/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 false -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-eb0fd7c [2020-09-21 10:28:46,173 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:28:46,177 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:28:46,203 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:28:46,203 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:28:46,205 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:28:46,206 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:28:46,208 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:28:46,209 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:28:46,210 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:28:46,211 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:28:46,213 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:28:46,213 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:28:46,214 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:28:46,215 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:28:46,216 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:28:46,217 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:28:46,218 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:28:46,220 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:28:46,222 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:28:46,224 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:28:46,225 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:28:46,226 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:28:46,227 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:28:46,229 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:28:46,238 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:28:46,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:28:46,241 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:28:46,243 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 [2020-09-21 10:28:46,300 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:28:46,300 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:28:46,302 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:28:46,302 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:28:46,302 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:28:46,302 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:28:46,303 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:28:46,305 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:28:46,305 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:28:46,305 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:28:46,305 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:28:46,306 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:28:46,306 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:28:46,306 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:28:46,306 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:28:46,306 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:28:46,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:28:46,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:28:46,308 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:28:46,308 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:28:46,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:28:46,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:46,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:28:46,309 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:28:46,309 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:28:46,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:28:46,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:28:46,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:28:46,310 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:28:46,310 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 -> false [2020-09-21 10:28:46,826 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:28:46,848 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:28:46,857 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:28:46,859 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:28:46,859 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:28:46,861 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-09-21 10:28:46,937 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a701a53f/62238c447c694e87a4d42e97a4dd2d30/FLAG5b40c5461 [2020-09-21 10:28:47,489 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:28:47,490 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-09-21 10:28:47,498 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a701a53f/62238c447c694e87a4d42e97a4dd2d30/FLAG5b40c5461 [2020-09-21 10:28:47,800 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7a701a53f/62238c447c694e87a4d42e97a4dd2d30 [2020-09-21 10:28:47,815 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:28:47,823 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:28:47,825 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:47,825 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:28:47,830 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:28:47,831 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:47" (1/1) ... [2020-09-21 10:28:47,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6317371b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:47, skipping insertion in model container [2020-09-21 10:28:47,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:47" (1/1) ... [2020-09-21 10:28:47,847 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:28:47,873 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:28:48,092 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:48,142 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:28:48,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:48,314 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:28:48,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48 WrapperNode [2020-09-21 10:28:48,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:48,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:28:48,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:28:48,316 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:28:48,330 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,340 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,341 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,348 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,355 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,356 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,359 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:28:48,359 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:28:48,359 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:28:48,360 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:28:48,361 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:48,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:28:48,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:28:48,436 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:28:48,437 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:28:48,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-09-21 10:28:48,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:28:48,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:28:48,721 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:28:48,721 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 10:28:48,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:48 BoogieIcfgContainer [2020-09-21 10:28:48,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:28:48,729 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:28:48,729 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:28:48,733 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:28:48,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:28:47" (1/3) ... [2020-09-21 10:28:48,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@189025ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:48, skipping insertion in model container [2020-09-21 10:28:48,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (2/3) ... [2020-09-21 10:28:48,735 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@189025ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:48, skipping insertion in model container [2020-09-21 10:28:48,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:48" (3/3) ... [2020-09-21 10:28:48,738 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-09-21 10:28:48,754 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:28:48,764 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:28:48,789 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:28:48,823 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:28:48,823 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:28:48,823 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:28:48,824 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:28:48,824 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:28:48,824 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:28:48,824 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:28:48,824 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:28:48,846 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-09-21 10:28:48,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-09-21 10:28:48,853 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:48,854 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:48,855 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:48,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:48,862 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-09-21 10:28:48,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:48,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703216499] [2020-09-21 10:28:48,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:48,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703216499] [2020-09-21 10:28:49,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:28:49,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241269068] [2020-09-21 10:28:49,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:28:49,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:28:49,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:28:49,150 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-09-21 10:28:49,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,297 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-09-21 10:28:49,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:28:49,300 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-09-21 10:28:49,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,316 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:28:49,316 INFO L226 Difference]: Without dead ends: 23 [2020-09-21 10:28:49,321 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 [2020-09-21 10:28:49,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-21 10:28:49,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-09-21 10:28:49,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 10:28:49,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-09-21 10:28:49,365 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-09-21 10:28:49,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,365 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-09-21 10:28:49,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:28:49,366 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-09-21 10:28:49,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-09-21 10:28:49,366 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,367 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:28:49,367 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,368 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-09-21 10:28:49,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821292354] [2020-09-21 10:28:49,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821292354] [2020-09-21 10:28:49,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:49,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023339914] [2020-09-21 10:28:49,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:49,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:49,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:49,471 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-09-21 10:28:49,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,576 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-09-21 10:28:49,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:49,576 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-09-21 10:28:49,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,578 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:28:49,578 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 10:28:49,579 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 [2020-09-21 10:28:49,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 10:28:49,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-09-21 10:28:49,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 10:28:49,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-09-21 10:28:49,586 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-09-21 10:28:49,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,587 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-09-21 10:28:49,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:49,587 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-09-21 10:28:49,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:28:49,588 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:28:49,589 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,589 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-09-21 10:28:49,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259251779] [2020-09-21 10:28:49,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259251779] [2020-09-21 10:28:49,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:49,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210150391] [2020-09-21 10:28:49,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:49,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:49,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:49,669 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-09-21 10:28:49,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,767 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-09-21 10:28:49,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:49,768 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-09-21 10:28:49,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,769 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:28:49,769 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:28:49,770 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 [2020-09-21 10:28:49,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:28:49,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-09-21 10:28:49,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 10:28:49,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-09-21 10:28:49,777 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-09-21 10:28:49,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,778 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-09-21 10:28:49,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:49,778 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-09-21 10:28:49,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:28:49,779 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,779 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:28:49,780 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-09-21 10:28:49,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205037118] [2020-09-21 10:28:49,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205037118] [2020-09-21 10:28:49,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:49,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950137270] [2020-09-21 10:28:49,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:49,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:49,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:49,877 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-09-21 10:28:49,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,971 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-09-21 10:28:49,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:49,972 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-09-21 10:28:49,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,973 INFO L225 Difference]: With dead ends: 31 [2020-09-21 10:28:49,973 INFO L226 Difference]: Without dead ends: 21 [2020-09-21 10:28:49,974 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 [2020-09-21 10:28:49,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-21 10:28:49,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-09-21 10:28:49,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-21 10:28:49,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-09-21 10:28:49,987 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-09-21 10:28:49,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,988 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-09-21 10:28:49,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:49,988 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-09-21 10:28:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:28:49,991 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,991 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:28:49,992 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-09-21 10:28:49,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114041569] [2020-09-21 10:28:49,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:50,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114041569] [2020-09-21 10:28:50,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:50,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:28:50,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602508663] [2020-09-21 10:28:50,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:50,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:50,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:50,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:50,197 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-09-21 10:28:50,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:50,276 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-09-21 10:28:50,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:50,276 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-21 10:28:50,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:50,277 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:28:50,278 INFO L226 Difference]: Without dead ends: 23 [2020-09-21 10:28:50,278 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 [2020-09-21 10:28:50,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-21 10:28:50,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-09-21 10:28:50,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:28:50,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-09-21 10:28:50,285 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-09-21 10:28:50,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:50,285 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-09-21 10:28:50,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:50,286 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-09-21 10:28:50,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 10:28:50,287 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:50,287 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:50,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:28:50,287 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:50,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:50,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-09-21 10:28:50,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:50,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902934611] [2020-09-21 10:28:50,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,463 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:50,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902934611] [2020-09-21 10:28:50,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:50,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:28:50,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940517946] [2020-09-21 10:28:50,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:50,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:50,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:50,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:50,467 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-09-21 10:28:50,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:50,571 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-09-21 10:28:50,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:28:50,572 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-09-21 10:28:50,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:50,573 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:28:50,573 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:28:50,576 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 [2020-09-21 10:28:50,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:28:50,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-09-21 10:28:50,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-21 10:28:50,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-09-21 10:28:50,584 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-09-21 10:28:50,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:50,585 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-09-21 10:28:50,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:50,585 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-09-21 10:28:50,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 10:28:50,592 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:50,592 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:50,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:28:50,593 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:50,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:50,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-09-21 10:28:50,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:50,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114528516] [2020-09-21 10:28:50,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,750 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:50,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114528516] [2020-09-21 10:28:50,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:50,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:28:50,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969712890] [2020-09-21 10:28:50,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:28:50,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:50,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:28:50,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:50,753 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-09-21 10:28:50,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:50,855 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-09-21 10:28:50,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:28:50,855 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-09-21 10:28:50,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:50,856 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:28:50,857 INFO L226 Difference]: Without dead ends: 27 [2020-09-21 10:28:50,857 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 [2020-09-21 10:28:50,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-09-21 10:28:50,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-09-21 10:28:50,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 10:28:50,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-09-21 10:28:50,863 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-09-21 10:28:50,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:50,864 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-09-21 10:28:50,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:28:50,864 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-09-21 10:28:50,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-21 10:28:50,865 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:50,865 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:50,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:28:50,865 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:50,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:50,866 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-09-21 10:28:50,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:50,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972278485] [2020-09-21 10:28:50,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,003 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:51,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972278485] [2020-09-21 10:28:51,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:51,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104022865] [2020-09-21 10:28:51,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:51,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:51,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:51,006 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-09-21 10:28:51,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,122 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-09-21 10:28:51,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:28:51,122 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-09-21 10:28:51,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,123 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:28:51,123 INFO L226 Difference]: Without dead ends: 29 [2020-09-21 10:28:51,124 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 [2020-09-21 10:28:51,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-21 10:28:51,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-09-21 10:28:51,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 10:28:51,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-09-21 10:28:51,130 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-09-21 10:28:51,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,130 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-09-21 10:28:51,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:51,130 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-09-21 10:28:51,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 10:28:51,131 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,131 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:51,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:28:51,132 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,132 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-09-21 10:28:51,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547357498] [2020-09-21 10:28:51,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:51,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,284 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:51,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547357498] [2020-09-21 10:28:51,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:28:51,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904092184] [2020-09-21 10:28:51,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:28:51,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:28:51,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:51,287 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-09-21 10:28:51,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,430 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-09-21 10:28:51,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:28:51,430 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-09-21 10:28:51,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,431 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:28:51,431 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:28:51,432 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 [2020-09-21 10:28:51,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:28:51,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-09-21 10:28:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:28:51,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-09-21 10:28:51,438 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-09-21 10:28:51,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,438 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-09-21 10:28:51,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:28:51,438 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-09-21 10:28:51,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:28:51,439 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,439 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:51,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:28:51,440 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-09-21 10:28:51,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [308570050] [2020-09-21 10:28:51,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:51,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,625 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:51,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [308570050] [2020-09-21 10:28:51,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:28:51,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911453051] [2020-09-21 10:28:51,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:28:51,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:28:51,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:51,628 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-09-21 10:28:51,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,824 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-09-21 10:28:51,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:28:51,825 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-09-21 10:28:51,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,826 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:28:51,826 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 10:28:51,827 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 [2020-09-21 10:28:51,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 10:28:51,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-09-21 10:28:51,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 10:28:51,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-09-21 10:28:51,833 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-09-21 10:28:51,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,834 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-09-21 10:28:51,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:28:51,834 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-09-21 10:28:51,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 10:28:51,835 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,835 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:51,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:28:51,835 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,836 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-09-21 10:28:51,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399442154] [2020-09-21 10:28:51,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:52,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,039 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:52,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399442154] [2020-09-21 10:28:52,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:52,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:28:52,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904677500] [2020-09-21 10:28:52,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:28:52,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:52,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:28:52,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:28:52,041 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-09-21 10:28:52,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:52,251 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-09-21 10:28:52,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:28:52,251 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-09-21 10:28:52,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:52,252 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:28:52,252 INFO L226 Difference]: Without dead ends: 35 [2020-09-21 10:28:52,253 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 [2020-09-21 10:28:52,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-21 10:28:52,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-09-21 10:28:52,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 10:28:52,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-21 10:28:52,259 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-09-21 10:28:52,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:52,259 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-21 10:28:52,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:28:52,259 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-21 10:28:52,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 10:28:52,261 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:52,261 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:52,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:28:52,262 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:52,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:52,262 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-09-21 10:28:52,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:52,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720520317] [2020-09-21 10:28:52,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:52,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:52,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,478 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:52,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720520317] [2020-09-21 10:28:52,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:52,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:28:52,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581747703] [2020-09-21 10:28:52,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:28:52,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:52,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:28:52,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:52,480 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-09-21 10:28:52,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:52,747 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-09-21 10:28:52,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:28:52,747 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-09-21 10:28:52,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:52,748 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:28:52,748 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:28:52,749 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 [2020-09-21 10:28:52,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:28:52,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-09-21 10:28:52,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:28:52,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-09-21 10:28:52,758 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-09-21 10:28:52,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:52,758 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-09-21 10:28:52,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:28:52,759 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-09-21 10:28:52,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:28:52,759 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:52,759 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:52,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:28:52,760 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:52,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:52,760 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-09-21 10:28:52,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:52,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155493123] [2020-09-21 10:28:52,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:52,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:52,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,000 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:53,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155493123] [2020-09-21 10:28:53,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:53,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:28:53,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674377719] [2020-09-21 10:28:53,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:28:53,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:53,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:28:53,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:53,003 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-09-21 10:28:53,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:53,252 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-09-21 10:28:53,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:28:53,252 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-09-21 10:28:53,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:53,253 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:28:53,253 INFO L226 Difference]: Without dead ends: 39 [2020-09-21 10:28:53,254 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 [2020-09-21 10:28:53,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-21 10:28:53,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-09-21 10:28:53,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:28:53,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-09-21 10:28:53,267 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-09-21 10:28:53,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:53,268 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-09-21 10:28:53,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:28:53,268 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-09-21 10:28:53,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-21 10:28:53,271 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:53,271 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:53,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:28:53,272 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:53,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:53,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-09-21 10:28:53,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:53,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34762552] [2020-09-21 10:28:53,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:53,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:53,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,536 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:53,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34762552] [2020-09-21 10:28:53,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:53,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:28:53,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174514701] [2020-09-21 10:28:53,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:28:53,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:53,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:28:53,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:53,539 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-09-21 10:28:53,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:53,831 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-09-21 10:28:53,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:28:53,832 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-09-21 10:28:53,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:53,833 INFO L225 Difference]: With dead ends: 70 [2020-09-21 10:28:53,833 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:28:53,834 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 [2020-09-21 10:28:53,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:28:53,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-09-21 10:28:53,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 10:28:53,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-09-21 10:28:53,844 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-09-21 10:28:53,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:53,844 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-09-21 10:28:53,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:28:53,844 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-09-21 10:28:53,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-21 10:28:53,845 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:53,845 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:53,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:28:53,845 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:53,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:53,845 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-09-21 10:28:53,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:53,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984916077] [2020-09-21 10:28:53,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:53,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:54,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,144 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:54,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984916077] [2020-09-21 10:28:54,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:54,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:28:54,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744270386] [2020-09-21 10:28:54,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:28:54,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:54,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:28:54,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:54,147 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-09-21 10:28:54,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:54,535 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-09-21 10:28:54,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:28:54,536 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-09-21 10:28:54,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:54,537 INFO L225 Difference]: With dead ends: 74 [2020-09-21 10:28:54,537 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:28:54,538 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 [2020-09-21 10:28:54,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:28:54,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-09-21 10:28:54,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-21 10:28:54,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-09-21 10:28:54,545 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-09-21 10:28:54,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:54,545 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-09-21 10:28:54,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:28:54,546 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-09-21 10:28:54,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-21 10:28:54,546 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:54,547 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:54,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:28:54,547 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:54,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:54,548 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-09-21 10:28:54,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:54,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790495433] [2020-09-21 10:28:54,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:54,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:54,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,896 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:54,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790495433] [2020-09-21 10:28:54,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:54,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:28:54,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643476243] [2020-09-21 10:28:54,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:28:54,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:54,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:28:54,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:28:54,899 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-09-21 10:28:55,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:55,345 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-09-21 10:28:55,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:28:55,346 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-09-21 10:28:55,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:55,347 INFO L225 Difference]: With dead ends: 78 [2020-09-21 10:28:55,347 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 10:28:55,348 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 [2020-09-21 10:28:55,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 10:28:55,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-09-21 10:28:55,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:28:55,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-09-21 10:28:55,353 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-09-21 10:28:55,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:55,353 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-09-21 10:28:55,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:28:55,354 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-09-21 10:28:55,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:28:55,354 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:55,355 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:55,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:28:55,355 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:55,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:55,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-09-21 10:28:55,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:55,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913226307] [2020-09-21 10:28:55,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:55,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:55,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:55,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:55,775 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:55,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913226307] [2020-09-21 10:28:55,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:55,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:28:55,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043457603] [2020-09-21 10:28:55,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:28:55,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:55,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:28:55,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:55,779 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-09-21 10:28:56,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:56,254 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-09-21 10:28:56,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:28:56,255 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-09-21 10:28:56,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:56,255 INFO L225 Difference]: With dead ends: 82 [2020-09-21 10:28:56,255 INFO L226 Difference]: Without dead ends: 47 [2020-09-21 10:28:56,256 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 [2020-09-21 10:28:56,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-09-21 10:28:56,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-09-21 10:28:56,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-21 10:28:56,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-09-21 10:28:56,262 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-09-21 10:28:56,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:56,262 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-09-21 10:28:56,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:28:56,262 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-09-21 10:28:56,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-21 10:28:56,263 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,263 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:28:56,264 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,264 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-09-21 10:28:56,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788681577] [2020-09-21 10:28:56,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:56,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:56,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,642 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:56,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788681577] [2020-09-21 10:28:56,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:56,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:28:56,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455802958] [2020-09-21 10:28:56,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:28:56,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:56,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:28:56,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:28:56,646 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-09-21 10:28:57,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:57,176 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-09-21 10:28:57,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:28:57,176 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-09-21 10:28:57,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:57,177 INFO L225 Difference]: With dead ends: 86 [2020-09-21 10:28:57,177 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:28:57,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:57,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:28:57,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-09-21 10:28:57,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:28:57,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-09-21 10:28:57,189 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-09-21 10:28:57,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:57,190 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-09-21 10:28:57,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:28:57,190 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-09-21 10:28:57,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-21 10:28:57,191 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:57,191 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:57,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:28:57,191 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:57,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:57,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-09-21 10:28:57,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:57,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651279457] [2020-09-21 10:28:57,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:57,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:57,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,641 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:57,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651279457] [2020-09-21 10:28:57,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:57,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:28:57,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919370612] [2020-09-21 10:28:57,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:28:57,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:57,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:28:57,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:57,643 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-09-21 10:28:58,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:58,259 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-09-21 10:28:58,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:28:58,260 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-09-21 10:28:58,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:58,261 INFO L225 Difference]: With dead ends: 90 [2020-09-21 10:28:58,261 INFO L226 Difference]: Without dead ends: 51 [2020-09-21 10:28:58,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:58,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-09-21 10:28:58,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-09-21 10:28:58,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:28:58,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-09-21 10:28:58,271 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-09-21 10:28:58,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:58,272 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-09-21 10:28:58,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:28:58,272 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-09-21 10:28:58,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-09-21 10:28:58,273 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:58,273 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:58,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:28:58,274 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:58,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:58,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-09-21 10:28:58,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:58,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255396351] [2020-09-21 10:28:58,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:58,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:58,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:58,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:58,776 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:58,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255396351] [2020-09-21 10:28:58,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:58,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:28:58,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752968378] [2020-09-21 10:28:58,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:28:58,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:58,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:28:58,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:58,779 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-09-21 10:28:59,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:59,474 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-09-21 10:28:59,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:28:59,474 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-09-21 10:28:59,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:59,475 INFO L225 Difference]: With dead ends: 94 [2020-09-21 10:28:59,475 INFO L226 Difference]: Without dead ends: 53 [2020-09-21 10:28:59,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:28:59,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-21 10:28:59,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-09-21 10:28:59,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 10:28:59,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-09-21 10:28:59,484 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-09-21 10:28:59,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:59,485 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-09-21 10:28:59,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:28:59,487 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-09-21 10:28:59,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-09-21 10:28:59,488 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:59,488 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:59,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:28:59,490 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:59,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:59,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-09-21 10:28:59,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:59,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334628079] [2020-09-21 10:28:59,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:59,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:59,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:00,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:00,008 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:00,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334628079] [2020-09-21 10:29:00,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:00,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:00,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064772308] [2020-09-21 10:29:00,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:00,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:00,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:00,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:00,011 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-09-21 10:29:00,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:00,751 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-09-21 10:29:00,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:29:00,751 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-09-21 10:29:00,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:00,752 INFO L225 Difference]: With dead ends: 98 [2020-09-21 10:29:00,752 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 10:29:00,753 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 [2020-09-21 10:29:00,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 10:29:00,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-09-21 10:29:00,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:29:00,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-09-21 10:29:00,758 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-09-21 10:29:00,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:00,759 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-09-21 10:29:00,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:29:00,759 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-09-21 10:29:00,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-21 10:29:00,759 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:00,760 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:00,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:00,760 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:00,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:00,760 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-09-21 10:29:00,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:00,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69019214] [2020-09-21 10:29:00,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:00,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:01,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:01,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:01,293 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:01,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69019214] [2020-09-21 10:29:01,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:01,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:29:01,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108790335] [2020-09-21 10:29:01,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:29:01,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:01,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:29:01,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:01,297 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-09-21 10:29:02,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:02,146 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-09-21 10:29:02,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:29:02,148 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-09-21 10:29:02,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:02,149 INFO L225 Difference]: With dead ends: 102 [2020-09-21 10:29:02,149 INFO L226 Difference]: Without dead ends: 57 [2020-09-21 10:29:02,150 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 [2020-09-21 10:29:02,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-09-21 10:29:02,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-09-21 10:29:02,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-21 10:29:02,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-09-21 10:29:02,163 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-09-21 10:29:02,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:02,164 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-09-21 10:29:02,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:29:02,165 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-09-21 10:29:02,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-09-21 10:29:02,165 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:02,165 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:02,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:02,166 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:02,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:02,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-09-21 10:29:02,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:02,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622901097] [2020-09-21 10:29:02,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:02,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:02,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:02,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:02,737 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:02,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622901097] [2020-09-21 10:29:02,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:02,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:29:02,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082114575] [2020-09-21 10:29:02,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:29:02,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:02,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:29:02,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:02,739 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-09-21 10:29:03,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:03,659 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-09-21 10:29:03,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:29:03,659 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-09-21 10:29:03,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:03,660 INFO L225 Difference]: With dead ends: 106 [2020-09-21 10:29:03,660 INFO L226 Difference]: Without dead ends: 59 [2020-09-21 10:29:03,661 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 [2020-09-21 10:29:03,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-21 10:29:03,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-09-21 10:29:03,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-21 10:29:03,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-09-21 10:29:03,666 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-09-21 10:29:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:03,667 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-09-21 10:29:03,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:29:03,667 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-09-21 10:29:03,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-21 10:29:03,667 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:03,667 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:03,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:29:03,668 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:03,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:03,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-09-21 10:29:03,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:03,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450974343] [2020-09-21 10:29:03,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:03,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:04,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:04,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:04,332 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:04,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450974343] [2020-09-21 10:29:04,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:04,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:29:04,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138161869] [2020-09-21 10:29:04,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:29:04,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:04,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:29:04,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:04,334 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-09-21 10:29:05,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:05,318 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-09-21 10:29:05,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:29:05,319 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-09-21 10:29:05,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:05,320 INFO L225 Difference]: With dead ends: 110 [2020-09-21 10:29:05,320 INFO L226 Difference]: Without dead ends: 61 [2020-09-21 10:29:05,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:05,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-21 10:29:05,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-09-21 10:29:05,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-21 10:29:05,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-09-21 10:29:05,326 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-09-21 10:29:05,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:05,326 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-09-21 10:29:05,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:29:05,326 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-09-21 10:29:05,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-09-21 10:29:05,327 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:05,327 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:05,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:29:05,328 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:05,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:05,328 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-09-21 10:29:05,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:05,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [511932493] [2020-09-21 10:29:05,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:05,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:05,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:05,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:05,946 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:05,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [511932493] [2020-09-21 10:29:05,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:05,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:29:05,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389263853] [2020-09-21 10:29:05,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:29:05,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:05,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:29:05,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:05,948 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-09-21 10:29:07,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:07,026 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-09-21 10:29:07,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:29:07,026 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-09-21 10:29:07,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:07,027 INFO L225 Difference]: With dead ends: 114 [2020-09-21 10:29:07,027 INFO L226 Difference]: Without dead ends: 63 [2020-09-21 10:29:07,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:07,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-09-21 10:29:07,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-09-21 10:29:07,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-09-21 10:29:07,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-09-21 10:29:07,032 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-09-21 10:29:07,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:07,032 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-09-21 10:29:07,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:29:07,033 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-09-21 10:29:07,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-09-21 10:29:07,033 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:07,033 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:07,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:29:07,033 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:07,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:07,034 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-09-21 10:29:07,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:07,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277818699] [2020-09-21 10:29:07,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:07,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:07,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:07,736 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:07,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277818699] [2020-09-21 10:29:07,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:07,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:29:07,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649816060] [2020-09-21 10:29:07,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:29:07,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:07,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:29:07,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:07,738 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-09-21 10:29:08,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:08,958 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-09-21 10:29:08,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:29:08,959 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-09-21 10:29:08,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:08,960 INFO L225 Difference]: With dead ends: 118 [2020-09-21 10:29:08,960 INFO L226 Difference]: Without dead ends: 65 [2020-09-21 10:29:08,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:08,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-09-21 10:29:08,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-09-21 10:29:08,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-09-21 10:29:08,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-09-21 10:29:08,966 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-09-21 10:29:08,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:08,966 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-09-21 10:29:08,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:29:08,966 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-09-21 10:29:08,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-09-21 10:29:08,967 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:08,967 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:08,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:29:08,967 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:08,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:08,968 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-09-21 10:29:08,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:08,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883777216] [2020-09-21 10:29:08,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:09,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:09,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:09,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:09,702 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:09,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883777216] [2020-09-21 10:29:09,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:09,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:29:09,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710051414] [2020-09-21 10:29:09,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:29:09,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:09,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:29:09,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:09,704 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-09-21 10:29:11,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:11,046 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-09-21 10:29:11,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:29:11,051 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-09-21 10:29:11,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:11,052 INFO L225 Difference]: With dead ends: 122 [2020-09-21 10:29:11,052 INFO L226 Difference]: Without dead ends: 67 [2020-09-21 10:29:11,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:11,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-09-21 10:29:11,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-09-21 10:29:11,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-09-21 10:29:11,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-09-21 10:29:11,059 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-09-21 10:29:11,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:11,059 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-09-21 10:29:11,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:29:11,059 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-09-21 10:29:11,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-09-21 10:29:11,060 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:11,060 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:11,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:29:11,060 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:11,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:11,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-09-21 10:29:11,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:11,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42221052] [2020-09-21 10:29:11,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:11,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:11,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,879 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:11,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42221052] [2020-09-21 10:29:11,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:11,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:29:11,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446329137] [2020-09-21 10:29:11,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:29:11,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:11,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:29:11,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:11,881 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-09-21 10:29:13,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,330 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-09-21 10:29:13,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:29:13,332 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-09-21 10:29:13,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,333 INFO L225 Difference]: With dead ends: 126 [2020-09-21 10:29:13,333 INFO L226 Difference]: Without dead ends: 69 [2020-09-21 10:29:13,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:13,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-09-21 10:29:13,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-09-21 10:29:13,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-21 10:29:13,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-09-21 10:29:13,338 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-09-21 10:29:13,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,339 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-09-21 10:29:13,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:29:13,339 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-09-21 10:29:13,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-09-21 10:29:13,339 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,339 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:29:13,340 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,340 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-09-21 10:29:13,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1035368218] [2020-09-21 10:29:13,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,125 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1035368218] [2020-09-21 10:29:14,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:29:14,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230869767] [2020-09-21 10:29:14,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:29:14,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:29:14,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:14,127 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-09-21 10:29:15,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,707 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-09-21 10:29:15,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:29:15,707 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-09-21 10:29:15,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,708 INFO L225 Difference]: With dead ends: 130 [2020-09-21 10:29:15,708 INFO L226 Difference]: Without dead ends: 71 [2020-09-21 10:29:15,709 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 [2020-09-21 10:29:15,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-09-21 10:29:15,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-09-21 10:29:15,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-09-21 10:29:15,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-09-21 10:29:15,718 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-09-21 10:29:15,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,718 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-09-21 10:29:15,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:29:15,718 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-09-21 10:29:15,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-09-21 10:29:15,719 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,719 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:29:15,719 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,720 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-09-21 10:29:15,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122379114] [2020-09-21 10:29:15,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122379114] [2020-09-21 10:29:16,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:29:16,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779789091] [2020-09-21 10:29:16,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:29:16,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:29:16,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:16,791 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-09-21 10:29:18,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:18,541 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-09-21 10:29:18,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:29:18,542 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-09-21 10:29:18,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:18,543 INFO L225 Difference]: With dead ends: 134 [2020-09-21 10:29:18,543 INFO L226 Difference]: Without dead ends: 73 [2020-09-21 10:29:18,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:18,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-09-21 10:29:18,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-09-21 10:29:18,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-09-21 10:29:18,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-09-21 10:29:18,549 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-09-21 10:29:18,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:18,550 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-09-21 10:29:18,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:29:18,550 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-09-21 10:29:18,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-21 10:29:18,550 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,551 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:29:18,551 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,551 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-09-21 10:29:18,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782802322] [2020-09-21 10:29:18,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:18,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782802322] [2020-09-21 10:29:19,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:29:19,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089563062] [2020-09-21 10:29:19,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:29:19,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:29:19,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:19,475 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-09-21 10:29:21,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,319 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-09-21 10:29:21,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:29:21,320 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-09-21 10:29:21,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,321 INFO L225 Difference]: With dead ends: 138 [2020-09-21 10:29:21,321 INFO L226 Difference]: Without dead ends: 75 [2020-09-21 10:29:21,323 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 [2020-09-21 10:29:21,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-21 10:29:21,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-09-21 10:29:21,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-09-21 10:29:21,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-09-21 10:29:21,328 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-09-21 10:29:21,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,329 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-09-21 10:29:21,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:29:21,329 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-09-21 10:29:21,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-09-21 10:29:21,330 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,330 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:29:21,330 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-09-21 10:29:21,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005492485] [2020-09-21 10:29:21,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,493 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005492485] [2020-09-21 10:29:22,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:29:22,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002957083] [2020-09-21 10:29:22,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:29:22,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:29:22,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:22,497 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-09-21 10:29:24,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:24,449 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-09-21 10:29:24,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:29:24,450 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-09-21 10:29:24,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:24,450 INFO L225 Difference]: With dead ends: 142 [2020-09-21 10:29:24,451 INFO L226 Difference]: Without dead ends: 77 [2020-09-21 10:29:24,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:24,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-09-21 10:29:24,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-09-21 10:29:24,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-09-21 10:29:24,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-09-21 10:29:24,457 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-09-21 10:29:24,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:24,458 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-09-21 10:29:24,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:29:24,458 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-09-21 10:29:24,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-09-21 10:29:24,459 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:24,459 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:24,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:29:24,459 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:24,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:24,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-09-21 10:29:24,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:24,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160772213] [2020-09-21 10:29:24,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:24,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:25,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,587 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:25,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160772213] [2020-09-21 10:29:25,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:25,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:29:25,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914866216] [2020-09-21 10:29:25,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:29:25,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:25,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:29:25,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:25,590 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-09-21 10:29:27,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:27,749 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-09-21 10:29:27,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:29:27,750 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-09-21 10:29:27,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:27,751 INFO L225 Difference]: With dead ends: 146 [2020-09-21 10:29:27,752 INFO L226 Difference]: Without dead ends: 79 [2020-09-21 10:29:27,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:27,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-09-21 10:29:27,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-09-21 10:29:27,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-09-21 10:29:27,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-09-21 10:29:27,761 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-09-21 10:29:27,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:27,762 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-09-21 10:29:27,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:29:27,762 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-09-21 10:29:27,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-21 10:29:27,763 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:27,763 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:27,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:29:27,763 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:27,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:27,763 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-09-21 10:29:27,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:27,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170259970] [2020-09-21 10:29:27,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:27,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:28,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:28,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:28,920 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:28,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170259970] [2020-09-21 10:29:28,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:28,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:29:28,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107655341] [2020-09-21 10:29:28,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:29:28,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:28,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:29:28,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:28,922 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-09-21 10:29:31,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:31,208 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-09-21 10:29:31,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:29:31,208 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-09-21 10:29:31,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:31,209 INFO L225 Difference]: With dead ends: 150 [2020-09-21 10:29:31,209 INFO L226 Difference]: Without dead ends: 81 [2020-09-21 10:29:31,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:31,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-09-21 10:29:31,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-09-21 10:29:31,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-21 10:29:31,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-09-21 10:29:31,216 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-09-21 10:29:31,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:31,217 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-09-21 10:29:31,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:29:31,217 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-09-21 10:29:31,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-09-21 10:29:31,217 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:31,218 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:31,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:29:31,218 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:31,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:31,218 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-09-21 10:29:31,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:31,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378457971] [2020-09-21 10:29:31,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:31,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:32,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:32,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378457971] [2020-09-21 10:29:32,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:32,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:29:32,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685597216] [2020-09-21 10:29:32,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:29:32,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:32,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:29:32,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:32,474 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-09-21 10:29:34,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:34,907 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-09-21 10:29:34,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:29:34,909 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-09-21 10:29:34,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:34,910 INFO L225 Difference]: With dead ends: 154 [2020-09-21 10:29:34,910 INFO L226 Difference]: Without dead ends: 83 [2020-09-21 10:29:34,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:34,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-09-21 10:29:34,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-09-21 10:29:34,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-09-21 10:29:34,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-09-21 10:29:34,916 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-09-21 10:29:34,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:34,917 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-09-21 10:29:34,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:29:34,917 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-09-21 10:29:34,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-09-21 10:29:34,918 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:34,918 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:34,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:29:34,918 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:34,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:34,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-09-21 10:29:34,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:34,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412396686] [2020-09-21 10:29:34,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:34,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:36,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:36,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412396686] [2020-09-21 10:29:36,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:36,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:29:36,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954761424] [2020-09-21 10:29:36,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:29:36,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:36,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:29:36,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:36,288 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-09-21 10:29:38,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:38,939 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-09-21 10:29:38,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:29:38,940 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-09-21 10:29:38,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:38,941 INFO L225 Difference]: With dead ends: 158 [2020-09-21 10:29:38,942 INFO L226 Difference]: Without dead ends: 85 [2020-09-21 10:29:38,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:38,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-09-21 10:29:38,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-09-21 10:29:38,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-09-21 10:29:38,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-09-21 10:29:38,948 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-09-21 10:29:38,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:38,949 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-09-21 10:29:38,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:29:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-09-21 10:29:38,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-21 10:29:38,950 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:38,950 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:38,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:29:38,950 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:38,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:38,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-09-21 10:29:38,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:38,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10867196] [2020-09-21 10:29:38,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:39,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:40,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:40,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10867196] [2020-09-21 10:29:40,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:40,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:29:40,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495825652] [2020-09-21 10:29:40,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:29:40,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:40,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:29:40,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:40,343 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-09-21 10:29:43,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:43,100 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-09-21 10:29:43,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:29:43,102 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-09-21 10:29:43,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:43,103 INFO L225 Difference]: With dead ends: 162 [2020-09-21 10:29:43,103 INFO L226 Difference]: Without dead ends: 87 [2020-09-21 10:29:43,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:43,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-09-21 10:29:43,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-09-21 10:29:43,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-09-21 10:29:43,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-09-21 10:29:43,110 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-09-21 10:29:43,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:43,110 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-09-21 10:29:43,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:29:43,111 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-09-21 10:29:43,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-09-21 10:29:43,111 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:43,112 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:43,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:29:43,112 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:43,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:43,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-09-21 10:29:43,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:43,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982704174] [2020-09-21 10:29:43,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:43,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:44,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:44,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:44,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:44,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982704174] [2020-09-21 10:29:44,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:44,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:29:44,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916500757] [2020-09-21 10:29:44,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:29:44,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:44,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:29:44,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:44,623 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states.