/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:28:51,172 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:28:51,175 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:28:51,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:28:51,219 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:28:51,220 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:28:51,221 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:28:51,223 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:28:51,225 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:28:51,225 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:28:51,226 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:28:51,228 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:28:51,228 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:28:51,229 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:28:51,230 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:28:51,231 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:28:51,232 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:28:51,233 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:28:51,235 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:28:51,237 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:28:51,238 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:28:51,240 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:28:51,241 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:28:51,242 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:28:51,244 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:28:51,255 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:28:51,259 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:28:51,259 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:28:51,260 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:28:51,305 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:28:51,306 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:28:51,310 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:28:51,310 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:28:51,310 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:28:51,310 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:28:51,311 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:28:51,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:28:51,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:28:51,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:28:51,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:28:51,312 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:28:51,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:28:51,312 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:28:51,312 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:28:51,313 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:28:51,313 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:28:51,313 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:28:51,313 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:28:51,313 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:28:51,314 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:28:51,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:28:51,316 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:28:51,316 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:28:51,316 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:28:51,316 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:28:51,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:28:51,317 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:28:51,317 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:28:51,317 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:28:51,651 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:28:51,672 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:28:51,676 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:28:51,678 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:28:51,680 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:28:51,681 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 21:28:51,759 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc8bd6c5d/cb3e8b813dfc48ba86daaef28f8506b7/FLAG5d1356926 [2020-08-21 21:28:52,235 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:28:52,236 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 21:28:52,242 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc8bd6c5d/cb3e8b813dfc48ba86daaef28f8506b7/FLAG5d1356926 [2020-08-21 21:28:52,653 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc8bd6c5d/cb3e8b813dfc48ba86daaef28f8506b7 [2020-08-21 21:28:52,662 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:28:52,664 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:28:52,665 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:28:52,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:28:52,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:28:52,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:52,673 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@786a7c9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52, skipping insertion in model container [2020-08-21 21:28:52,673 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:52,682 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:28:52,709 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:28:52,948 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:28:52,956 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:28:52,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:28:52,992 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:28:52,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52 WrapperNode [2020-08-21 21:28:52,992 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:28:52,993 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:28:52,993 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:28:52,994 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:28:53,091 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,093 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,105 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,105 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,112 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,118 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,120 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... [2020-08-21 21:28:53,126 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:28:53,127 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:28:53,127 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:28:53,127 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:28:53,128 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:28:53,193 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:28:53,193 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:28:53,193 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:28:53,193 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 21:28:53,194 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 21:28:53,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:28:53,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:28:53,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:28:53,482 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:28:53,483 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 21:28:53,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:28:53 BoogieIcfgContainer [2020-08-21 21:28:53,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:28:53,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:28:53,505 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:28:53,512 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:28:53,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:28:52" (1/3) ... [2020-08-21 21:28:53,513 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66900828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:28:53, skipping insertion in model container [2020-08-21 21:28:53,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:52" (2/3) ... [2020-08-21 21:28:53,514 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66900828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:28:53, skipping insertion in model container [2020-08-21 21:28:53,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:28:53" (3/3) ... [2020-08-21 21:28:53,518 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 21:28:53,538 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:28:53,554 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:28:53,569 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:28:53,590 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:28:53,590 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:28:53,591 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:28:53,591 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:28:53,591 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:28:53,591 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:28:53,591 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:28:53,591 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:28:53,606 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 21:28:53,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:28:53,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:53,613 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:53,613 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:53,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:53,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 21:28:53,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:53,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274915815] [2020-08-21 21:28:53,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:53,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:53,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:53,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:53,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274915815] [2020-08-21 21:28:53,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:53,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:28:53,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514287160] [2020-08-21 21:28:53,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:28:53,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:53,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:28:53,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:28:53,892 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 21:28:54,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:54,049 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 21:28:54,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:28:54,051 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 21:28:54,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:54,062 INFO L225 Difference]: With dead ends: 59 [2020-08-21 21:28:54,063 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:28:54,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:28:54,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:28:54,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 21:28:54,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:28:54,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 21:28:54,106 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 21:28:54,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:54,107 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 21:28:54,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:28:54,108 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 21:28:54,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:28:54,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:54,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:54,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:28:54,110 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:54,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:54,111 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 21:28:54,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:54,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887269211] [2020-08-21 21:28:54,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:54,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:54,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:54,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:54,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887269211] [2020-08-21 21:28:54,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:54,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 21:28:54,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742397943] [2020-08-21 21:28:54,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:28:54,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:54,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:28:54,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:54,295 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 21:28:54,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:54,497 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 21:28:54,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:28:54,498 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 21:28:54,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:54,499 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:28:54,499 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:28:54,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:28:54,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:28:54,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 21:28:54,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:28:54,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 21:28:54,510 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 21:28:54,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:54,511 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 21:28:54,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:28:54,511 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 21:28:54,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:28:54,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:54,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:54,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:28:54,513 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:54,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:54,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 21:28:54,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:54,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240366092] [2020-08-21 21:28:54,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:54,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:54,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:54,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:54,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240366092] [2020-08-21 21:28:54,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:54,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:28:54,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010617056] [2020-08-21 21:28:54,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:28:54,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:54,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:28:54,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:28:54,737 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 21:28:54,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:54,903 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 21:28:54,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:28:54,904 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 21:28:54,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:54,905 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:28:54,905 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:28:54,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:28:54,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:28:54,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 21:28:54,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:28:54,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 21:28:54,913 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 21:28:54,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:54,913 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 21:28:54,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:28:54,914 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 21:28:54,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:28:54,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:54,915 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:54,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:28:54,915 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:54,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:54,916 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 21:28:54,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:54,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112132656] [2020-08-21 21:28:54,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:54,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:54,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:55,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:55,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112132656] [2020-08-21 21:28:55,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:55,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:28:55,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270322586] [2020-08-21 21:28:55,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:28:55,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:55,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:28:55,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:28:55,159 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 21:28:55,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:55,321 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 21:28:55,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:28:55,321 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 21:28:55,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:55,322 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:28:55,322 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:28:55,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:28:55,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:28:55,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 21:28:55,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:28:55,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 21:28:55,330 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 21:28:55,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:55,330 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 21:28:55,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:28:55,331 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 21:28:55,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:28:55,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:55,332 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:55,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:28:55,333 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:55,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:55,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 21:28:55,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:55,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739809133] [2020-08-21 21:28:55,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:55,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:55,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,563 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:55,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739809133] [2020-08-21 21:28:55,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:55,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:28:55,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586901255] [2020-08-21 21:28:55,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:28:55,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:55,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:28:55,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:28:55,566 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 21:28:55,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:55,751 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 21:28:55,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:28:55,752 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 21:28:55,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:55,753 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:28:55,753 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:28:55,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:28:55,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:28:55,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 21:28:55,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:28:55,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 21:28:55,760 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 21:28:55,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:55,761 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 21:28:55,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:28:55,761 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 21:28:55,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:28:55,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:55,762 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:55,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:28:55,762 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:55,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:55,763 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 21:28:55,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:55,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1387051938] [2020-08-21 21:28:55,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:55,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:55,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:55,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,988 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:55,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1387051938] [2020-08-21 21:28:55,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:55,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:28:55,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3684607] [2020-08-21 21:28:55,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:28:55,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:55,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:28:55,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:28:55,991 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 21:28:56,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:56,159 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 21:28:56,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:28:56,159 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 21:28:56,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:56,160 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:28:56,160 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:28:56,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:28:56,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:28:56,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 21:28:56,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:28:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 21:28:56,167 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 21:28:56,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:56,167 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 21:28:56,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:28:56,168 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 21:28:56,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:28:56,169 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:56,169 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:56,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:28:56,169 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:56,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:56,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 21:28:56,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:56,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137387817] [2020-08-21 21:28:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:56,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:56,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,451 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:56,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137387817] [2020-08-21 21:28:56,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:56,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:28:56,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153821081] [2020-08-21 21:28:56,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:28:56,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:56,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:28:56,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:28:56,453 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 21:28:56,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:56,648 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 21:28:56,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:28:56,648 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 21:28:56,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:56,649 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:28:56,649 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:28:56,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:28:56,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:28:56,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 21:28:56,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:28:56,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 21:28:56,659 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 21:28:56,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:56,661 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 21:28:56,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:28:56,661 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 21:28:56,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:28:56,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:56,665 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:56,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:28:56,665 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:56,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:56,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 21:28:56,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:56,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562256113] [2020-08-21 21:28:56,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:56,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:56,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:56,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,027 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:57,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562256113] [2020-08-21 21:28:57,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:57,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:28:57,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541418361] [2020-08-21 21:28:57,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:28:57,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:57,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:28:57,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:28:57,030 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 21:28:57,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:57,247 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 21:28:57,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:28:57,247 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 21:28:57,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:57,248 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:28:57,248 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:28:57,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:28:57,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:28:57,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 21:28:57,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:28:57,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 21:28:57,255 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 21:28:57,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:57,255 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 21:28:57,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:28:57,256 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 21:28:57,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:28:57,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:57,257 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:57,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:28:57,257 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:57,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:57,257 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 21:28:57,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:57,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340419675] [2020-08-21 21:28:57,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:57,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:57,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:57,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,649 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:57,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340419675] [2020-08-21 21:28:57,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:57,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:28:57,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845320076] [2020-08-21 21:28:57,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:28:57,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:57,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:28:57,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:28:57,660 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 21:28:57,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:57,865 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 21:28:57,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:28:57,866 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 21:28:57,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:57,867 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:28:57,867 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:28:57,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:28:57,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:28:57,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 21:28:57,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:28:57,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 21:28:57,873 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 21:28:57,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:57,874 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 21:28:57,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:28:57,874 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 21:28:57,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:28:57,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:57,875 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:57,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:28:57,875 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:57,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:57,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 21:28:57,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:57,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751248155] [2020-08-21 21:28:57,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:57,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:57,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:57,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,255 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:58,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751248155] [2020-08-21 21:28:58,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:58,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:28:58,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568875578] [2020-08-21 21:28:58,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:28:58,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:58,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:28:58,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:28:58,259 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 21:28:58,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:58,508 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 21:28:58,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:28:58,508 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 21:28:58,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:58,509 INFO L225 Difference]: With dead ends: 64 [2020-08-21 21:28:58,509 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:28:58,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:28:58,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:28:58,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 21:28:58,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:28:58,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 21:28:58,515 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 21:28:58,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:58,516 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 21:28:58,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:28:58,516 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 21:28:58,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:28:58,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:58,517 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:58,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:28:58,517 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:58,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:58,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 21:28:58,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:58,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043005194] [2020-08-21 21:28:58,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:58,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:58,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:58,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,573 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 21:28:58,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043005194] [2020-08-21 21:28:58,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:58,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:28:58,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314622640] [2020-08-21 21:28:58,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:28:58,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:58,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:28:58,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:28:58,575 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 21:28:58,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:58,652 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 21:28:58,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:28:58,653 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 21:28:58,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:58,655 INFO L225 Difference]: With dead ends: 65 [2020-08-21 21:28:58,655 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 21:28:58,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:58,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 21:28:58,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 21:28:58,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:28:58,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 21:28:58,665 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 21:28:58,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:58,665 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 21:28:58,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:28:58,665 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 21:28:58,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:28:58,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:58,666 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:58,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:28:58,667 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:58,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:58,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 21:28:58,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:58,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069140857] [2020-08-21 21:28:58,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:58,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:58,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,748 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 21:28:58,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069140857] [2020-08-21 21:28:58,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:58,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:28:58,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075842944] [2020-08-21 21:28:58,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:28:58,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:58,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:28:58,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:58,750 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 21:28:58,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:58,846 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 21:28:58,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:28:58,846 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 21:28:58,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:58,847 INFO L225 Difference]: With dead ends: 73 [2020-08-21 21:28:58,847 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 21:28:58,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:28:58,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 21:28:58,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 21:28:58,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:28:58,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 21:28:58,853 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 21:28:58,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:58,854 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 21:28:58,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:28:58,854 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 21:28:58,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:28:58,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:58,855 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:58,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:28:58,855 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:58,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:58,856 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 21:28:58,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:58,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988204799] [2020-08-21 21:28:58,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:58,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:58,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:58,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,915 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 21:28:58,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988204799] [2020-08-21 21:28:58,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:58,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:28:58,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202232772] [2020-08-21 21:28:58,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:28:58,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:58,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:28:58,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:28:58,917 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 21:28:58,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:58,993 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 21:28:58,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:28:58,994 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 21:28:58,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:58,995 INFO L225 Difference]: With dead ends: 69 [2020-08-21 21:28:58,995 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:28:58,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:58,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:28:59,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:28:59,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:28:59,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 21:28:59,001 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 21:28:59,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:59,001 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 21:28:59,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:28:59,002 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 21:28:59,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:28:59,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:59,002 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:59,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:28:59,003 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:59,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:59,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 21:28:59,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:59,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172084442] [2020-08-21 21:28:59,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:59,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:59,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:59,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,532 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:28:59,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172084442] [2020-08-21 21:28:59,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:59,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:28:59,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153398414] [2020-08-21 21:28:59,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:28:59,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:59,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:28:59,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:28:59,538 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 21:28:59,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:59,750 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 21:28:59,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:28:59,750 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 21:28:59,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:59,751 INFO L225 Difference]: With dead ends: 74 [2020-08-21 21:28:59,751 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:28:59,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:28:59,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:28:59,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 21:28:59,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:28:59,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 21:28:59,764 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 21:28:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:59,765 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 21:28:59,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:28:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 21:28:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:28:59,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:59,766 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:59,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:28:59,766 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:59,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:59,767 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 21:28:59,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:59,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900366246] [2020-08-21 21:28:59,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:59,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:59,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:59,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,273 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:00,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900366246] [2020-08-21 21:29:00,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:00,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:29:00,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269237009] [2020-08-21 21:29:00,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:29:00,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:00,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:29:00,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:00,275 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 21:29:00,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:00,492 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 21:29:00,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:29:00,492 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 21:29:00,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:00,493 INFO L225 Difference]: With dead ends: 76 [2020-08-21 21:29:00,493 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:29:00,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:00,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:29:00,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 21:29:00,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:29:00,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 21:29:00,502 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 21:29:00,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:00,503 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 21:29:00,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:29:00,503 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 21:29:00,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:29:00,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:00,505 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:00,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:29:00,505 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:00,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:00,505 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 21:29:00,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:00,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859216108] [2020-08-21 21:29:00,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:00,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:00,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:00,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:01,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859216108] [2020-08-21 21:29:01,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:01,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:29:01,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72188390] [2020-08-21 21:29:01,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:29:01,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:01,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:29:01,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:01,065 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 21:29:01,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:01,331 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 21:29:01,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:29:01,331 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 21:29:01,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:01,332 INFO L225 Difference]: With dead ends: 78 [2020-08-21 21:29:01,332 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:29:01,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:01,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:29:01,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 21:29:01,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:29:01,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 21:29:01,350 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 21:29:01,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:01,350 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 21:29:01,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:29:01,351 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 21:29:01,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:29:01,352 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:01,352 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:01,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:29:01,352 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:01,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:01,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 21:29:01,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:01,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667453364] [2020-08-21 21:29:01,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:01,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:01,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:01,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,954 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:01,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667453364] [2020-08-21 21:29:01,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:01,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:29:01,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531197478] [2020-08-21 21:29:01,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:29:01,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:01,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:29:01,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:01,955 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 21:29:02,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:02,230 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 21:29:02,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:02,230 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 21:29:02,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:02,231 INFO L225 Difference]: With dead ends: 80 [2020-08-21 21:29:02,232 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:29:02,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:02,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:29:02,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 21:29:02,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:29:02,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 21:29:02,238 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 21:29:02,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:02,239 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 21:29:02,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:02,239 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 21:29:02,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:29:02,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:02,240 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:02,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:02,240 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:02,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:02,240 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 21:29:02,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:02,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347895107] [2020-08-21 21:29:02,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:02,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:02,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:02,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,838 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:02,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347895107] [2020-08-21 21:29:02,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:02,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:02,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113775244] [2020-08-21 21:29:02,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:02,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:02,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:02,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:02,840 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 21:29:03,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:03,113 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 21:29:03,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:03,114 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 21:29:03,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:03,115 INFO L225 Difference]: With dead ends: 82 [2020-08-21 21:29:03,115 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 21:29:03,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:03,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 21:29:03,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 21:29:03,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 21:29:03,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 21:29:03,120 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 21:29:03,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:03,120 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 21:29:03,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:03,120 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 21:29:03,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:29:03,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:03,121 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:03,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:03,122 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:03,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:03,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 21:29:03,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:03,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855033767] [2020-08-21 21:29:03,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:03,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:03,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:03,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:03,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:03,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:03,796 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:03,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855033767] [2020-08-21 21:29:03,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:03,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:03,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494071117] [2020-08-21 21:29:03,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:03,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:03,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:03,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:03,798 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 21:29:04,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:04,058 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 21:29:04,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:04,064 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 21:29:04,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:04,065 INFO L225 Difference]: With dead ends: 84 [2020-08-21 21:29:04,065 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 21:29:04,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:04,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 21:29:04,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 21:29:04,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 21:29:04,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 21:29:04,073 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 21:29:04,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:04,074 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 21:29:04,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:04,076 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 21:29:04,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:29:04,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:04,077 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:04,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:29:04,077 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:04,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:04,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 21:29:04,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:04,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152728399] [2020-08-21 21:29:04,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:04,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:04,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:04,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:04,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:04,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,047 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:05,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152728399] [2020-08-21 21:29:05,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:05,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:29:05,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029090521] [2020-08-21 21:29:05,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:29:05,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:05,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:29:05,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:05,053 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 21:29:05,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:05,320 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 21:29:05,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:29:05,320 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 21:29:05,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:05,321 INFO L225 Difference]: With dead ends: 86 [2020-08-21 21:29:05,321 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 21:29:05,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:05,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 21:29:05,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 21:29:05,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 21:29:05,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 21:29:05,333 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 21:29:05,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:05,333 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 21:29:05,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:29:05,334 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 21:29:05,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 21:29:05,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:05,337 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:05,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:29:05,338 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:05,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:05,338 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 21:29:05,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:05,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638028170] [2020-08-21 21:29:05,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:05,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:05,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:05,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,120 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:06,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638028170] [2020-08-21 21:29:06,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:06,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:29:06,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115100730] [2020-08-21 21:29:06,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:29:06,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:06,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:29:06,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:06,122 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 21:29:06,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:06,449 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 21:29:06,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:29:06,449 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 21:29:06,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:06,450 INFO L225 Difference]: With dead ends: 88 [2020-08-21 21:29:06,451 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 21:29:06,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:06,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 21:29:06,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 21:29:06,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 21:29:06,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 21:29:06,458 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 21:29:06,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:06,458 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 21:29:06,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:29:06,458 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 21:29:06,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 21:29:06,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:06,459 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:06,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:29:06,460 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:06,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:06,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 21:29:06,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:06,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379653528] [2020-08-21 21:29:06,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:06,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:06,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:06,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:07,303 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:07,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379653528] [2020-08-21 21:29:07,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:07,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:29:07,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692898062] [2020-08-21 21:29:07,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:29:07,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:07,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:29:07,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:07,305 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 21:29:07,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:07,650 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 21:29:07,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:29:07,653 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 21:29:07,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:07,654 INFO L225 Difference]: With dead ends: 90 [2020-08-21 21:29:07,654 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 21:29:07,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:07,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 21:29:07,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 21:29:07,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 21:29:07,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 21:29:07,661 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 21:29:07,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:07,662 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 21:29:07,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:29:07,662 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 21:29:07,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 21:29:07,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:07,663 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:07,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:29:07,663 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:07,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:07,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 21:29:07,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:07,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818853314] [2020-08-21 21:29:07,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:07,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:07,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:07,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:07,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:07,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:08,762 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:08,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818853314] [2020-08-21 21:29:08,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:08,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:29:08,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669841691] [2020-08-21 21:29:08,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:29:08,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:08,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:29:08,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:08,765 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 21:29:09,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:09,052 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 21:29:09,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:29:09,052 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 21:29:09,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:09,053 INFO L225 Difference]: With dead ends: 92 [2020-08-21 21:29:09,053 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 21:29:09,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:09,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 21:29:09,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 21:29:09,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 21:29:09,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 21:29:09,059 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 21:29:09,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:09,059 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 21:29:09,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:29:09,059 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 21:29:09,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 21:29:09,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:09,060 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:09,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:29:09,061 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:09,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:09,061 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 21:29:09,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:09,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594813545] [2020-08-21 21:29:09,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:09,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:09,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:09,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:09,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:09,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:10,014 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:10,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594813545] [2020-08-21 21:29:10,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:10,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:29:10,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918977901] [2020-08-21 21:29:10,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:29:10,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:10,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:29:10,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:10,016 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 21:29:10,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:10,356 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 21:29:10,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:29:10,356 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 21:29:10,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:10,357 INFO L225 Difference]: With dead ends: 94 [2020-08-21 21:29:10,358 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 21:29:10,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:10,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 21:29:10,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 21:29:10,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 21:29:10,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 21:29:10,367 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 21:29:10,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:10,367 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 21:29:10,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:29:10,368 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 21:29:10,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 21:29:10,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:10,368 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:10,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:29:10,371 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:10,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:10,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 21:29:10,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:10,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358588925] [2020-08-21 21:29:10,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:10,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:10,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:10,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:10,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:10,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,465 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:11,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358588925] [2020-08-21 21:29:11,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:11,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:29:11,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123380392] [2020-08-21 21:29:11,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:29:11,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:11,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:29:11,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:11,467 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 21:29:11,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:11,837 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 21:29:11,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:29:11,837 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 21:29:11,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:11,839 INFO L225 Difference]: With dead ends: 96 [2020-08-21 21:29:11,839 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 21:29:11,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:11,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 21:29:11,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 21:29:11,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 21:29:11,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 21:29:11,845 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 21:29:11,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:11,845 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 21:29:11,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:29:11,845 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 21:29:11,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 21:29:11,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:11,846 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:11,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:29:11,846 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:11,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:11,847 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 21:29:11,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:11,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726944058] [2020-08-21 21:29:11,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:11,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:11,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:11,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:12,939 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:12,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726944058] [2020-08-21 21:29:12,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:12,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:29:12,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013006724] [2020-08-21 21:29:12,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:29:12,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:12,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:29:12,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:12,941 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 21:29:13,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:13,178 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 21:29:13,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:29:13,179 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 21:29:13,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:13,179 INFO L225 Difference]: With dead ends: 98 [2020-08-21 21:29:13,179 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 21:29:13,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:13,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 21:29:13,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 21:29:13,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 21:29:13,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 21:29:13,184 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 21:29:13,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:13,184 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 21:29:13,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:29:13,184 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 21:29:13,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 21:29:13,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:13,185 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:13,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:29:13,186 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:13,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:13,186 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 21:29:13,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:13,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628177094] [2020-08-21 21:29:13,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:13,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:13,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:13,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:13,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:13,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,396 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:14,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628177094] [2020-08-21 21:29:14,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:14,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:29:14,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240624364] [2020-08-21 21:29:14,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:29:14,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:14,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:29:14,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:14,398 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 21:29:14,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:14,701 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 21:29:14,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:29:14,702 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 21:29:14,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:14,703 INFO L225 Difference]: With dead ends: 100 [2020-08-21 21:29:14,703 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 21:29:14,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:14,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 21:29:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 21:29:14,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 21:29:14,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 21:29:14,709 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 21:29:14,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:14,709 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 21:29:14,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:29:14,710 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 21:29:14,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 21:29:14,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:14,710 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:14,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:29:14,711 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:14,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:14,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 21:29:14,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:14,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343797211] [2020-08-21 21:29:14,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:14,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:14,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:14,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:15,940 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:15,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343797211] [2020-08-21 21:29:15,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:15,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:29:15,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837191632] [2020-08-21 21:29:15,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:29:15,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:15,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:29:15,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:15,942 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 21:29:16,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:16,327 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 21:29:16,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:29:16,328 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 21:29:16,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:16,329 INFO L225 Difference]: With dead ends: 102 [2020-08-21 21:29:16,329 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 21:29:16,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:16,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 21:29:16,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 21:29:16,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 21:29:16,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 21:29:16,336 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 21:29:16,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:16,336 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 21:29:16,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:29:16,336 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 21:29:16,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 21:29:16,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:16,337 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:16,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:29:16,338 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:16,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:16,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 21:29:16,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:16,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208930869] [2020-08-21 21:29:16,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:16,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:16,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:16,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:16,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:16,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:17,732 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:17,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208930869] [2020-08-21 21:29:17,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:17,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:29:17,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745059273] [2020-08-21 21:29:17,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:29:17,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:17,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:29:17,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:17,734 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 21:29:18,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:18,041 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 21:29:18,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:29:18,041 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 21:29:18,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:18,042 INFO L225 Difference]: With dead ends: 104 [2020-08-21 21:29:18,043 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 21:29:18,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:18,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 21:29:18,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 21:29:18,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 21:29:18,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 21:29:18,048 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 21:29:18,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:18,049 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 21:29:18,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:29:18,049 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 21:29:18,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 21:29:18,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:18,050 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:18,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:29:18,050 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:18,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:18,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 21:29:18,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:18,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371711881] [2020-08-21 21:29:18,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:18,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:18,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:18,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:18,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:18,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:19,457 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:19,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371711881] [2020-08-21 21:29:19,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:19,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:29:19,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936975963] [2020-08-21 21:29:19,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:29:19,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:19,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:29:19,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:19,459 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 21:29:19,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:19,865 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 21:29:19,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:29:19,866 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 21:29:19,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:19,866 INFO L225 Difference]: With dead ends: 106 [2020-08-21 21:29:19,867 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 21:29:19,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:29:19,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 21:29:19,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 21:29:19,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 21:29:19,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 21:29:19,872 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 21:29:19,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:19,872 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 21:29:19,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:29:19,872 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 21:29:19,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 21:29:19,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:19,873 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:19,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:29:19,874 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:19,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:19,874 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 21:29:19,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:19,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660209375] [2020-08-21 21:29:19,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:19,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:19,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:19,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:19,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:19,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:21,338 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:21,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660209375] [2020-08-21 21:29:21,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:21,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:29:21,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566366811] [2020-08-21 21:29:21,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:29:21,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:21,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:29:21,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:21,341 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 21:29:21,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:21,780 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 21:29:21,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:29:21,785 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 21:29:21,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:21,786 INFO L225 Difference]: With dead ends: 108 [2020-08-21 21:29:21,786 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 21:29:21,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:29:21,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 21:29:21,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 21:29:21,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 21:29:21,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 21:29:21,792 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 21:29:21,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:21,792 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 21:29:21,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:29:21,792 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 21:29:21,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 21:29:21,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:21,793 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:21,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:29:21,793 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:21,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:21,794 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 21:29:21,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:21,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453353087] [2020-08-21 21:29:21,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:21,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:21,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:21,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:21,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:21,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:23,342 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:23,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453353087] [2020-08-21 21:29:23,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:23,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:29:23,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196327634] [2020-08-21 21:29:23,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:29:23,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:23,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:29:23,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:23,344 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 21:29:23,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:23,786 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 21:29:23,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:29:23,787 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 21:29:23,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:23,788 INFO L225 Difference]: With dead ends: 110 [2020-08-21 21:29:23,788 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 21:29:23,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:29:23,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 21:29:23,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 21:29:23,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 21:29:23,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 21:29:23,795 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 21:29:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:23,795 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 21:29:23,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:29:23,795 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 21:29:23,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 21:29:23,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:23,796 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:23,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:29:23,796 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:23,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:23,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 21:29:23,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:23,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013149756] [2020-08-21 21:29:23,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:23,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:23,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:23,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:23,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:23,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:25,400 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:25,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013149756] [2020-08-21 21:29:25,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:25,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:29:25,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12750763] [2020-08-21 21:29:25,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:29:25,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:25,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:29:25,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:29:25,404 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 21:29:25,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:25,879 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 21:29:25,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:29:25,879 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 21:29:25,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:25,880 INFO L225 Difference]: With dead ends: 112 [2020-08-21 21:29:25,881 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 21:29:25,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:29:25,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 21:29:25,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 21:29:25,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 21:29:25,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 21:29:25,886 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 21:29:25,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:25,886 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 21:29:25,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:29:25,886 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 21:29:25,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 21:29:25,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:25,887 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:25,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:29:25,887 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:25,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:25,888 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 21:29:25,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:25,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797615650] [2020-08-21 21:29:25,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:25,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:25,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:25,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:25,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:25,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:27,612 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:27,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797615650] [2020-08-21 21:29:27,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:27,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:29:27,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315870080] [2020-08-21 21:29:27,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:29:27,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:27,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:29:27,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:29:27,614 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 21:29:28,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:28,122 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 21:29:28,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:29:28,123 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 21:29:28,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:28,124 INFO L225 Difference]: With dead ends: 114 [2020-08-21 21:29:28,124 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 21:29:28,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:29:28,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 21:29:28,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 21:29:28,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 21:29:28,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 21:29:28,129 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 21:29:28,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:28,129 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 21:29:28,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:29:28,130 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 21:29:28,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 21:29:28,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:28,130 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:28,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:29:28,131 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:28,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:28,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 21:29:28,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:28,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124550610] [2020-08-21 21:29:28,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:28,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:28,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:28,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:29,929 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:29,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124550610] [2020-08-21 21:29:29,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:29,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:29:29,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876503279] [2020-08-21 21:29:29,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:29:29,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:29,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:29:29,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:29:29,931 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 21:29:30,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,288 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 21:29:30,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:29:30,289 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 21:29:30,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,290 INFO L225 Difference]: With dead ends: 116 [2020-08-21 21:29:30,290 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 21:29:30,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:29:30,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 21:29:30,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 21:29:30,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 21:29:30,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 21:29:30,297 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 21:29:30,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,297 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 21:29:30,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:29:30,298 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 21:29:30,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 21:29:30,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,298 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:29:30,299 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:30,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:30,299 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 21:29:30,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:30,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091104206] [2020-08-21 21:29:30,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:30,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:30,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:30,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,199 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:32,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091104206] [2020-08-21 21:29:32,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:32,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:29:32,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479624757] [2020-08-21 21:29:32,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:29:32,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:32,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:29:32,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:29:32,201 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 21:29:32,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:32,709 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 21:29:32,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:29:32,709 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 21:29:32,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:32,711 INFO L225 Difference]: With dead ends: 118 [2020-08-21 21:29:32,711 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 21:29:32,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:29:32,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 21:29:32,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 21:29:32,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 21:29:32,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 21:29:32,717 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 21:29:32,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:32,718 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 21:29:32,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:29:32,718 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 21:29:32,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 21:29:32,719 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:32,719 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:32,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:29:32,719 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:32,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:32,719 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 21:29:32,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:32,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613169187] [2020-08-21 21:29:32,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:32,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:32,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:32,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:34,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:34,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613169187] [2020-08-21 21:29:34,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:34,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:29:34,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61882203] [2020-08-21 21:29:34,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:29:34,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:34,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:29:34,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:29:34,734 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 21:29:35,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:35,177 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 21:29:35,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:29:35,178 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 21:29:35,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:35,179 INFO L225 Difference]: With dead ends: 120 [2020-08-21 21:29:35,179 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 21:29:35,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:29:35,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 21:29:35,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 21:29:35,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 21:29:35,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 21:29:35,185 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 21:29:35,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:35,186 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 21:29:35,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:29:35,186 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 21:29:35,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 21:29:35,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:35,187 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:35,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:29:35,187 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:35,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:35,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 21:29:35,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:35,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616269810] [2020-08-21 21:29:35,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:35,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:35,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:35,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:37,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:37,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616269810] [2020-08-21 21:29:37,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:37,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:29:37,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594308108] [2020-08-21 21:29:37,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:29:37,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:37,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:29:37,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:29:37,328 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 21:29:37,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:37,710 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 21:29:37,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:29:37,711 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 21:29:37,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:37,712 INFO L225 Difference]: With dead ends: 122 [2020-08-21 21:29:37,712 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 21:29:37,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:29:37,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 21:29:37,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 21:29:37,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 21:29:37,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 21:29:37,718 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 21:29:37,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:37,719 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 21:29:37,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:29:37,719 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 21:29:37,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 21:29:37,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:37,720 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:37,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:29:37,720 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:37,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:37,721 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 21:29:37,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:37,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013708654] [2020-08-21 21:29:37,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:37,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:37,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:37,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:37,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:37,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:39,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:39,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013708654] [2020-08-21 21:29:39,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:39,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:29:39,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088426362] [2020-08-21 21:29:39,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:29:39,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:39,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:29:39,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:29:39,879 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 21:29:40,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:40,221 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 21:29:40,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:29:40,221 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 21:29:40,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:40,222 INFO L225 Difference]: With dead ends: 124 [2020-08-21 21:29:40,223 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 21:29:40,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:29:40,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 21:29:40,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 21:29:40,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 21:29:40,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 21:29:40,229 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 21:29:40,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:40,230 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 21:29:40,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:29:40,230 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 21:29:40,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 21:29:40,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:40,231 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:40,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:29:40,231 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:40,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:40,232 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 21:29:40,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:40,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313751206] [2020-08-21 21:29:40,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:40,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:40,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:40,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:40,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:40,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:42,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:42,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313751206] [2020-08-21 21:29:42,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:42,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:29:42,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373543337] [2020-08-21 21:29:42,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:29:42,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:42,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:29:42,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:29:42,504 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 21:29:42,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:42,897 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 21:29:42,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:29:42,898 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 21:29:42,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:42,899 INFO L225 Difference]: With dead ends: 126 [2020-08-21 21:29:42,899 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 21:29:42,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:29:42,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 21:29:42,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 21:29:42,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 21:29:42,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 21:29:42,905 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 21:29:42,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:42,905 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 21:29:42,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:29:42,906 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 21:29:42,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 21:29:42,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:42,906 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:42,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:29:42,906 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:42,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:42,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 21:29:42,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:42,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434435669] [2020-08-21 21:29:42,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:42,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:42,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:42,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:42,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:43,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:45,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:45,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434435669] [2020-08-21 21:29:45,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:45,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:29:45,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735329197] [2020-08-21 21:29:45,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:29:45,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:45,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:29:45,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:29:45,339 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 21:29:45,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:45,782 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 21:29:45,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:29:45,783 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 21:29:45,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:45,784 INFO L225 Difference]: With dead ends: 128 [2020-08-21 21:29:45,784 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 21:29:45,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:29:45,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 21:29:45,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 21:29:45,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 21:29:45,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 21:29:45,791 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 21:29:45,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:45,791 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 21:29:45,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:29:45,792 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 21:29:45,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 21:29:45,792 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:45,792 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:45,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:29:45,793 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:45,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:45,793 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 21:29:45,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:45,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031714929] [2020-08-21 21:29:45,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:45,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:45,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:45,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:45,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:45,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:48,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031714929] [2020-08-21 21:29:48,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:48,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:29:48,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32425296] [2020-08-21 21:29:48,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:29:48,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:48,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:29:48,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:29:48,349 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 21:29:48,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:48,946 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 21:29:48,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:29:48,946 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 21:29:48,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:48,947 INFO L225 Difference]: With dead ends: 130 [2020-08-21 21:29:48,948 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 21:29:48,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:29:48,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 21:29:48,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 21:29:48,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 21:29:48,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 21:29:48,954 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 21:29:48,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:48,955 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 21:29:48,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:29:48,955 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 21:29:48,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 21:29:48,956 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:48,956 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:48,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 21:29:48,956 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:48,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:48,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 21:29:48,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:48,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546525986] [2020-08-21 21:29:48,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:48,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:49,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat