/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:14:04,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:14:04,820 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:14:04,844 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:14:04,844 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:14:04,845 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:14:04,847 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:14:04,849 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:14:04,853 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:14:04,854 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:14:04,858 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:14:04,859 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:14:04,860 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:14:04,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:14:04,861 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:14:04,866 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:14:04,866 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:14:04,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:14:04,868 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:14:04,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:14:04,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:14:04,872 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:14:04,873 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:14:04,874 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:14:04,876 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:14:04,884 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:14:04,884 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:14:04,885 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:14:04,886 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 21:14:04,908 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:14:04,908 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:14:04,909 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:14:04,909 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:14:04,909 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:14:04,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:14:04,910 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:14:04,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:14:04,910 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:14:04,910 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:14:04,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:14:04,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:14:04,911 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:14:04,911 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:14:04,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:14:04,912 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:14:04,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:14:04,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:14:04,912 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:14:04,913 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:14:04,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:14:04,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:04,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:14:04,913 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:14:04,914 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:14:04,914 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:14:04,914 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:14:04,914 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:14:04,914 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:14:04,915 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:14:05,235 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:14:05,255 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:14:05,258 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:14:05,260 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:14:05,260 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:14:05,261 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 21:14:05,312 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/090183b6e/68b08fda37a54ff59b57c4c579bed2e4/FLAG31442bf02 [2020-08-18 21:14:05,753 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:14:05,757 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 21:14:05,763 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/090183b6e/68b08fda37a54ff59b57c4c579bed2e4/FLAG31442bf02 [2020-08-18 21:14:06,138 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/090183b6e/68b08fda37a54ff59b57c4c579bed2e4 [2020-08-18 21:14:06,148 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:14:06,150 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:14:06,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:06,154 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:14:06,158 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:14:06,159 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,162 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45e0ef97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06, skipping insertion in model container [2020-08-18 21:14:06,163 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,172 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:14:06,190 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:14:06,434 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:06,442 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:14:06,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:06,480 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:14:06,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06 WrapperNode [2020-08-18 21:14:06,482 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:06,483 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:14:06,483 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:14:06,483 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:14:06,499 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,501 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,507 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,507 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,511 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,517 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,518 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,598 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:14:06,598 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:14:06,598 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:14:06,601 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:14:06,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:06,662 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:14:06,662 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:14:06,662 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:14:06,662 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:14:06,662 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:14:06,662 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:14:06,663 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:14:06,663 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:14:06,663 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:14:06,840 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:14:06,840 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 21:14:06,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:06 BoogieIcfgContainer [2020-08-18 21:14:06,844 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:14:06,845 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:14:06,846 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:14:06,849 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:14:06,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:14:06" (1/3) ... [2020-08-18 21:14:06,850 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547e2be5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:06, skipping insertion in model container [2020-08-18 21:14:06,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (2/3) ... [2020-08-18 21:14:06,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547e2be5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:06, skipping insertion in model container [2020-08-18 21:14:06,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:06" (3/3) ... [2020-08-18 21:14:06,853 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-18 21:14:06,862 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:14:06,868 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:14:06,879 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:14:06,902 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:14:06,902 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:14:06,902 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:14:06,902 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:14:06,902 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:14:06,903 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:14:06,903 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:14:06,903 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:14:06,919 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 21:14:06,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 21:14:06,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,925 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,926 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 21:14:06,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124065359] [2020-08-18 21:14:06,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124065359] [2020-08-18 21:14:07,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:07,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:14:07,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36968491] [2020-08-18 21:14:07,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:14:07,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:14:07,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:07,201 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 21:14:07,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,248 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 21:14:07,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:14:07,250 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 21:14:07,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,258 INFO L225 Difference]: With dead ends: 29 [2020-08-18 21:14:07,258 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 21:14:07,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:07,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 21:14:07,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 21:14:07,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 21:14:07,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 21:14:07,298 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 21:14:07,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,298 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 21:14:07,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:14:07,299 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 21:14:07,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 21:14:07,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,300 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:14:07,300 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 21:14:07,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611727817] [2020-08-18 21:14:07,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611727817] [2020-08-18 21:14:07,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 21:14:07,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447543008] [2020-08-18 21:14:07,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:14:07,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:14:07,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:07,397 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 21:14:07,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,417 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 21:14:07,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:14:07,418 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 21:14:07,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,419 INFO L225 Difference]: With dead ends: 18 [2020-08-18 21:14:07,419 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 21:14:07,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:07,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 21:14:07,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 21:14:07,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 21:14:07,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 21:14:07,428 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 21:14:07,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,429 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 21:14:07,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:14:07,429 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 21:14:07,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 21:14:07,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,430 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:14:07,431 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 21:14:07,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550202233] [2020-08-18 21:14:07,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550202233] [2020-08-18 21:14:07,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:14:07,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426064760] [2020-08-18 21:14:07,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:14:07,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:14:07,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:07,568 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 21:14:07,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,593 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 21:14:07,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:14:07,594 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 21:14:07,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,595 INFO L225 Difference]: With dead ends: 19 [2020-08-18 21:14:07,595 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 21:14:07,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:07,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 21:14:07,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 21:14:07,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 21:14:07,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 21:14:07,602 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 21:14:07,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,603 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 21:14:07,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:14:07,603 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 21:14:07,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:14:07,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,604 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:14:07,605 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 21:14:07,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252794479] [2020-08-18 21:14:07,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,734 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252794479] [2020-08-18 21:14:07,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:14:07,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792115591] [2020-08-18 21:14:07,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:14:07,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:14:07,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:07,737 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 21:14:07,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,765 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 21:14:07,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:14:07,766 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 21:14:07,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,767 INFO L225 Difference]: With dead ends: 20 [2020-08-18 21:14:07,767 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 21:14:07,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:07,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 21:14:07,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 21:14:07,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 21:14:07,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 21:14:07,773 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 21:14:07,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,774 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 21:14:07,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:14:07,774 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 21:14:07,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 21:14:07,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,775 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:14:07,779 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 21:14:07,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302076024] [2020-08-18 21:14:07,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,925 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302076024] [2020-08-18 21:14:07,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:14:07,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147680439] [2020-08-18 21:14:07,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:07,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:07,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:07,934 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 21:14:07,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,993 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 21:14:07,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:07,996 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 21:14:07,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,997 INFO L225 Difference]: With dead ends: 21 [2020-08-18 21:14:07,998 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 21:14:07,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:07,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 21:14:08,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 21:14:08,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 21:14:08,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 21:14:08,009 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 21:14:08,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,010 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 21:14:08,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:08,010 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 21:14:08,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 21:14:08,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,012 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:14:08,013 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 21:14:08,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453449983] [2020-08-18 21:14:08,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453449983] [2020-08-18 21:14:08,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:14:08,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138338844] [2020-08-18 21:14:08,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:14:08,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:14:08,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:08,227 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 21:14:08,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,273 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 21:14:08,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:14:08,273 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 21:14:08,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,274 INFO L225 Difference]: With dead ends: 22 [2020-08-18 21:14:08,274 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 21:14:08,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:08,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 21:14:08,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 21:14:08,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 21:14:08,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 21:14:08,280 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 21:14:08,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,281 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 21:14:08,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:14:08,281 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 21:14:08,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:14:08,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,282 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:14:08,283 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 21:14:08,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1062478436] [2020-08-18 21:14:08,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,414 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1062478436] [2020-08-18 21:14:08,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:14:08,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465542754] [2020-08-18 21:14:08,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:14:08,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:14:08,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:08,417 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 21:14:08,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,486 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 21:14:08,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:14:08,487 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 21:14:08,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,488 INFO L225 Difference]: With dead ends: 23 [2020-08-18 21:14:08,488 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 21:14:08,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:08,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 21:14:08,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 21:14:08,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 21:14:08,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 21:14:08,494 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 21:14:08,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,495 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 21:14:08,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:14:08,495 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 21:14:08,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 21:14:08,496 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,496 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:14:08,496 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,497 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 21:14:08,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284640842] [2020-08-18 21:14:08,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,631 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284640842] [2020-08-18 21:14:08,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:14:08,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164979343] [2020-08-18 21:14:08,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:14:08,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:14:08,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:08,634 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 21:14:08,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,686 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 21:14:08,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:14:08,686 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 21:14:08,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,687 INFO L225 Difference]: With dead ends: 24 [2020-08-18 21:14:08,687 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 21:14:08,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:08,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 21:14:08,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 21:14:08,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 21:14:08,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 21:14:08,694 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 21:14:08,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,694 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 21:14:08,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:14:08,694 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 21:14:08,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:14:08,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,695 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:14:08,696 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,696 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 21:14:08,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731891228] [2020-08-18 21:14:08,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,854 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731891228] [2020-08-18 21:14:08,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:14:08,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498285648] [2020-08-18 21:14:08,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:14:08,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:14:08,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:08,857 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 21:14:08,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,926 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 21:14:08,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:14:08,927 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 21:14:08,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,928 INFO L225 Difference]: With dead ends: 25 [2020-08-18 21:14:08,928 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 21:14:08,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:08,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 21:14:08,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 21:14:08,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 21:14:08,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 21:14:08,934 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 21:14:08,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,935 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 21:14:08,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:14:08,935 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 21:14:08,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 21:14:08,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,936 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:14:08,936 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,937 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 21:14:08,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738181320] [2020-08-18 21:14:08,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,103 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738181320] [2020-08-18 21:14:09,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:14:09,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443483946] [2020-08-18 21:14:09,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:14:09,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:14:09,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:09,106 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 21:14:09,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,198 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 21:14:09,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:14:09,199 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 21:14:09,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,200 INFO L225 Difference]: With dead ends: 26 [2020-08-18 21:14:09,200 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 21:14:09,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:09,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 21:14:09,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 21:14:09,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:14:09,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 21:14:09,206 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 21:14:09,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,207 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 21:14:09,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:14:09,207 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 21:14:09,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:14:09,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,208 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:14:09,209 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 21:14:09,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945942672] [2020-08-18 21:14:09,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,435 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945942672] [2020-08-18 21:14:09,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:14:09,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423463501] [2020-08-18 21:14:09,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:14:09,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:14:09,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:09,439 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 21:14:09,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,538 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 21:14:09,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:14:09,540 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 21:14:09,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,544 INFO L225 Difference]: With dead ends: 27 [2020-08-18 21:14:09,544 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 21:14:09,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:09,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 21:14:09,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 21:14:09,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 21:14:09,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 21:14:09,554 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 21:14:09,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,554 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 21:14:09,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:14:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 21:14:09,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 21:14:09,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,556 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:14:09,556 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 21:14:09,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322937712] [2020-08-18 21:14:09,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,791 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322937712] [2020-08-18 21:14:09,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 21:14:09,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408890351] [2020-08-18 21:14:09,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 21:14:09,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 21:14:09,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:09,796 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 21:14:09,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,903 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 21:14:09,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 21:14:09,904 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 21:14:09,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,905 INFO L225 Difference]: With dead ends: 28 [2020-08-18 21:14:09,905 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 21:14:09,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:09,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 21:14:09,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 21:14:09,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:14:09,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 21:14:09,916 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 21:14:09,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,916 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 21:14:09,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 21:14:09,917 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 21:14:09,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:14:09,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,917 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:14:09,919 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,919 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 21:14:09,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532157239] [2020-08-18 21:14:09,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,183 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:10,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532157239] [2020-08-18 21:14:10,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:14:10,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097492480] [2020-08-18 21:14:10,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:14:10,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:14:10,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:10,186 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 21:14:10,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,315 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 21:14:10,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:14:10,316 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 21:14:10,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,317 INFO L225 Difference]: With dead ends: 29 [2020-08-18 21:14:10,317 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 21:14:10,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:10,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 21:14:10,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 21:14:10,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 21:14:10,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 21:14:10,323 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 21:14:10,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,323 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 21:14:10,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:14:10,323 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 21:14:10,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 21:14:10,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,325 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:14:10,325 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,326 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 21:14:10,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643580664] [2020-08-18 21:14:10,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,623 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:10,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643580664] [2020-08-18 21:14:10,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:14:10,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970137418] [2020-08-18 21:14:10,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:14:10,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:14:10,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:14:10,629 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 21:14:10,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,813 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 21:14:10,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:14:10,818 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 21:14:10,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,819 INFO L225 Difference]: With dead ends: 30 [2020-08-18 21:14:10,819 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 21:14:10,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:14:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 21:14:10,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 21:14:10,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 21:14:10,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 21:14:10,827 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 21:14:10,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,827 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 21:14:10,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:14:10,827 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 21:14:10,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 21:14:10,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,828 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:14:10,829 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 21:14:10,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807316821] [2020-08-18 21:14:10,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:11,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,070 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:11,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807316821] [2020-08-18 21:14:11,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:11,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:14:11,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87090253] [2020-08-18 21:14:11,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:14:11,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:11,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:14:11,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:14:11,072 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 21:14:11,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:11,236 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 21:14:11,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:14:11,237 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 21:14:11,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:11,237 INFO L225 Difference]: With dead ends: 31 [2020-08-18 21:14:11,238 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 21:14:11,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:14:11,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 21:14:11,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 21:14:11,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 21:14:11,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 21:14:11,247 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 21:14:11,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:11,247 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 21:14:11,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:14:11,248 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 21:14:11,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 21:14:11,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:11,250 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:11,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:14:11,250 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:11,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:11,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 21:14:11,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:11,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319750382] [2020-08-18 21:14:11,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:11,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:11,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:11,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319750382] [2020-08-18 21:14:11,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:11,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 21:14:11,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280789324] [2020-08-18 21:14:11,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 21:14:11,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:11,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 21:14:11,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:14:11,526 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 21:14:11,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:11,708 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 21:14:11,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 21:14:11,709 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 21:14:11,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:11,710 INFO L225 Difference]: With dead ends: 32 [2020-08-18 21:14:11,710 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 21:14:11,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:14:11,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 21:14:11,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 21:14:11,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 21:14:11,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 21:14:11,715 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 21:14:11,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:11,716 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 21:14:11,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 21:14:11,716 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 21:14:11,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:14:11,717 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:11,717 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:11,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:14:11,717 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:11,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:11,718 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 21:14:11,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:11,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401915484] [2020-08-18 21:14:11,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:11,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:12,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,008 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:12,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401915484] [2020-08-18 21:14:12,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:12,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:14:12,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725220609] [2020-08-18 21:14:12,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:14:12,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:12,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:14:12,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:14:12,011 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 21:14:12,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:12,217 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 21:14:12,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:14:12,218 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 21:14:12,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:12,219 INFO L225 Difference]: With dead ends: 33 [2020-08-18 21:14:12,219 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 21:14:12,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:14:12,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 21:14:12,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 21:14:12,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 21:14:12,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 21:14:12,225 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 21:14:12,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:12,225 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 21:14:12,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:14:12,225 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 21:14:12,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 21:14:12,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:12,226 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:12,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 21:14:12,227 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:12,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:12,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 21:14:12,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:12,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327847734] [2020-08-18 21:14:12,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:12,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,566 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:12,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327847734] [2020-08-18 21:14:12,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:12,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 21:14:12,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655314672] [2020-08-18 21:14:12,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 21:14:12,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:12,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 21:14:12,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:14:12,569 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 21:14:12,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:12,753 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 21:14:12,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 21:14:12,753 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 21:14:12,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:12,754 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:14:12,754 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 21:14:12,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:14:12,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 21:14:12,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 21:14:12,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:14:12,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 21:14:12,763 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 21:14:12,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:12,764 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 21:14:12,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 21:14:12,764 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 21:14:12,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:14:12,765 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:12,765 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:12,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 21:14:12,765 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:12,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:12,766 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 21:14:12,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:12,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836415963] [2020-08-18 21:14:12,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:12,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:13,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,136 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:13,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836415963] [2020-08-18 21:14:13,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:13,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:14:13,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297643016] [2020-08-18 21:14:13,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:14:13,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:13,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:14:13,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:14:13,141 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 21:14:13,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:13,422 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 21:14:13,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:14:13,423 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 21:14:13,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:13,423 INFO L225 Difference]: With dead ends: 35 [2020-08-18 21:14:13,423 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:14:13,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:14:13,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:14:13,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 21:14:13,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 21:14:13,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 21:14:13,435 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 21:14:13,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:13,436 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 21:14:13,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:14:13,436 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 21:14:13,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 21:14:13,436 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:13,437 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:13,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 21:14:13,437 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:13,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:13,437 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 21:14:13,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:13,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153994494] [2020-08-18 21:14:13,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:13,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:13,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,817 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:13,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153994494] [2020-08-18 21:14:13,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:13,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 21:14:13,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072672671] [2020-08-18 21:14:13,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 21:14:13,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:13,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 21:14:13,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:14:13,819 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 21:14:14,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:14,035 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 21:14:14,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 21:14:14,035 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 21:14:14,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:14,036 INFO L225 Difference]: With dead ends: 36 [2020-08-18 21:14:14,036 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 21:14:14,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:14:14,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 21:14:14,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 21:14:14,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 21:14:14,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 21:14:14,042 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 21:14:14,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:14,043 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 21:14:14,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 21:14:14,043 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 21:14:14,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:14:14,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:14,044 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:14,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 21:14:14,044 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:14,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:14,045 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 21:14:14,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:14,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103310198] [2020-08-18 21:14:14,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:14,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:14,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:14,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:14,444 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:14,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103310198] [2020-08-18 21:14:14,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:14,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:14:14,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795063957] [2020-08-18 21:14:14,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:14:14,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:14,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:14:14,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:14:14,448 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 21:14:14,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:14,711 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 21:14:14,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:14:14,712 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 21:14:14,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:14,713 INFO L225 Difference]: With dead ends: 37 [2020-08-18 21:14:14,713 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:14:14,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:14:14,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:14:14,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 21:14:14,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 21:14:14,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 21:14:14,718 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 21:14:14,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:14,720 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 21:14:14,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:14:14,720 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 21:14:14,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 21:14:14,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:14,722 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:14,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 21:14:14,722 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:14,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:14,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 21:14:14,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:14,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938442823] [2020-08-18 21:14:14,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:14,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:15,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,177 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:15,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938442823] [2020-08-18 21:14:15,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:15,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 21:14:15,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201493132] [2020-08-18 21:14:15,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 21:14:15,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:15,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 21:14:15,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:14:15,180 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 21:14:15,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:15,471 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 21:14:15,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 21:14:15,473 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 21:14:15,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:15,474 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:14:15,474 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 21:14:15,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:14:15,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 21:14:15,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 21:14:15,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:14:15,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 21:14:15,486 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 21:14:15,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:15,486 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 21:14:15,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 21:14:15,486 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 21:14:15,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:14:15,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:15,488 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:15,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 21:14:15,488 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:15,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:15,489 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 21:14:15,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:15,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283922264] [2020-08-18 21:14:15,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:15,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:15,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,958 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:15,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283922264] [2020-08-18 21:14:15,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:15,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:14:15,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657368601] [2020-08-18 21:14:15,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:14:15,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:15,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:14:15,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:14:15,961 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 21:14:16,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:16,321 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 21:14:16,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:14:16,321 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 21:14:16,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:16,322 INFO L225 Difference]: With dead ends: 39 [2020-08-18 21:14:16,322 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 21:14:16,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:14:16,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 21:14:16,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 21:14:16,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 21:14:16,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 21:14:16,327 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 21:14:16,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:16,328 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 21:14:16,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:14:16,328 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 21:14:16,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 21:14:16,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:16,329 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:16,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 21:14:16,329 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:16,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:16,330 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 21:14:16,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:16,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355962705] [2020-08-18 21:14:16,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:16,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:16,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:16,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:16,840 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:16,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355962705] [2020-08-18 21:14:16,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:16,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 21:14:16,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750124732] [2020-08-18 21:14:16,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 21:14:16,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:16,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 21:14:16,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:14:16,843 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 21:14:17,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:17,192 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 21:14:17,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 21:14:17,193 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 21:14:17,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:17,193 INFO L225 Difference]: With dead ends: 40 [2020-08-18 21:14:17,194 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 21:14:17,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:14:17,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 21:14:17,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 21:14:17,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:14:17,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 21:14:17,203 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 21:14:17,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:17,203 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 21:14:17,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 21:14:17,204 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 21:14:17,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:14:17,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:17,204 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:17,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 21:14:17,208 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:17,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:17,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 21:14:17,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:17,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968168267] [2020-08-18 21:14:17,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:17,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:17,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:17,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:17,762 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:17,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968168267] [2020-08-18 21:14:17,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:17,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:14:17,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610115728] [2020-08-18 21:14:17,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:14:17,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:17,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:14:17,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:14:17,766 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 21:14:18,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:18,147 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 21:14:18,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 21:14:18,151 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 21:14:18,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:18,152 INFO L225 Difference]: With dead ends: 41 [2020-08-18 21:14:18,152 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:14:18,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:14:18,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:14:18,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 21:14:18,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 21:14:18,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 21:14:18,156 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 21:14:18,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:18,156 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 21:14:18,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 21:14:18,156 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 21:14:18,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 21:14:18,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:18,156 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:18,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 21:14:18,157 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:18,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:18,157 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 21:14:18,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:18,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723167120] [2020-08-18 21:14:18,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:18,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:18,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:18,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:18,709 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:18,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723167120] [2020-08-18 21:14:18,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:18,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 21:14:18,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009758202] [2020-08-18 21:14:18,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 21:14:18,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:18,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 21:14:18,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:14:18,711 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 21:14:19,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:19,177 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 21:14:19,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 21:14:19,178 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 21:14:19,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:19,179 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:14:19,179 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 21:14:19,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:14:19,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 21:14:19,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 21:14:19,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:14:19,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 21:14:19,184 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 21:14:19,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:19,185 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 21:14:19,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 21:14:19,185 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 21:14:19,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:14:19,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:19,186 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:19,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 21:14:19,186 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:19,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:19,186 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 21:14:19,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:19,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859784646] [2020-08-18 21:14:19,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:19,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:19,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:19,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:19,856 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:19,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859784646] [2020-08-18 21:14:19,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:19,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 21:14:19,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118394199] [2020-08-18 21:14:19,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 21:14:19,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:19,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 21:14:19,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:14:19,859 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 21:14:20,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:20,252 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 21:14:20,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 21:14:20,252 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 21:14:20,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:20,253 INFO L225 Difference]: With dead ends: 43 [2020-08-18 21:14:20,253 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:14:20,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:14:20,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:14:20,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 21:14:20,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 21:14:20,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 21:14:20,266 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 21:14:20,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:20,266 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 21:14:20,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 21:14:20,266 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 21:14:20,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 21:14:20,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:20,270 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:20,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 21:14:20,270 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:20,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:20,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 21:14:20,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:20,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313749187] [2020-08-18 21:14:20,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:20,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:20,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:20,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:20,946 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:20,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313749187] [2020-08-18 21:14:20,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:20,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 21:14:20,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132752535] [2020-08-18 21:14:20,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 21:14:20,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:20,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 21:14:20,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:14:20,948 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 21:14:21,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:21,453 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 21:14:21,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 21:14:21,453 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 21:14:21,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:21,454 INFO L225 Difference]: With dead ends: 44 [2020-08-18 21:14:21,454 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 21:14:21,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:14:21,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 21:14:21,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 21:14:21,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:14:21,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 21:14:21,459 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 21:14:21,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:21,459 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 21:14:21,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 21:14:21,460 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 21:14:21,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:14:21,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:21,460 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:21,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 21:14:21,461 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:21,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:21,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 21:14:21,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:21,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272148492] [2020-08-18 21:14:21,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:21,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:22,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:22,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:22,153 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:22,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272148492] [2020-08-18 21:14:22,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:22,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 21:14:22,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628701072] [2020-08-18 21:14:22,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 21:14:22,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:22,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 21:14:22,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:14:22,155 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 21:14:22,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:22,665 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 21:14:22,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 21:14:22,665 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 21:14:22,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:22,666 INFO L225 Difference]: With dead ends: 45 [2020-08-18 21:14:22,666 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 21:14:22,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:14:22,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 21:14:22,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 21:14:22,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 21:14:22,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 21:14:22,672 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 21:14:22,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:22,672 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 21:14:22,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 21:14:22,672 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 21:14:22,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 21:14:22,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:22,673 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:22,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 21:14:22,673 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:22,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:22,674 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 21:14:22,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:22,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214068969] [2020-08-18 21:14:22,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:22,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:23,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,390 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:23,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214068969] [2020-08-18 21:14:23,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:23,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 21:14:23,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724516569] [2020-08-18 21:14:23,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 21:14:23,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:23,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 21:14:23,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:14:23,392 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 21:14:23,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:23,965 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 21:14:23,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 21:14:23,965 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 21:14:23,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:23,966 INFO L225 Difference]: With dead ends: 46 [2020-08-18 21:14:23,966 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 21:14:23,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:14:23,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 21:14:23,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 21:14:23,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:14:23,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 21:14:23,971 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 21:14:23,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:23,971 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 21:14:23,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 21:14:23,971 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 21:14:23,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:14:23,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:23,972 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:23,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 21:14:23,972 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:23,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:23,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 21:14:23,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:23,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818308952] [2020-08-18 21:14:23,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:23,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:24,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:24,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:24,708 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:24,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818308952] [2020-08-18 21:14:24,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:24,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 21:14:24,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999669661] [2020-08-18 21:14:24,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 21:14:24,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:24,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 21:14:24,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:14:24,710 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 21:14:25,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:25,306 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 21:14:25,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 21:14:25,306 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 21:14:25,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:25,307 INFO L225 Difference]: With dead ends: 47 [2020-08-18 21:14:25,308 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 21:14:25,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:14:25,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 21:14:25,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 21:14:25,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 21:14:25,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 21:14:25,312 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 21:14:25,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:25,313 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 21:14:25,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 21:14:25,313 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 21:14:25,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 21:14:25,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:25,314 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:25,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 21:14:25,314 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:25,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:25,314 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 21:14:25,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:25,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274498486] [2020-08-18 21:14:25,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:25,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:26,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:26,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:26,131 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:26,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274498486] [2020-08-18 21:14:26,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:26,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 21:14:26,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079479863] [2020-08-18 21:14:26,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 21:14:26,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:26,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 21:14:26,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:14:26,133 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 21:14:26,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:26,790 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 21:14:26,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 21:14:26,792 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 21:14:26,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:26,792 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:14:26,792 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 21:14:26,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:14:26,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 21:14:26,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 21:14:26,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 21:14:26,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 21:14:26,797 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 21:14:26,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:26,797 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 21:14:26,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 21:14:26,798 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 21:14:26,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 21:14:26,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:26,798 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:26,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 21:14:26,799 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:26,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:26,799 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 21:14:26,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:26,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27117063] [2020-08-18 21:14:26,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:26,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:27,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:27,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:27,627 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:27,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27117063] [2020-08-18 21:14:27,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:27,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 21:14:27,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053422063] [2020-08-18 21:14:27,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 21:14:27,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:27,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 21:14:27,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:14:27,629 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 21:14:28,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:28,310 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 21:14:28,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 21:14:28,311 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 21:14:28,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:28,312 INFO L225 Difference]: With dead ends: 49 [2020-08-18 21:14:28,312 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 21:14:28,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:14:28,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 21:14:28,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 21:14:28,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 21:14:28,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 21:14:28,317 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 21:14:28,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:28,317 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 21:14:28,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 21:14:28,318 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 21:14:28,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 21:14:28,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:28,318 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:28,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 21:14:28,319 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:28,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:28,319 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 21:14:28,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:28,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847588091] [2020-08-18 21:14:28,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:28,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:29,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:29,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:29,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847588091] [2020-08-18 21:14:29,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:29,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 21:14:29,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718026335] [2020-08-18 21:14:29,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 21:14:29,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:29,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 21:14:29,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:14:29,218 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 21:14:29,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:29,919 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 21:14:29,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 21:14:29,919 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 21:14:29,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:29,920 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:14:29,920 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 21:14:29,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:14:29,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 21:14:29,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 21:14:29,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 21:14:29,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 21:14:29,925 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 21:14:29,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:29,926 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 21:14:29,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 21:14:29,926 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 21:14:29,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 21:14:29,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:29,927 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:29,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 21:14:29,927 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:29,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:29,927 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 21:14:29,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:29,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659354160] [2020-08-18 21:14:29,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:29,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:30,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:30,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:30,833 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:30,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659354160] [2020-08-18 21:14:30,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:30,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 21:14:30,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535894547] [2020-08-18 21:14:30,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 21:14:30,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:30,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 21:14:30,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:14:30,836 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 21:14:31,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:31,632 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 21:14:31,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 21:14:31,633 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 21:14:31,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:31,634 INFO L225 Difference]: With dead ends: 51 [2020-08-18 21:14:31,634 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 21:14:31,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:14:31,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 21:14:31,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 21:14:31,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 21:14:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 21:14:31,641 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 21:14:31,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:31,644 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 21:14:31,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 21:14:31,644 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 21:14:31,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 21:14:31,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:31,645 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:31,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 21:14:31,645 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:31,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:31,645 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 21:14:31,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:31,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547815553] [2020-08-18 21:14:31,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:31,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:32,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:32,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:32,574 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:32,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547815553] [2020-08-18 21:14:32,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:32,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 21:14:32,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679679896] [2020-08-18 21:14:32,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 21:14:32,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:32,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 21:14:32,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:14:32,576 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 21:14:33,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:33,370 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 21:14:33,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 21:14:33,372 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 21:14:33,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:33,372 INFO L225 Difference]: With dead ends: 52 [2020-08-18 21:14:33,373 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 21:14:33,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:14:33,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 21:14:33,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 21:14:33,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 21:14:33,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 21:14:33,377 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 21:14:33,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:33,378 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 21:14:33,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 21:14:33,378 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 21:14:33,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 21:14:33,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:33,379 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:33,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 21:14:33,379 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:33,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:33,379 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 21:14:33,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:33,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049663615] [2020-08-18 21:14:33,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:33,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:34,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:34,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:34,371 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:34,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049663615] [2020-08-18 21:14:34,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:34,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 21:14:34,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120349272] [2020-08-18 21:14:34,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 21:14:34,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:34,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 21:14:34,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:14:34,373 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 21:14:35,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:35,237 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 21:14:35,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 21:14:35,239 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 21:14:35,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:35,239 INFO L225 Difference]: With dead ends: 53 [2020-08-18 21:14:35,240 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 21:14:35,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:14:35,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 21:14:35,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 21:14:35,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 21:14:35,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 21:14:35,244 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 21:14:35,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:35,244 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 21:14:35,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 21:14:35,244 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 21:14:35,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 21:14:35,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:35,245 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:35,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 21:14:35,245 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:35,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:35,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 21:14:35,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:35,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687539149] [2020-08-18 21:14:35,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:35,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:36,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:36,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:36,317 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:36,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687539149] [2020-08-18 21:14:36,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:36,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 21:14:36,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791304249] [2020-08-18 21:14:36,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 21:14:36,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:36,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 21:14:36,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:14:36,320 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 21:14:37,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:37,223 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 21:14:37,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 21:14:37,224 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 21:14:37,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:37,224 INFO L225 Difference]: With dead ends: 54 [2020-08-18 21:14:37,225 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 21:14:37,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:14:37,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 21:14:37,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 21:14:37,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 21:14:37,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 21:14:37,230 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 21:14:37,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:37,230 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 21:14:37,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 21:14:37,231 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 21:14:37,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 21:14:37,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:37,231 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:37,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 21:14:37,232 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:37,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:37,232 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 21:14:37,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:37,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651972748] [2020-08-18 21:14:37,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:37,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:38,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,343 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:38,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651972748] [2020-08-18 21:14:38,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:38,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 21:14:38,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733709315] [2020-08-18 21:14:38,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 21:14:38,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:38,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 21:14:38,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:14:38,345 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 21:14:39,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:39,350 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 21:14:39,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 21:14:39,351 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 21:14:39,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:39,352 INFO L225 Difference]: With dead ends: 55 [2020-08-18 21:14:39,352 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 21:14:39,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:14:39,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 21:14:39,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 21:14:39,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 21:14:39,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 21:14:39,357 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 21:14:39,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:39,357 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 21:14:39,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 21:14:39,358 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 21:14:39,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 21:14:39,358 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:39,358 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:39,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 21:14:39,359 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:39,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:39,359 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 21:14:39,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:39,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106080000] [2020-08-18 21:14:39,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:39,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:40,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,833 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:40,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106080000] [2020-08-18 21:14:40,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:40,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 21:14:40,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941518013] [2020-08-18 21:14:40,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 21:14:40,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:40,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 21:14:40,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:14:40,837 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 21:14:42,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:42,038 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 21:14:42,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 21:14:42,039 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 21:14:42,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:42,040 INFO L225 Difference]: With dead ends: 56 [2020-08-18 21:14:42,040 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 21:14:42,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:14:42,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 21:14:42,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 21:14:42,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 21:14:42,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 21:14:42,045 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 21:14:42,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:42,045 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 21:14:42,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 21:14:42,045 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 21:14:42,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 21:14:42,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:42,046 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:42,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 21:14:42,046 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:42,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:42,046 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 21:14:42,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:42,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716451498] [2020-08-18 21:14:42,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:42,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:43,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:43,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:43,259 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:43,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716451498] [2020-08-18 21:14:43,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:43,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 21:14:43,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631596551] [2020-08-18 21:14:43,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 21:14:43,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:43,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 21:14:43,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:14:43,261 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 21:14:44,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:44,335 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 21:14:44,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 21:14:44,336 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 21:14:44,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:44,336 INFO L225 Difference]: With dead ends: 57 [2020-08-18 21:14:44,336 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 21:14:44,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:14:44,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 21:14:44,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 21:14:44,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 21:14:44,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 21:14:44,341 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 21:14:44,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:44,342 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 21:14:44,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 21:14:44,342 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 21:14:44,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 21:14:44,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:44,343 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:44,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 21:14:44,343 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:44,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:44,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 21:14:44,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:44,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667384481] [2020-08-18 21:14:44,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:44,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:45,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:45,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:45,732 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:45,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667384481] [2020-08-18 21:14:45,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:45,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 21:14:45,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553023766] [2020-08-18 21:14:45,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 21:14:45,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:45,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 21:14:45,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:14:45,735 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 21:14:46,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:46,856 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 21:14:46,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 21:14:46,856 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 21:14:46,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:46,857 INFO L225 Difference]: With dead ends: 58 [2020-08-18 21:14:46,858 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 21:14:46,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:14:46,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 21:14:46,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 21:14:46,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 21:14:46,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 21:14:46,863 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 21:14:46,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:46,863 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 21:14:46,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 21:14:46,864 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 21:14:46,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 21:14:46,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:46,864 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:46,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 21:14:46,865 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:46,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:46,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 21:14:46,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:46,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653983342] [2020-08-18 21:14:46,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:46,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:48,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:48,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:48,272 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:48,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653983342] [2020-08-18 21:14:48,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:48,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 21:14:48,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784621718] [2020-08-18 21:14:48,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 21:14:48,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:48,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 21:14:48,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 21:14:48,274 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 21:14:49,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:49,422 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 21:14:49,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 21:14:49,426 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 21:14:49,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:49,427 INFO L225 Difference]: With dead ends: 59 [2020-08-18 21:14:49,427 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 21:14:49,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 21:14:49,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 21:14:49,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 21:14:49,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 21:14:49,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 21:14:49,433 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 21:14:49,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:49,433 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 21:14:49,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 21:14:49,434 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 21:14:49,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 21:14:49,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:49,434 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:49,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 21:14:49,440 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:49,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:49,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 21:14:49,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:49,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738959020] [2020-08-18 21:14:49,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:49,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:50,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:50,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:50,920 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:50,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738959020] [2020-08-18 21:14:50,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:50,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 21:14:50,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523434806] [2020-08-18 21:14:50,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 21:14:50,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:50,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 21:14:50,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 21:14:50,923 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 21:14:52,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:52,117 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 21:14:52,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 21:14:52,117 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 21:14:52,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:52,118 INFO L225 Difference]: With dead ends: 60 [2020-08-18 21:14:52,118 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 21:14:52,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 21:14:52,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 21:14:52,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 21:14:52,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 21:14:52,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 21:14:52,122 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 21:14:52,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:52,122 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 21:14:52,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 21:14:52,122 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 21:14:52,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 21:14:52,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:52,123 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:52,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 21:14:52,123 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:52,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:52,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 21:14:52,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:52,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591734924] [2020-08-18 21:14:52,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:52,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:53,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:53,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:53,563 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:53,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591734924] [2020-08-18 21:14:53,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:53,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 21:14:53,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12234806] [2020-08-18 21:14:53,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 21:14:53,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:53,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 21:14:53,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 21:14:53,565 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 21:14:54,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:54,915 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 21:14:54,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 21:14:54,915 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 21:14:54,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:54,916 INFO L225 Difference]: With dead ends: 61 [2020-08-18 21:14:54,916 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 21:14:54,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 21:14:54,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 21:14:54,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 21:14:54,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 21:14:54,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 21:14:54,921 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 21:14:54,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:54,921 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 21:14:54,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 21:14:54,921 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 21:14:54,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 21:14:54,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:54,922 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:54,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 21:14:54,922 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:54,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:54,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 21:14:54,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:54,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298759703] [2020-08-18 21:14:54,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:54,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:56,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:56,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:56,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:56,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298759703] [2020-08-18 21:14:56,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:56,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 21:14:56,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683756096] [2020-08-18 21:14:56,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 21:14:56,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:56,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 21:14:56,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 21:14:56,486 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 21:14:57,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:57,798 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 21:14:57,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 21:14:57,799 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 21:14:57,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:57,800 INFO L225 Difference]: With dead ends: 62 [2020-08-18 21:14:57,800 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 21:14:57,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 21:14:57,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 21:14:57,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 21:14:57,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 21:14:57,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 21:14:57,805 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 21:14:57,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:57,806 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 21:14:57,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 21:14:57,806 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 21:14:57,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 21:14:57,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:57,807 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:57,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 21:14:57,807 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:57,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:57,807 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 21:14:57,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:57,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [679286593] [2020-08-18 21:14:57,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:57,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:59,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:59,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:59,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:59,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [679286593] [2020-08-18 21:14:59,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:59,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 21:14:59,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946506712] [2020-08-18 21:14:59,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 21:14:59,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:59,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 21:14:59,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 21:14:59,392 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 21:15:00,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:00,755 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 21:15:00,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 21:15:00,756 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 21:15:00,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:00,757 INFO L225 Difference]: With dead ends: 63 [2020-08-18 21:15:00,757 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 21:15:00,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 21:15:00,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 21:15:00,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 21:15:00,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 21:15:00,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 21:15:00,763 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 21:15:00,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:00,763 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 21:15:00,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 21:15:00,763 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 21:15:00,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 21:15:00,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:00,764 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:00,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 21:15:00,764 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:00,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:00,764 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 21:15:00,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:00,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925056946] [2020-08-18 21:15:00,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:00,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:02,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:15:02,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:02,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:15:02,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925056946] [2020-08-18 21:15:02,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:15:02,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 21:15:02,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264983796] [2020-08-18 21:15:02,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 21:15:02,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:15:02,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 21:15:02,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 21:15:02,372 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 21:15:03,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:03,909 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 21:15:03,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 21:15:03,910 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 21:15:03,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:03,911 INFO L225 Difference]: With dead ends: 64 [2020-08-18 21:15:03,911 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 21:15:03,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 21:15:03,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 21:15:03,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 21:15:03,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 21:15:03,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 21:15:03,915 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 21:15:03,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:03,916 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 21:15:03,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 21:15:03,916 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 21:15:03,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 21:15:03,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:03,917 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:03,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 21:15:03,917 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:03,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:03,917 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 21:15:03,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:03,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411307691] [2020-08-18 21:15:03,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:03,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat