/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 -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 23:38:58,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:38:58,179 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:38:58,216 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:38:58,216 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:38:58,225 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:38:58,227 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:38:58,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:38:58,233 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:38:58,235 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:38:58,236 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:38:58,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:38:58,237 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:38:58,240 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:38:58,242 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:38:58,244 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:38:58,245 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:38:58,246 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:38:58,247 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:38:58,250 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:38:58,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:38:58,254 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:38:58,255 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:38:58,255 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:38:58,268 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 23:38:58,283 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:38:58,286 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:38:58,287 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:38:58,289 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 23:38:58,322 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:38:58,322 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:38:58,323 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:38:58,323 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:38:58,323 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:38:58,324 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:38:58,324 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:38:58,324 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:38:58,324 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:38:58,325 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:38:58,326 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:38:58,326 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:38:58,326 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:38:58,326 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:38:58,326 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:38:58,327 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:38:58,327 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:38:58,327 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:38:58,327 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:38:58,328 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:38:58,655 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:38:58,674 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:38:58,678 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:38:58,680 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:38:58,680 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:38:58,681 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 23:38:58,754 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9cf7d01c9/4a5b4ff966104ffeaf2088a280452c82/FLAG72741f2b1 [2020-08-18 23:38:59,224 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:38:59,225 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 23:38:59,231 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9cf7d01c9/4a5b4ff966104ffeaf2088a280452c82/FLAG72741f2b1 [2020-08-18 23:38:59,627 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9cf7d01c9/4a5b4ff966104ffeaf2088a280452c82 [2020-08-18 23:38:59,635 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:38:59,637 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:38:59,638 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:38:59,638 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:38:59,642 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:38:59,643 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:38:59" (1/1) ... [2020-08-18 23:38:59,648 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@369e4506 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:38:59, skipping insertion in model container [2020-08-18 23:38:59,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:38:59" (1/1) ... [2020-08-18 23:38:59,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:38:59,672 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:38:59,847 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:38:59,890 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:38:59,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:00,049 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:39:00,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00 WrapperNode [2020-08-18 23:39:00,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:00,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:39:00,051 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:39:00,051 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:39:00,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,063 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,072 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,072 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,104 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (1/1) ... [2020-08-18 23:39:00,106 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:39:00,107 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:39:00,107 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:39:00,107 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:39:00,108 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (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 23:39:00,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:39:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:39:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:39:00,176 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:39:00,176 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:39:00,176 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 23:39:00,176 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 23:39:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:39:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 23:39:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 23:39:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:39:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 23:39:00,404 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:39:00,404 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 23:39:00,408 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:00 BoogieIcfgContainer [2020-08-18 23:39:00,409 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:39:00,410 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:39:00,410 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:39:00,414 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:39:00,414 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:38:59" (1/3) ... [2020-08-18 23:39:00,415 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f892d07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:00, skipping insertion in model container [2020-08-18 23:39:00,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:00" (2/3) ... [2020-08-18 23:39:00,415 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f892d07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:00, skipping insertion in model container [2020-08-18 23:39:00,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:00" (3/3) ... [2020-08-18 23:39:00,417 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 23:39:00,429 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:39:00,437 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:39:00,460 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:39:00,489 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:39:00,490 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:39:00,490 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:39:00,490 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:39:00,491 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:39:00,491 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:39:00,491 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:39:00,491 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:39:00,514 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 23:39:00,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 23:39:00,522 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:00,523 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:00,524 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:00,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:00,531 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 23:39:00,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:00,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356154395] [2020-08-18 23:39:00,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:00,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:00,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:00,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:00,756 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 23:39:00,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356154395] [2020-08-18 23:39:00,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:00,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 23:39:00,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123919271] [2020-08-18 23:39:00,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 23:39:00,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:00,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 23:39:00,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:00,779 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 23:39:00,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:00,881 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 23:39:00,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 23:39:00,883 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 23:39:00,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:00,892 INFO L225 Difference]: With dead ends: 42 [2020-08-18 23:39:00,892 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 23:39:00,895 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 23:39:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 23:39:00,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 23:39:00,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 23:39:00,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 23:39:00,929 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 23:39:00,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:00,929 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 23:39:00,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 23:39:00,930 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 23:39:00,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 23:39:00,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:00,930 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:00,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:39:00,931 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:00,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:00,932 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 23:39:00,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:00,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010658481] [2020-08-18 23:39:00,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:00,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,019 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 23:39:01,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010658481] [2020-08-18 23:39:01,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:01,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:39:01,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856179236] [2020-08-18 23:39:01,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:01,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:01,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:01,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:01,023 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 23:39:01,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:01,115 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 23:39:01,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:01,116 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 23:39:01,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:01,117 INFO L225 Difference]: With dead ends: 36 [2020-08-18 23:39:01,117 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 23:39:01,118 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 23:39:01,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 23:39:01,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 23:39:01,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 23:39:01,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 23:39:01,125 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 23:39:01,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:01,126 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 23:39:01,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:01,126 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 23:39:01,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 23:39:01,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:01,127 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:01,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:39:01,127 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:01,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:01,128 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 23:39:01,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:01,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635096549] [2020-08-18 23:39:01,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:01,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,203 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 23:39:01,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635096549] [2020-08-18 23:39:01,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:01,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:39:01,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115923363] [2020-08-18 23:39:01,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:01,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:01,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:01,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:01,206 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 23:39:01,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:01,360 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 23:39:01,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:01,361 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 23:39:01,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:01,363 INFO L225 Difference]: With dead ends: 40 [2020-08-18 23:39:01,363 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 23:39:01,364 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 23:39:01,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 23:39:01,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 23:39:01,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 23:39:01,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 23:39:01,372 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 23:39:01,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:01,372 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 23:39:01,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:01,373 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 23:39:01,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 23:39:01,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:01,374 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:01,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 23:39:01,375 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:01,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:01,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 23:39:01,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:01,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798935598] [2020-08-18 23:39:01,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:01,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,449 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 23:39:01,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798935598] [2020-08-18 23:39:01,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:01,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:39:01,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529811057] [2020-08-18 23:39:01,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:01,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:01,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:01,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:01,452 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 23:39:01,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:01,537 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 23:39:01,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:01,538 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 23:39:01,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:01,539 INFO L225 Difference]: With dead ends: 31 [2020-08-18 23:39:01,539 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 23:39:01,540 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 23:39:01,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 23:39:01,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 23:39:01,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 23:39:01,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 23:39:01,546 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 23:39:01,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:01,546 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 23:39:01,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:01,547 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 23:39:01,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 23:39:01,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:01,548 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 23:39:01,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 23:39:01,549 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:01,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:01,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 23:39:01,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:01,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242721038] [2020-08-18 23:39:01,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:01,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,674 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 23:39:01,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242721038] [2020-08-18 23:39:01,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:01,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 23:39:01,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39887953] [2020-08-18 23:39:01,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:39:01,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:01,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:39:01,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:01,677 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 23:39:01,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:01,764 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 23:39:01,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 23:39:01,765 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 23:39:01,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:01,766 INFO L225 Difference]: With dead ends: 34 [2020-08-18 23:39:01,766 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 23:39:01,767 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 23:39:01,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 23:39:01,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 23:39:01,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 23:39:01,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 23:39:01,774 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 23:39:01,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:01,774 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 23:39:01,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:39:01,775 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 23:39:01,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 23:39:01,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:01,776 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 23:39:01,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 23:39:01,777 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:01,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:01,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 23:39:01,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:01,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854667919] [2020-08-18 23:39:01,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:01,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:01,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:01,947 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 23:39:01,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854667919] [2020-08-18 23:39:01,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:01,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 23:39:01,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82378514] [2020-08-18 23:39:01,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 23:39:01,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:01,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 23:39:01,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:01,950 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 23:39:02,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:02,039 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 23:39:02,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 23:39:02,039 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 23:39:02,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:02,040 INFO L225 Difference]: With dead ends: 38 [2020-08-18 23:39:02,040 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 23:39:02,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:02,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 23:39:02,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 23:39:02,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 23:39:02,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 23:39:02,047 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 23:39:02,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:02,047 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 23:39:02,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 23:39:02,047 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 23:39:02,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 23:39:02,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:02,048 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 23:39:02,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 23:39:02,049 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:02,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:02,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 23:39:02,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:02,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699566565] [2020-08-18 23:39:02,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:02,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:02,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,180 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 23:39:02,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699566565] [2020-08-18 23:39:02,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:02,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 23:39:02,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142463664] [2020-08-18 23:39:02,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 23:39:02,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:02,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 23:39:02,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:02,183 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 23:39:02,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:02,293 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 23:39:02,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 23:39:02,294 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 23:39:02,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:02,294 INFO L225 Difference]: With dead ends: 42 [2020-08-18 23:39:02,295 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 23:39:02,295 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 23:39:02,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 23:39:02,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 23:39:02,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 23:39:02,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 23:39:02,307 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 23:39:02,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:02,307 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 23:39:02,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 23:39:02,308 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 23:39:02,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 23:39:02,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:02,309 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 23:39:02,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 23:39:02,309 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:02,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:02,310 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 23:39:02,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:02,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907371779] [2020-08-18 23:39:02,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:02,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:02,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,471 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 23:39:02,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907371779] [2020-08-18 23:39:02,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:02,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 23:39:02,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579684151] [2020-08-18 23:39:02,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 23:39:02,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:02,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 23:39:02,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 23:39:02,474 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 23:39:02,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:02,593 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 23:39:02,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 23:39:02,594 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 23:39:02,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:02,595 INFO L225 Difference]: With dead ends: 46 [2020-08-18 23:39:02,595 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 23:39:02,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:02,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 23:39:02,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 23:39:02,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 23:39:02,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 23:39:02,602 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 23:39:02,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:02,602 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 23:39:02,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 23:39:02,603 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 23:39:02,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 23:39:02,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:02,604 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 23:39:02,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 23:39:02,604 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:02,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:02,604 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 23:39:02,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:02,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174502175] [2020-08-18 23:39:02,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:02,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:02,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:02,774 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 23:39:02,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174502175] [2020-08-18 23:39:02,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:02,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 23:39:02,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328805922] [2020-08-18 23:39:02,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 23:39:02,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:02,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 23:39:02,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:02,778 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 23:39:02,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:02,927 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 23:39:02,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 23:39:02,928 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 23:39:02,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:02,929 INFO L225 Difference]: With dead ends: 50 [2020-08-18 23:39:02,929 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 23:39:02,930 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 23:39:02,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 23:39:02,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 23:39:02,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 23:39:02,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 23:39:02,936 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 23:39:02,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:02,936 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 23:39:02,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 23:39:02,937 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 23:39:02,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 23:39:02,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:02,938 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 23:39:02,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 23:39:02,938 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:02,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:02,939 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 23:39:02,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:02,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103953108] [2020-08-18 23:39:02,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:02,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:03,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,145 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 23:39:03,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103953108] [2020-08-18 23:39:03,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:03,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 23:39:03,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194354264] [2020-08-18 23:39:03,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 23:39:03,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:03,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 23:39:03,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:03,148 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 23:39:03,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:03,353 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 23:39:03,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 23:39:03,353 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 23:39:03,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:03,354 INFO L225 Difference]: With dead ends: 54 [2020-08-18 23:39:03,354 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 23:39:03,355 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 23:39:03,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 23:39:03,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 23:39:03,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 23:39:03,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 23:39:03,361 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 23:39:03,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:03,362 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 23:39:03,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 23:39:03,362 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 23:39:03,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 23:39:03,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:03,363 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 23:39:03,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 23:39:03,363 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:03,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:03,364 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 23:39:03,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:03,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849610392] [2020-08-18 23:39:03,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:03,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:03,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:03,556 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 23:39:03,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849610392] [2020-08-18 23:39:03,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:03,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 23:39:03,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093579175] [2020-08-18 23:39:03,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 23:39:03,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:03,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 23:39:03,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:03,559 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 23:39:03,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:03,775 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 23:39:03,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 23:39:03,776 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 23:39:03,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:03,776 INFO L225 Difference]: With dead ends: 58 [2020-08-18 23:39:03,776 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 23:39:03,779 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 23:39:03,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 23:39:03,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 23:39:03,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 23:39:03,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 23:39:03,789 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 23:39:03,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:03,789 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 23:39:03,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 23:39:03,790 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 23:39:03,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 23:39:03,792 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:03,792 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 23:39:03,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 23:39:03,792 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:03,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:03,793 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 23:39:03,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:03,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053007663] [2020-08-18 23:39:03,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:03,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:04,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:04,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:04,034 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 23:39:04,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053007663] [2020-08-18 23:39:04,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:04,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 23:39:04,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037231066] [2020-08-18 23:39:04,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 23:39:04,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:04,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 23:39:04,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:04,037 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 23:39:04,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:04,263 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 23:39:04,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 23:39:04,263 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 23:39:04,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:04,264 INFO L225 Difference]: With dead ends: 62 [2020-08-18 23:39:04,264 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 23:39:04,265 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 23:39:04,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 23:39:04,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 23:39:04,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 23:39:04,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 23:39:04,270 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 23:39:04,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:04,271 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 23:39:04,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 23:39:04,271 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 23:39:04,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 23:39:04,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:04,272 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 23:39:04,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 23:39:04,272 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:04,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:04,273 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 23:39:04,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:04,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605584891] [2020-08-18 23:39:04,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:04,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:04,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:04,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:04,487 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 23:39:04,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605584891] [2020-08-18 23:39:04,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:04,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 23:39:04,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273872811] [2020-08-18 23:39:04,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 23:39:04,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:04,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 23:39:04,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:39:04,490 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 23:39:04,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:04,761 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 23:39:04,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 23:39:04,762 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 23:39:04,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:04,763 INFO L225 Difference]: With dead ends: 66 [2020-08-18 23:39:04,763 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 23:39:04,763 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 23:39:04,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 23:39:04,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 23:39:04,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 23:39:04,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 23:39:04,778 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 23:39:04,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:04,778 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 23:39:04,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 23:39:04,779 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 23:39:04,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 23:39:04,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:04,780 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 23:39:04,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 23:39:04,781 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:04,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:04,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 23:39:04,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:04,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1466106812] [2020-08-18 23:39:04,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:04,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:05,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:05,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:05,039 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 23:39:05,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1466106812] [2020-08-18 23:39:05,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:05,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 23:39:05,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477140585] [2020-08-18 23:39:05,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 23:39:05,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:05,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 23:39:05,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 23:39:05,043 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 23:39:05,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:05,350 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 23:39:05,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 23:39:05,350 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 23:39:05,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:05,351 INFO L225 Difference]: With dead ends: 70 [2020-08-18 23:39:05,351 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 23:39:05,352 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 23:39:05,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 23:39:05,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 23:39:05,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 23:39:05,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 23:39:05,358 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 23:39:05,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:05,359 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 23:39:05,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 23:39:05,359 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 23:39:05,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 23:39:05,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:05,360 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 23:39:05,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 23:39:05,360 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:05,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:05,361 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 23:39:05,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:05,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408548463] [2020-08-18 23:39:05,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:05,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:05,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:05,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:05,606 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 23:39:05,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408548463] [2020-08-18 23:39:05,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:05,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 23:39:05,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726492095] [2020-08-18 23:39:05,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 23:39:05,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:05,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 23:39:05,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:39:05,608 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 23:39:05,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:05,991 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 23:39:05,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 23:39:05,991 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 23:39:05,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:05,992 INFO L225 Difference]: With dead ends: 74 [2020-08-18 23:39:05,992 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 23:39:05,993 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 23:39:05,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 23:39:05,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 23:39:05,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 23:39:06,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 23:39:06,000 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 23:39:06,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:06,001 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 23:39:06,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 23:39:06,001 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 23:39:06,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 23:39:06,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:06,002 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 23:39:06,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 23:39:06,002 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:06,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:06,003 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 23:39:06,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:06,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774583535] [2020-08-18 23:39:06,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:06,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:06,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:06,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:06,297 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 23:39:06,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774583535] [2020-08-18 23:39:06,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:06,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 23:39:06,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353588337] [2020-08-18 23:39:06,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 23:39:06,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:06,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 23:39:06,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:39:06,302 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 23:39:06,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:06,743 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 23:39:06,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 23:39:06,743 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 23:39:06,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:06,744 INFO L225 Difference]: With dead ends: 78 [2020-08-18 23:39:06,744 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 23:39:06,745 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 23:39:06,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 23:39:06,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 23:39:06,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 23:39:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 23:39:06,751 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 23:39:06,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:06,751 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 23:39:06,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 23:39:06,752 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 23:39:06,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 23:39:06,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:06,753 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 23:39:06,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 23:39:06,753 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:06,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:06,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 23:39:06,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:06,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554719225] [2020-08-18 23:39:06,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:06,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:07,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:07,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:07,035 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 23:39:07,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554719225] [2020-08-18 23:39:07,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:07,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 23:39:07,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990564903] [2020-08-18 23:39:07,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 23:39:07,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:07,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 23:39:07,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:39:07,038 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 23:39:07,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:07,428 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 23:39:07,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 23:39:07,429 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 23:39:07,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:07,430 INFO L225 Difference]: With dead ends: 82 [2020-08-18 23:39:07,430 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 23:39:07,431 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 23:39:07,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 23:39:07,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 23:39:07,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 23:39:07,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 23:39:07,437 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 23:39:07,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:07,437 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 23:39:07,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 23:39:07,437 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 23:39:07,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 23:39:07,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:07,438 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 23:39:07,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 23:39:07,439 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:07,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:07,439 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 23:39:07,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:07,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116741506] [2020-08-18 23:39:07,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:07,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:07,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:07,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:07,734 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 23:39:07,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116741506] [2020-08-18 23:39:07,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:07,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 23:39:07,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880705881] [2020-08-18 23:39:07,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 23:39:07,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:07,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 23:39:07,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:39:07,736 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 23:39:08,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:08,254 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 23:39:08,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 23:39:08,255 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 23:39:08,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:08,256 INFO L225 Difference]: With dead ends: 86 [2020-08-18 23:39:08,256 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 23:39:08,256 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:08,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 23:39:08,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 23:39:08,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 23:39:08,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 23:39:08,262 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 23:39:08,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:08,262 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 23:39:08,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 23:39:08,263 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 23:39:08,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 23:39:08,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:08,264 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 23:39:08,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 23:39:08,264 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:08,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:08,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 23:39:08,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:08,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269237009] [2020-08-18 23:39:08,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:08,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:08,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:08,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:08,596 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 23:39:08,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269237009] [2020-08-18 23:39:08,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:08,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 23:39:08,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599462298] [2020-08-18 23:39:08,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 23:39:08,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:08,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 23:39:08,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:39:08,598 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 23:39:09,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:09,167 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 23:39:09,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 23:39:09,167 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 23:39:09,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:09,168 INFO L225 Difference]: With dead ends: 90 [2020-08-18 23:39:09,168 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 23:39:09,169 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 23:39:09,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 23:39:09,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 23:39:09,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 23:39:09,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 23:39:09,175 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 23:39:09,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:09,175 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 23:39:09,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 23:39:09,176 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 23:39:09,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 23:39:09,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:09,177 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 23:39:09,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 23:39:09,177 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:09,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:09,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 23:39:09,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:09,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066276589] [2020-08-18 23:39:09,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:09,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:09,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:09,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:09,528 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 23:39:09,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066276589] [2020-08-18 23:39:09,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:09,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 23:39:09,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020721970] [2020-08-18 23:39:09,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 23:39:09,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:09,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 23:39:09,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 23:39:09,530 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 23:39:10,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:10,119 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 23:39:10,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 23:39:10,119 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 23:39:10,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:10,120 INFO L225 Difference]: With dead ends: 94 [2020-08-18 23:39:10,120 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 23:39:10,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:10,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 23:39:10,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 23:39:10,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 23:39:10,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 23:39:10,127 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 23:39:10,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:10,128 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 23:39:10,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 23:39:10,128 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 23:39:10,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 23:39:10,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:10,129 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 23:39:10,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 23:39:10,129 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:10,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:10,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 23:39:10,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:10,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049812643] [2020-08-18 23:39:10,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:10,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:10,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:10,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:10,569 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 23:39:10,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049812643] [2020-08-18 23:39:10,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:10,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 23:39:10,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594455872] [2020-08-18 23:39:10,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 23:39:10,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:10,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 23:39:10,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:39:10,572 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 23:39:11,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:11,151 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 23:39:11,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 23:39:11,152 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 23:39:11,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:11,152 INFO L225 Difference]: With dead ends: 98 [2020-08-18 23:39:11,153 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 23:39:11,153 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 23:39:11,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 23:39:11,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 23:39:11,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 23:39:11,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 23:39:11,166 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 23:39:11,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:11,166 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 23:39:11,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 23:39:11,166 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 23:39:11,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 23:39:11,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:11,167 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 23:39:11,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 23:39:11,167 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:11,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:11,168 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 23:39:11,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:11,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385250965] [2020-08-18 23:39:11,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:11,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:11,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:11,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:11,663 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 23:39:11,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385250965] [2020-08-18 23:39:11,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:11,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 23:39:11,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870016703] [2020-08-18 23:39:11,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 23:39:11,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:11,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 23:39:11,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 23:39:11,665 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 23:39:12,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:12,521 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 23:39:12,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 23:39:12,528 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 23:39:12,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:12,529 INFO L225 Difference]: With dead ends: 102 [2020-08-18 23:39:12,529 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 23:39:12,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:12,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 23:39:12,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 23:39:12,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 23:39:12,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 23:39:12,545 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 23:39:12,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:12,546 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 23:39:12,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 23:39:12,546 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 23:39:12,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 23:39:12,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:12,549 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 23:39:12,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 23:39:12,550 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:12,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:12,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 23:39:12,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:12,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819198663] [2020-08-18 23:39:12,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:12,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:13,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:13,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:13,051 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 23:39:13,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819198663] [2020-08-18 23:39:13,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:13,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 23:39:13,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266159898] [2020-08-18 23:39:13,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 23:39:13,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:13,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 23:39:13,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:39:13,057 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 23:39:13,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:13,818 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 23:39:13,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 23:39:13,824 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 23:39:13,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:13,825 INFO L225 Difference]: With dead ends: 106 [2020-08-18 23:39:13,825 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 23:39:13,826 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 23:39:13,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 23:39:13,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 23:39:13,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 23:39:13,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 23:39:13,831 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 23:39:13,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:13,831 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 23:39:13,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 23:39:13,831 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 23:39:13,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 23:39:13,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:13,832 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 23:39:13,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 23:39:13,832 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:13,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:13,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 23:39:13,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:13,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523288415] [2020-08-18 23:39:13,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:13,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:14,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:14,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:14,358 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 23:39:14,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523288415] [2020-08-18 23:39:14,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:14,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 23:39:14,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297172742] [2020-08-18 23:39:14,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 23:39:14,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:14,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 23:39:14,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:39:14,360 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 23:39:15,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:15,133 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 23:39:15,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 23:39:15,136 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 23:39:15,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:15,136 INFO L225 Difference]: With dead ends: 110 [2020-08-18 23:39:15,136 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 23:39:15,137 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 23:39:15,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 23:39:15,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 23:39:15,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 23:39:15,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 23:39:15,142 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 23:39:15,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:15,142 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 23:39:15,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 23:39:15,142 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 23:39:15,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 23:39:15,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:15,143 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 23:39:15,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 23:39:15,143 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:15,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:15,144 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 23:39:15,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:15,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775844505] [2020-08-18 23:39:15,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:15,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:15,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:15,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:15,709 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 23:39:15,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775844505] [2020-08-18 23:39:15,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:15,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 23:39:15,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302987705] [2020-08-18 23:39:15,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 23:39:15,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:15,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 23:39:15,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:39:15,711 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 23:39:16,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:16,567 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 23:39:16,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 23:39:16,568 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 23:39:16,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:16,569 INFO L225 Difference]: With dead ends: 114 [2020-08-18 23:39:16,569 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 23:39:16,570 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 23:39:16,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 23:39:16,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 23:39:16,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 23:39:16,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 23:39:16,578 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 23:39:16,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:16,579 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 23:39:16,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 23:39:16,579 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 23:39:16,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 23:39:16,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:16,580 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 23:39:16,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 23:39:16,580 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:16,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:16,581 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 23:39:16,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:16,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70208865] [2020-08-18 23:39:16,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:16,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:17,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:17,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:17,201 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 23:39:17,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70208865] [2020-08-18 23:39:17,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:17,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 23:39:17,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021891346] [2020-08-18 23:39:17,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 23:39:17,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:17,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 23:39:17,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 23:39:17,203 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 23:39:18,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:18,141 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 23:39:18,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 23:39:18,141 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 23:39:18,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:18,142 INFO L225 Difference]: With dead ends: 118 [2020-08-18 23:39:18,143 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 23:39:18,143 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 23:39:18,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 23:39:18,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 23:39:18,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 23:39:18,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 23:39:18,148 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 23:39:18,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:18,149 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 23:39:18,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 23:39:18,149 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 23:39:18,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 23:39:18,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:18,150 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 23:39:18,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 23:39:18,150 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:18,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:18,150 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 23:39:18,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:18,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957807246] [2020-08-18 23:39:18,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:18,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:18,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:18,776 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 23:39:18,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957807246] [2020-08-18 23:39:18,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:18,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 23:39:18,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037203570] [2020-08-18 23:39:18,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 23:39:18,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:18,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 23:39:18,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:39:18,778 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 23:39:19,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:19,959 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 23:39:19,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 23:39:19,963 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 23:39:19,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:19,964 INFO L225 Difference]: With dead ends: 122 [2020-08-18 23:39:19,964 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 23:39:19,965 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 23:39:19,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 23:39:19,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 23:39:19,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 23:39:19,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 23:39:19,969 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 23:39:19,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:19,969 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 23:39:19,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 23:39:19,970 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 23:39:19,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 23:39:19,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:19,970 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 23:39:19,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 23:39:19,971 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:19,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:19,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 23:39:19,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:19,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663958130] [2020-08-18 23:39:19,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:20,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:20,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:20,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:20,581 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 23:39:20,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663958130] [2020-08-18 23:39:20,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:20,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 23:39:20,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183864612] [2020-08-18 23:39:20,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 23:39:20,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:20,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 23:39:20,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 23:39:20,585 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 23:39:21,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:21,742 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 23:39:21,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 23:39:21,744 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 23:39:21,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:21,744 INFO L225 Difference]: With dead ends: 126 [2020-08-18 23:39:21,745 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 23:39:21,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:21,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 23:39:21,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 23:39:21,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 23:39:21,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 23:39:21,749 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 23:39:21,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:21,750 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 23:39:21,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 23:39:21,750 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 23:39:21,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 23:39:21,750 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:21,751 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 23:39:21,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 23:39:21,751 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:21,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:21,751 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 23:39:21,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:21,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084562913] [2020-08-18 23:39:21,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:21,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:22,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:22,461 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 23:39:22,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084562913] [2020-08-18 23:39:22,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:22,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 23:39:22,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370188655] [2020-08-18 23:39:22,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 23:39:22,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:22,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 23:39:22,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 23:39:22,464 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 23:39:23,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:23,677 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 23:39:23,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 23:39:23,684 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 23:39:23,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:23,685 INFO L225 Difference]: With dead ends: 130 [2020-08-18 23:39:23,685 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 23:39:23,686 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 23:39:23,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 23:39:23,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 23:39:23,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 23:39:23,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 23:39:23,692 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 23:39:23,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:23,693 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 23:39:23,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 23:39:23,693 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 23:39:23,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 23:39:23,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:23,694 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 23:39:23,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 23:39:23,694 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:23,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:23,694 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 23:39:23,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:23,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136677059] [2020-08-18 23:39:23,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:23,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:24,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:24,434 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 23:39:24,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136677059] [2020-08-18 23:39:24,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:24,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 23:39:24,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588503593] [2020-08-18 23:39:24,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 23:39:24,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:24,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 23:39:24,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 23:39:24,436 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 23:39:25,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:25,740 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 23:39:25,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 23:39:25,747 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 23:39:25,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:25,748 INFO L225 Difference]: With dead ends: 134 [2020-08-18 23:39:25,748 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 23:39:25,749 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 23:39:25,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 23:39:25,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 23:39:25,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 23:39:25,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 23:39:25,753 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 23:39:25,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:25,753 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 23:39:25,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 23:39:25,754 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 23:39:25,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 23:39:25,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:25,754 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 23:39:25,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 23:39:25,755 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:25,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:25,755 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 23:39:25,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:25,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007928322] [2020-08-18 23:39:25,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:25,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:26,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:26,623 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 23:39:26,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007928322] [2020-08-18 23:39:26,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:26,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 23:39:26,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933362656] [2020-08-18 23:39:26,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 23:39:26,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:26,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 23:39:26,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 23:39:26,626 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 23:39:28,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:28,035 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 23:39:28,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 23:39:28,037 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 23:39:28,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:28,038 INFO L225 Difference]: With dead ends: 138 [2020-08-18 23:39:28,038 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 23:39:28,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:28,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 23:39:28,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 23:39:28,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 23:39:28,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 23:39:28,044 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 23:39:28,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:28,044 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 23:39:28,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 23:39:28,044 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 23:39:28,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 23:39:28,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:28,045 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 23:39:28,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 23:39:28,045 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:28,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:28,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 23:39:28,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:28,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523918834] [2020-08-18 23:39:28,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:28,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:28,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:28,891 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 23:39:28,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523918834] [2020-08-18 23:39:28,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:28,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 23:39:28,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276434543] [2020-08-18 23:39:28,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 23:39:28,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:28,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 23:39:28,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 23:39:28,893 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 23:39:30,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:30,786 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 23:39:30,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 23:39:30,792 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 23:39:30,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:30,793 INFO L225 Difference]: With dead ends: 142 [2020-08-18 23:39:30,793 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 23:39:30,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:30,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 23:39:30,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 23:39:30,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 23:39:30,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 23:39:30,800 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 23:39:30,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:30,801 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 23:39:30,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 23:39:30,801 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 23:39:30,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 23:39:30,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:30,802 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 23:39:30,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 23:39:30,802 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:30,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:30,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 23:39:30,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:30,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284103876] [2020-08-18 23:39:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:30,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:31,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:31,733 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 23:39:31,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284103876] [2020-08-18 23:39:31,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:31,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 23:39:31,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424545918] [2020-08-18 23:39:31,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 23:39:31,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:31,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 23:39:31,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 23:39:31,735 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 23:39:34,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:34,104 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 23:39:34,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 23:39:34,105 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 23:39:34,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:34,106 INFO L225 Difference]: With dead ends: 146 [2020-08-18 23:39:34,106 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 23:39:34,107 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 23:39:34,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 23:39:34,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 23:39:34,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 23:39:34,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 23:39:34,112 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 23:39:34,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:34,112 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 23:39:34,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 23:39:34,112 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 23:39:34,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 23:39:34,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:34,113 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 23:39:34,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 23:39:34,113 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:34,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:34,113 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 23:39:34,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:34,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908107935] [2020-08-18 23:39:34,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:34,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:35,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:35,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:35,102 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 23:39:35,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908107935] [2020-08-18 23:39:35,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:35,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 23:39:35,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695547664] [2020-08-18 23:39:35,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 23:39:35,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:35,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 23:39:35,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 23:39:35,104 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 23:39:36,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:36,847 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 23:39:36,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 23:39:36,848 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 23:39:36,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:36,849 INFO L225 Difference]: With dead ends: 150 [2020-08-18 23:39:36,849 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 23:39:36,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:36,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 23:39:36,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 23:39:36,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 23:39:36,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 23:39:36,855 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 23:39:36,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:36,856 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 23:39:36,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 23:39:36,856 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 23:39:36,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 23:39:36,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:36,857 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 23:39:36,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 23:39:36,857 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:36,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:36,858 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 23:39:36,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:36,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156051320] [2020-08-18 23:39:36,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:36,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:37,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:37,879 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 23:39:37,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156051320] [2020-08-18 23:39:37,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:37,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 23:39:37,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363762081] [2020-08-18 23:39:37,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 23:39:37,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:37,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 23:39:37,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 23:39:37,881 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 23:39:39,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:39,675 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 23:39:39,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 23:39:39,681 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 23:39:39,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:39,682 INFO L225 Difference]: With dead ends: 154 [2020-08-18 23:39:39,683 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 23:39:39,684 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 23:39:39,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 23:39:39,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 23:39:39,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 23:39:39,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 23:39:39,690 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 23:39:39,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:39,690 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 23:39:39,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 23:39:39,691 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 23:39:39,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 23:39:39,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:39,692 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 23:39:39,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 23:39:39,692 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:39,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:39,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 23:39:39,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:39,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580768703] [2020-08-18 23:39:39,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:39,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:40,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:40,738 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 23:39:40,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580768703] [2020-08-18 23:39:40,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:40,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 23:39:40,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945094151] [2020-08-18 23:39:40,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 23:39:40,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:40,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 23:39:40,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 23:39:40,740 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 23:39:42,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:42,740 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 23:39:42,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 23:39:42,741 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 23:39:42,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:42,741 INFO L225 Difference]: With dead ends: 158 [2020-08-18 23:39:42,742 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 23:39:42,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:42,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 23:39:42,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 23:39:42,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 23:39:42,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 23:39:42,748 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 23:39:42,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:42,749 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 23:39:42,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 23:39:42,749 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 23:39:42,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 23:39:42,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:42,750 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 23:39:42,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 23:39:42,750 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:42,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:42,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 23:39:42,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:42,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257625463] [2020-08-18 23:39:42,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:42,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:44,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:44,157 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 23:39:44,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257625463] [2020-08-18 23:39:44,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:44,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 23:39:44,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436081735] [2020-08-18 23:39:44,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 23:39:44,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:44,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 23:39:44,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 23:39:44,160 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 23:39:46,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:46,106 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 23:39:46,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 23:39:46,116 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 23:39:46,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:46,116 INFO L225 Difference]: With dead ends: 162 [2020-08-18 23:39:46,117 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 23:39:46,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:46,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 23:39:46,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 23:39:46,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 23:39:46,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 23:39:46,127 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 23:39:46,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:46,127 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 23:39:46,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 23:39:46,127 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 23:39:46,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 23:39:46,128 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:46,128 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 23:39:46,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 23:39:46,129 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:46,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:46,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 23:39:46,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:46,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237751783] [2020-08-18 23:39:46,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:46,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:47,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:47,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:47,414 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 23:39:47,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237751783] [2020-08-18 23:39:47,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:47,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 23:39:47,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729100479] [2020-08-18 23:39:47,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 23:39:47,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:47,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 23:39:47,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 23:39:47,417 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 23:39:49,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:49,564 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 23:39:49,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 23:39:49,567 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 23:39:49,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:49,568 INFO L225 Difference]: With dead ends: 166 [2020-08-18 23:39:49,568 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 23:39:49,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:49,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 23:39:49,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 23:39:49,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 23:39:49,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 23:39:49,574 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 23:39:49,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:49,574 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 23:39:49,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 23:39:49,575 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 23:39:49,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 23:39:49,575 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:49,575 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 23:39:49,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 23:39:49,576 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:49,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:49,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 23:39:49,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:49,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593105725] [2020-08-18 23:39:49,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:49,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:50,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:50,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:50,920 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 23:39:50,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593105725] [2020-08-18 23:39:50,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:50,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 23:39:50,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035935938] [2020-08-18 23:39:50,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 23:39:50,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:50,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 23:39:50,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 23:39:50,921 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 23:39:53,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,216 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 23:39:53,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 23:39:53,217 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 23:39:53,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,217 INFO L225 Difference]: With dead ends: 170 [2020-08-18 23:39:53,218 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 23:39:53,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:53,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 23:39:53,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 23:39:53,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 23:39:53,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 23:39:53,224 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 23:39:53,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,224 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 23:39:53,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 23:39:53,225 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 23:39:53,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 23:39:53,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,226 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 23:39:53,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 23:39:53,226 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 23:39:53,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548023791] [2020-08-18 23:39:53,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,572 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 23:39:54,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548023791] [2020-08-18 23:39:54,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:54,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 23:39:54,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573190678] [2020-08-18 23:39:54,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 23:39:54,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 23:39:54,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 23:39:54,575 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 23:39:56,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:56,902 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 23:39:56,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 23:39:56,903 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 23:39:56,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:56,904 INFO L225 Difference]: With dead ends: 174 [2020-08-18 23:39:56,904 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 23:39:56,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 23:39:56,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 23:39:56,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 23:39:56,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 23:39:56,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 23:39:56,912 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 23:39:56,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:56,912 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 23:39:56,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 23:39:56,912 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 23:39:56,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 23:39:56,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:56,913 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 23:39:56,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 23:39:56,913 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:56,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:56,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 23:39:56,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:56,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970625193] [2020-08-18 23:39:56,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:56,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat