18 16:24:14,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:24:14,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17738611] [2020-08-18 16:24:14,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:24:14,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:24:14,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:14,961 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 16:24:16,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:16,139 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 16:24:16,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:24:16,142 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 16:24:16,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:16,143 INFO L225 Difference]: With dead ends: 130 [2020-08-18 16:24:16,143 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 16:24:16,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:16,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 16:24:16,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 16:24:16,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 16:24:16,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 16:24:16,150 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 16:24:16,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:16,151 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 16:24:16,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:24:16,151 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 16:24:16,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 16:24:16,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:16,152 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:16,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:24:16,152 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:16,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:16,152 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 16:24:16,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:16,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882612761] [2020-08-18 16:24:16,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:16,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:16,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,915 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:16,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882612761] [2020-08-18 16:24:16,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:16,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:24:16,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365148246] [2020-08-18 16:24:16,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:24:16,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:16,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:24:16,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:16,918 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 16:24:18,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:18,222 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 16:24:18,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:24:18,224 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 16:24:18,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:18,225 INFO L225 Difference]: With dead ends: 134 [2020-08-18 16:24:18,225 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 16:24:18,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:18,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 16:24:18,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 16:24:18,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 16:24:18,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 16:24:18,230 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 16:24:18,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:18,231 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 16:24:18,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:24:18,231 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 16:24:18,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 16:24:18,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:18,231 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:18,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:24:18,232 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:18,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:18,232 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 16:24:18,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:18,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785013988] [2020-08-18 16:24:18,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:18,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,232 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785013988] [2020-08-18 16:24:19,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:24:19,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123113642] [2020-08-18 16:24:19,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:24:19,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:24:19,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:19,237 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 16:24:20,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,892 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 16:24:20,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:24:20,893 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 16:24:20,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,893 INFO L225 Difference]: With dead ends: 138 [2020-08-18 16:24:20,894 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 16:24:20,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:20,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 16:24:20,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 16:24:20,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 16:24:20,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 16:24:20,901 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 16:24:20,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,902 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 16:24:20,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:24:20,902 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 16:24:20,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 16:24:20,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,903 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:24:20,903 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 16:24:20,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021742898] [2020-08-18 16:24:20,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,933 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021742898] [2020-08-18 16:24:21,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:24:21,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213869294] [2020-08-18 16:24:21,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:24:21,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:24:21,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:21,935 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 16:24:23,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:23,464 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 16:24:23,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:24:23,465 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 16:24:23,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:23,466 INFO L225 Difference]: With dead ends: 142 [2020-08-18 16:24:23,466 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 16:24:23,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:23,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 16:24:23,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 16:24:23,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 16:24:23,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 16:24:23,472 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 16:24:23,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:23,472 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 16:24:23,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:24:23,472 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 16:24:23,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 16:24:23,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:23,473 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:23,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:24:23,473 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:23,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:23,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 16:24:23,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:23,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828208274] [2020-08-18 16:24:23,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:23,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:24,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,383 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:24,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828208274] [2020-08-18 16:24:24,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:24,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:24:24,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944056031] [2020-08-18 16:24:24,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:24:24,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:24,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:24:24,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:24,386 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 16:24:26,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:26,071 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 16:24:26,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:24:26,071 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 16:24:26,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:26,072 INFO L225 Difference]: With dead ends: 146 [2020-08-18 16:24:26,072 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 16:24:26,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:26,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 16:24:26,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 16:24:26,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 16:24:26,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 16:24:26,077 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 16:24:26,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:26,078 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 16:24:26,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:24:26,078 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 16:24:26,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 16:24:26,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:26,079 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:26,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:24:26,079 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:26,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:26,079 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 16:24:26,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:26,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328208600] [2020-08-18 16:24:26,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:26,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:27,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,041 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:27,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328208600] [2020-08-18 16:24:27,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:27,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:24:27,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299237030] [2020-08-18 16:24:27,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:24:27,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:27,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:24:27,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:27,044 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 16:24:28,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:28,772 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 16:24:28,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:24:28,773 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 16:24:28,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:28,774 INFO L225 Difference]: With dead ends: 150 [2020-08-18 16:24:28,774 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 16:24:28,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:28,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 16:24:28,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 16:24:28,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 16:24:28,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 16:24:28,779 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 16:24:28,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:28,779 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 16:24:28,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:24:28,779 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 16:24:28,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 16:24:28,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:28,780 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:28,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:24:28,780 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:28,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:28,781 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 16:24:28,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:28,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56025266] [2020-08-18 16:24:28,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:28,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:29,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,832 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:29,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56025266] [2020-08-18 16:24:29,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:29,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:24:29,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089056123] [2020-08-18 16:24:29,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:24:29,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:29,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:24:29,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:29,836 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 16:24:31,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:31,694 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 16:24:31,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:24:31,694 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 16:24:31,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:31,696 INFO L225 Difference]: With dead ends: 154 [2020-08-18 16:24:31,696 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 16:24:31,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:31,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 16:24:31,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 16:24:31,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 16:24:31,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 16:24:31,702 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 16:24:31,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:31,703 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 16:24:31,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:24:31,703 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 16:24:31,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 16:24:31,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:31,704 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:31,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:24:31,704 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:31,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:31,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 16:24:31,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:31,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691806712] [2020-08-18 16:24:31,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:31,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:32,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:32,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691806712] [2020-08-18 16:24:32,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:32,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:24:32,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875929277] [2020-08-18 16:24:32,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:24:32,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:32,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:24:32,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:32,797 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 16:24:34,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:34,750 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 16:24:34,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:24:34,751 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 16:24:34,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:34,752 INFO L225 Difference]: With dead ends: 158 [2020-08-18 16:24:34,752 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 16:24:34,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:34,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 16:24:34,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 16:24:34,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 16:24:34,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 16:24:34,759 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 16:24:34,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:34,760 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 16:24:34,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:24:34,760 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 16:24:34,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 16:24:34,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:34,761 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:34,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:24:34,761 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:34,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:34,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 16:24:34,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:34,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252475823] [2020-08-18 16:24:34,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:34,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:35,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:35,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:35,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:35,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252475823] [2020-08-18 16:24:35,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:35,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:24:35,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533772356] [2020-08-18 16:24:35,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:24:35,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:35,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:24:35,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:35,918 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 16:24:37,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:37,909 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 16:24:37,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:24:37,912 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 16:24:37,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:37,912 INFO L225 Difference]: With dead ends: 162 [2020-08-18 16:24:37,912 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 16:24:37,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:37,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 16:24:37,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 16:24:37,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 16:24:37,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 16:24:37,918 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 16:24:37,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:37,918 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 16:24:37,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:24:37,919 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 16:24:37,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 16:24:37,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:37,919 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:37,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:24:37,920 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:37,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:37,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 16:24:37,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:37,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1316159031] [2020-08-18 16:24:37,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:37,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:39,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1316159031] [2020-08-18 16:24:39,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:39,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:24:39,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85747814] [2020-08-18 16:24:39,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:24:39,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:24:39,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:39,140 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 16:24:41,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:41,309 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 16:24:41,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:24:41,319 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 16:24:41,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:41,320 INFO L225 Difference]: With dead ends: 166 [2020-08-18 16:24:41,321 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 16:24:41,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:41,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 16:24:41,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 16:24:41,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 16:24:41,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 16:24:41,327 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 16:24:41,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:41,327 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 16:24:41,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:24:41,328 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 16:24:41,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 16:24:41,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:41,328 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:41,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:24:41,329 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:41,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:41,329 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 16:24:41,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:41,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516261275] [2020-08-18 16:24:41,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:41,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:42,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:42,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:42,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516261275] [2020-08-18 16:24:42,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:42,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:24:42,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144129938] [2020-08-18 16:24:42,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:24:42,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:42,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:24:42,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:42,742 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 16:24:44,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,957 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 16:24:44,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:24:44,958 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 16:24:44,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,959 INFO L225 Difference]: With dead ends: 170 [2020-08-18 16:24:44,959 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 16:24:44,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:44,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 16:24:44,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 16:24:44,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 16:24:44,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 16:24:44,965 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 16:24:44,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,965 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 16:24:44,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:24:44,966 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 16:24:44,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 16:24:44,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,966 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:24:44,967 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 16:24:44,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996014512] [2020-08-18 16:24:44,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:45,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:46,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996014512] [2020-08-18 16:24:46,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:46,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:24:46,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329958466] [2020-08-18 16:24:46,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:24:46,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:46,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:24:46,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:46,419 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 16:24:48,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:48,807 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 16:24:48,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:24:48,812 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 16:24:48,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:48,813 INFO L225 Difference]: With dead ends: 174 [2020-08-18 16:24:48,813 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 16:24:48,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:48,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 16:24:48,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 16:24:48,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 16:24:48,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 16:24:48,821 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 16:24:48,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:48,821 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 16:24:48,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:24:48,822 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 16:24:48,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 16:24:48,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:48,823 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:48,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:24:48,823 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:48,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:48,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 16:24:48,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:48,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461044855] [2020-08-18 16:24:48,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:48,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:50,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:50,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461044855] [2020-08-18 16:24:50,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:50,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:24:50,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548890867] [2020-08-18 16:24:50,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:24:50,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:50,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:24:50,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:50,280 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.