/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 -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 [2020-08-19 02:53:43,115 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:53:43,119 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:53:43,144 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:53:43,145 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:53:43,146 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:53:43,147 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:53:43,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:53:43,151 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:53:43,152 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:53:43,153 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:53:43,154 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:53:43,154 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:53:43,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:53:43,156 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:53:43,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:53:43,158 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:53:43,159 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:53:43,161 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:53:43,163 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:53:43,164 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:53:43,165 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:53:43,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:53:43,168 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:53:43,171 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:53:43,179 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:53:43,180 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:53:43,181 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:53:43,182 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 [2020-08-19 02:53:43,205 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:53:43,205 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:53:43,206 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:53:43,207 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:53:43,207 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:53:43,207 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:53:43,207 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:53:43,207 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:53:43,208 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:53:43,208 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:53:43,208 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:53:43,208 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:53:43,208 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:53:43,209 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:53:43,209 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:53:43,209 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:53:43,209 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:53:43,209 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:53:43,210 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:53:43,210 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:53:43,210 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:53:43,210 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:53:43,210 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:53:43,211 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:53:43,211 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:53:43,211 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:53:43,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:53:43,211 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:53:43,212 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:53:43,212 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; [2020-08-19 02:53:43,516 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:53:43,530 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:53:43,533 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:53:43,535 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:53:43,536 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:53:43,537 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 02:53:43,615 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f7c4f1a4a/3991cf2d2e9142889096e7dcf74cc14e/FLAG7111b0c4b [2020-08-19 02:53:44,060 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:53:44,061 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 02:53:44,069 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f7c4f1a4a/3991cf2d2e9142889096e7dcf74cc14e/FLAG7111b0c4b [2020-08-19 02:53:44,427 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f7c4f1a4a/3991cf2d2e9142889096e7dcf74cc14e [2020-08-19 02:53:44,438 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:53:44,440 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:53:44,441 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:53:44,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:53:44,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:53:44,446 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,449 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@182b6a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44, skipping insertion in model container [2020-08-19 02:53:44,449 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,457 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:53:44,473 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:53:44,672 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:53:44,676 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:53:44,689 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:53:44,700 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:53:44,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44 WrapperNode [2020-08-19 02:53:44,701 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:53:44,702 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:53:44,702 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:53:44,702 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:53:44,714 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,718 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,718 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,726 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,727 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (1/1) ... [2020-08-19 02:53:44,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:53:44,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:53:44,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:53:44,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:53:44,817 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (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 [2020-08-19 02:53:44,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:53:44,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:53:44,879 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:53:44,880 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:53:44,880 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:53:44,880 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:53:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:53:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:53:44,881 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:53:45,047 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:53:45,048 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:53:45,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:53:45 BoogieIcfgContainer [2020-08-19 02:53:45,051 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:53:45,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:53:45,053 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:53:45,056 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:53:45,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:53:44" (1/3) ... [2020-08-19 02:53:45,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d07fe6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:53:45, skipping insertion in model container [2020-08-19 02:53:45,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:44" (2/3) ... [2020-08-19 02:53:45,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d07fe6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:53:45, skipping insertion in model container [2020-08-19 02:53:45,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:53:45" (3/3) ... [2020-08-19 02:53:45,060 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-19 02:53:45,070 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:53:45,077 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:53:45,092 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:53:45,113 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:53:45,113 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:53:45,113 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:53:45,113 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:53:45,114 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:53:45,114 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:53:45,114 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:53:45,114 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:53:45,130 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 02:53:45,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:53:45,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:45,137 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:45,137 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:45,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:45,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 02:53:45,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:45,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521594173] [2020-08-19 02:53:45,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:45,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:45,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:45,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521594173] [2020-08-19 02:53:45,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:53:45,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:53:45,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914352070] [2020-08-19 02:53:45,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:53:45,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:45,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:53:45,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:53:45,381 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 02:53:45,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:45,451 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 02:53:45,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:53:45,454 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 02:53:45,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:45,465 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:53:45,465 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 02:53:45,469 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 [2020-08-19 02:53:45,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 02:53:45,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 02:53:45,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 02:53:45,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 02:53:45,515 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 02:53:45,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:45,515 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 02:53:45,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:53:45,516 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 02:53:45,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 02:53:45,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:45,516 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:45,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:53:45,517 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:45,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:45,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 02:53:45,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:45,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546318382] [2020-08-19 02:53:45,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:45,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:45,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:45,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546318382] [2020-08-19 02:53:45,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:45,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 02:53:45,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393758416] [2020-08-19 02:53:45,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:53:45,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:45,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:53:45,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:53:45,651 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 02:53:45,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:45,676 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 02:53:45,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:53:45,684 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 02:53:45,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:45,685 INFO L225 Difference]: With dead ends: 18 [2020-08-19 02:53:45,685 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 02:53:45,686 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 [2020-08-19 02:53:45,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 02:53:45,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 02:53:45,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 02:53:45,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 02:53:45,692 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 02:53:45,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:45,692 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 02:53:45,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:53:45,692 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 02:53:45,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:53:45,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:45,693 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:45,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:53:45,694 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:45,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:45,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 02:53:45,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:45,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671987613] [2020-08-19 02:53:45,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:45,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,814 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:45,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671987613] [2020-08-19 02:53:45,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:45,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:53:45,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733527937] [2020-08-19 02:53:45,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:53:45,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:45,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:53:45,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:53:45,819 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 02:53:45,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:45,843 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 02:53:45,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:53:45,844 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 02:53:45,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:45,845 INFO L225 Difference]: With dead ends: 19 [2020-08-19 02:53:45,845 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:53:45,846 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 [2020-08-19 02:53:45,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:53:45,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 02:53:45,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 02:53:45,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 02:53:45,852 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 02:53:45,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:45,852 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 02:53:45,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:53:45,852 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 02:53:45,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 02:53:45,853 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:45,853 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:45,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:53:45,854 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:45,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:45,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 02:53:45,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:45,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423389813] [2020-08-19 02:53:45,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:45,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:45,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423389813] [2020-08-19 02:53:45,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:45,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:53:45,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873083861] [2020-08-19 02:53:45,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:53:45,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:45,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:53:45,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:53:45,974 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 02:53:46,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:46,004 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 02:53:46,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:53:46,004 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 02:53:46,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:46,005 INFO L225 Difference]: With dead ends: 20 [2020-08-19 02:53:46,005 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:53:46,006 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 [2020-08-19 02:53:46,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:53:46,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:53:46,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:53:46,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 02:53:46,011 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 02:53:46,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:46,012 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 02:53:46,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:53:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 02:53:46,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:53:46,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:46,013 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:46,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:53:46,013 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:46,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:46,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 02:53:46,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:46,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763714944] [2020-08-19 02:53:46,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:46,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:46,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:46,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763714944] [2020-08-19 02:53:46,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:46,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:53:46,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974580745] [2020-08-19 02:53:46,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:53:46,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:46,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:53:46,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:53:46,150 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 02:53:46,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:46,192 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 02:53:46,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:53:46,193 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 02:53:46,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:46,194 INFO L225 Difference]: With dead ends: 21 [2020-08-19 02:53:46,194 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:53:46,195 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 [2020-08-19 02:53:46,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:53:46,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 02:53:46,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 02:53:46,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 02:53:46,203 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 02:53:46,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:46,204 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 02:53:46,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:53:46,204 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 02:53:46,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 02:53:46,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:46,205 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:46,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:53:46,205 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:46,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:46,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 02:53:46,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:46,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355302728] [2020-08-19 02:53:46,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:46,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:46,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,393 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:46,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355302728] [2020-08-19 02:53:46,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:46,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:53:46,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523869970] [2020-08-19 02:53:46,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:53:46,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:46,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:53:46,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:53:46,397 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 02:53:46,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:46,452 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 02:53:46,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:53:46,453 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 02:53:46,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:46,454 INFO L225 Difference]: With dead ends: 22 [2020-08-19 02:53:46,454 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:53:46,455 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 [2020-08-19 02:53:46,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:53:46,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:53:46,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:53:46,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:53:46,460 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 02:53:46,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:46,460 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:53:46,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:53:46,460 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:53:46,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:53:46,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:46,461 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:46,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:53:46,462 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:46,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:46,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 02:53:46,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:46,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802045551] [2020-08-19 02:53:46,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:46,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:46,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,588 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:46,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802045551] [2020-08-19 02:53:46,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:46,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:53:46,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957809848] [2020-08-19 02:53:46,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:53:46,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:46,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:53:46,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:53:46,591 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 02:53:46,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:46,647 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 02:53:46,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:53:46,648 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 02:53:46,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:46,649 INFO L225 Difference]: With dead ends: 23 [2020-08-19 02:53:46,649 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 02:53:46,651 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 [2020-08-19 02:53:46,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 02:53:46,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 02:53:46,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 02:53:46,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 02:53:46,659 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 02:53:46,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:46,659 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 02:53:46,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:53:46,660 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 02:53:46,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 02:53:46,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:46,660 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:46,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:53:46,661 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:46,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:46,661 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 02:53:46,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:46,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254579596] [2020-08-19 02:53:46,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:46,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:46,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:46,860 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:46,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254579596] [2020-08-19 02:53:46,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:46,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:53:46,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103612553] [2020-08-19 02:53:46,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:53:46,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:46,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:53:46,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:53:46,862 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 02:53:46,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:46,937 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 02:53:46,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:53:46,939 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 02:53:46,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:46,940 INFO L225 Difference]: With dead ends: 24 [2020-08-19 02:53:46,940 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 02:53:46,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:53:46,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 02:53:46,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 02:53:46,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 02:53:46,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 02:53:46,947 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 02:53:46,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:46,947 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 02:53:46,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:53:46,947 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 02:53:46,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:53:46,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:46,948 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:46,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:53:46,949 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:46,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:46,949 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 02:53:46,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:46,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343642117] [2020-08-19 02:53:46,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:46,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:47,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,086 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:47,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343642117] [2020-08-19 02:53:47,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:47,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:53:47,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530358803] [2020-08-19 02:53:47,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:53:47,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:47,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:53:47,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:53:47,089 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 02:53:47,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:47,180 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 02:53:47,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:53:47,181 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 02:53:47,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:47,182 INFO L225 Difference]: With dead ends: 25 [2020-08-19 02:53:47,182 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:53:47,182 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 [2020-08-19 02:53:47,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:53:47,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 02:53:47,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:53:47,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 02:53:47,188 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 02:53:47,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:47,188 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 02:53:47,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:53:47,189 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 02:53:47,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 02:53:47,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:47,190 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:47,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:53:47,190 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:47,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:47,190 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 02:53:47,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:47,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74270513] [2020-08-19 02:53:47,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:47,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:47,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,369 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:47,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74270513] [2020-08-19 02:53:47,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:47,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:53:47,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551076205] [2020-08-19 02:53:47,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:53:47,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:47,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:53:47,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:53:47,372 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 02:53:47,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:47,470 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 02:53:47,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:53:47,471 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 02:53:47,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:47,472 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:53:47,472 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 02:53:47,473 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 [2020-08-19 02:53:47,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 02:53:47,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 02:53:47,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:53:47,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 02:53:47,484 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 02:53:47,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:47,485 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 02:53:47,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:53:47,486 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 02:53:47,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:53:47,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:47,487 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:47,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:53:47,487 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:47,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:47,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 02:53:47,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:47,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1861946422] [2020-08-19 02:53:47,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:47,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:47,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:47,743 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:47,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1861946422] [2020-08-19 02:53:47,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:47,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:53:47,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348182416] [2020-08-19 02:53:47,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:53:47,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:47,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:53:47,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:53:47,747 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 02:53:47,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:47,853 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 02:53:47,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:53:47,854 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 02:53:47,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:47,857 INFO L225 Difference]: With dead ends: 27 [2020-08-19 02:53:47,857 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 02:53:47,858 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 [2020-08-19 02:53:47,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 02:53:47,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 02:53:47,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 02:53:47,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 02:53:47,864 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 02:53:47,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:47,865 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 02:53:47,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:53:47,867 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 02:53:47,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 02:53:47,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:47,868 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:47,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:53:47,868 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:47,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:47,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 02:53:47,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:47,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788797364] [2020-08-19 02:53:47,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:47,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:48,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,088 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:48,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788797364] [2020-08-19 02:53:48,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:48,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:53:48,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062036878] [2020-08-19 02:53:48,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:53:48,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:48,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:53:48,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:53:48,090 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 02:53:48,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:48,201 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 02:53:48,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:53:48,203 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 02:53:48,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:48,203 INFO L225 Difference]: With dead ends: 28 [2020-08-19 02:53:48,204 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 02:53:48,204 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 [2020-08-19 02:53:48,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 02:53:48,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 02:53:48,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:53:48,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 02:53:48,213 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 02:53:48,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:48,216 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 02:53:48,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:53:48,217 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 02:53:48,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:53:48,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:48,218 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:48,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:53:48,218 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:48,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:48,219 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 02:53:48,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:48,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653052976] [2020-08-19 02:53:48,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:48,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,443 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:48,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653052976] [2020-08-19 02:53:48,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:48,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:53:48,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010459582] [2020-08-19 02:53:48,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:53:48,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:48,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:53:48,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:53:48,448 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 02:53:48,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:48,568 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 02:53:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:53:48,569 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 02:53:48,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:48,569 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:53:48,570 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 02:53:48,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:53:48,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 02:53:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 02:53:48,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 02:53:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 02:53:48,575 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 02:53:48,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:48,576 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 02:53:48,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:53:48,576 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 02:53:48,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 02:53:48,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:48,577 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:48,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:53:48,577 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:48,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:48,577 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 02:53:48,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:48,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382516939] [2020-08-19 02:53:48,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:48,807 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:48,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382516939] [2020-08-19 02:53:48,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:48,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:53:48,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498999119] [2020-08-19 02:53:48,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:53:48,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:48,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:53:48,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:53:48,809 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 02:53:48,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:48,957 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 02:53:48,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:53:48,959 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 02:53:48,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:48,960 INFO L225 Difference]: With dead ends: 30 [2020-08-19 02:53:48,960 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 02:53:48,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:53:48,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 02:53:48,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 02:53:48,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:53:48,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 02:53:48,970 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 02:53:48,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:48,970 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 02:53:48,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:53:48,971 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 02:53:48,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:53:48,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:48,971 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:48,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:53:48,972 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:48,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:48,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 02:53:48,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:48,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002937342] [2020-08-19 02:53:48,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:48,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:49,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:49,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:49,225 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:49,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002937342] [2020-08-19 02:53:49,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:49,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:53:49,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503891407] [2020-08-19 02:53:49,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:53:49,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:49,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:53:49,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:53:49,228 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 02:53:49,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:49,393 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 02:53:49,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:53:49,394 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 02:53:49,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:49,394 INFO L225 Difference]: With dead ends: 31 [2020-08-19 02:53:49,395 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:53:49,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:53:49,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:53:49,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 02:53:49,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 02:53:49,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 02:53:49,400 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 02:53:49,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:49,400 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 02:53:49,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:53:49,400 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 02:53:49,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 02:53:49,401 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:49,401 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:49,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:53:49,401 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:49,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:49,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 02:53:49,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:49,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176773988] [2020-08-19 02:53:49,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:49,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:49,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:49,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:49,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176773988] [2020-08-19 02:53:49,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:49,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:53:49,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103370878] [2020-08-19 02:53:49,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:53:49,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:49,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:53:49,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:53:49,721 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 02:53:49,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:49,891 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 02:53:49,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:53:49,891 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 02:53:49,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:49,892 INFO L225 Difference]: With dead ends: 32 [2020-08-19 02:53:49,892 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 02:53:49,893 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 [2020-08-19 02:53:49,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 02:53:49,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 02:53:49,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 02:53:49,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 02:53:49,897 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 02:53:49,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:49,898 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 02:53:49,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:53:49,898 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 02:53:49,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:53:49,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:49,899 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:49,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:53:49,899 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:49,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:49,899 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 02:53:49,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:49,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747016359] [2020-08-19 02:53:49,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:49,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,196 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747016359] [2020-08-19 02:53:50,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:50,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:53:50,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768619619] [2020-08-19 02:53:50,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:53:50,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:53:50,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:53:50,199 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 02:53:50,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,413 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 02:53:50,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:53:50,415 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 02:53:50,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,415 INFO L225 Difference]: With dead ends: 33 [2020-08-19 02:53:50,415 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 02:53:50,416 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 [2020-08-19 02:53:50,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 02:53:50,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 02:53:50,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 02:53:50,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 02:53:50,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 02:53:50,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:50,422 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 02:53:50,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:53:50,422 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 02:53:50,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 02:53:50,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,423 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:53:50,424 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 02:53:50,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110070840] [2020-08-19 02:53:50,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,764 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110070840] [2020-08-19 02:53:50,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:50,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:53:50,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726132011] [2020-08-19 02:53:50,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:53:50,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:53:50,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:53:50,767 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 02:53:50,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,996 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 02:53:50,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:53:50,998 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 02:53:50,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,999 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:53:50,999 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:53:51,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:53:51,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:53:51,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 02:53:51,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:53:51,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 02:53:51,005 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 02:53:51,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,005 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 02:53:51,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:53:51,005 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 02:53:51,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:53:51,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,006 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:53:51,006 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,007 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 02:53:51,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128803479] [2020-08-19 02:53:51,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,363 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128803479] [2020-08-19 02:53:51,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:53:51,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759611136] [2020-08-19 02:53:51,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:53:51,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:53:51,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:53:51,365 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 02:53:51,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:51,594 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 02:53:51,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:53:51,595 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 02:53:51,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:51,596 INFO L225 Difference]: With dead ends: 35 [2020-08-19 02:53:51,596 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:53:51,597 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 [2020-08-19 02:53:51,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:53:51,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 02:53:51,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 02:53:51,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 02:53:51,602 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 02:53:51,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,602 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 02:53:51,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:53:51,603 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 02:53:51,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 02:53:51,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,604 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:53:51,604 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,604 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 02:53:51,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436094468] [2020-08-19 02:53:51,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,000 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:52,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436094468] [2020-08-19 02:53:52,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:52,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:53:52,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262693161] [2020-08-19 02:53:52,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:53:52,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:52,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:53:52,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:53:52,002 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 02:53:52,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:52,312 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 02:53:52,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:53:52,313 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 02:53:52,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:52,314 INFO L225 Difference]: With dead ends: 36 [2020-08-19 02:53:52,314 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:53:52,315 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 [2020-08-19 02:53:52,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:53:52,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 02:53:52,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:53:52,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 02:53:52,319 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 02:53:52,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:52,320 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 02:53:52,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:53:52,320 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 02:53:52,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:53:52,321 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:52,321 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:52,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:53:52,321 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:52,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:52,322 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 02:53:52,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:52,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623770901] [2020-08-19 02:53:52,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:52,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:52,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,701 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:52,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623770901] [2020-08-19 02:53:52,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:52,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:53:52,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885347220] [2020-08-19 02:53:52,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:53:52,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:52,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:53:52,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:53:52,706 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 02:53:52,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:53,000 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 02:53:53,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:53:53,001 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 02:53:53,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:53,001 INFO L225 Difference]: With dead ends: 37 [2020-08-19 02:53:53,001 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:53:53,002 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 [2020-08-19 02:53:53,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:53:53,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 02:53:53,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 02:53:53,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 02:53:53,007 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 02:53:53,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:53,007 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 02:53:53,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:53:53,008 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 02:53:53,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 02:53:53,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:53,011 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:53,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:53:53,011 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:53,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:53,012 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 02:53:53,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:53,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419385483] [2020-08-19 02:53:53,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:53,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:53,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,451 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:53,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419385483] [2020-08-19 02:53:53,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:53,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:53:53,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486214996] [2020-08-19 02:53:53,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:53:53,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:53,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:53:53,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:53:53,454 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 02:53:53,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:53,751 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 02:53:53,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:53:53,753 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 02:53:53,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:53,754 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:53:53,754 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 02:53:53,755 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 [2020-08-19 02:53:53,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 02:53:53,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 02:53:53,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:53:53,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 02:53:53,765 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 02:53:53,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:53,766 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 02:53:53,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:53:53,766 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 02:53:53,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:53:53,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:53,767 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:53,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:53:53,767 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:53,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:53,767 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 02:53:53,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:53,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124823950] [2020-08-19 02:53:53,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:53,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:54,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,210 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:54,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124823950] [2020-08-19 02:53:54,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:54,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:53:54,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067100254] [2020-08-19 02:53:54,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:53:54,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:54,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:53:54,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:53:54,212 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 02:53:54,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:54,558 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 02:53:54,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:53:54,559 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 02:53:54,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:54,560 INFO L225 Difference]: With dead ends: 39 [2020-08-19 02:53:54,560 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:53:54,561 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 [2020-08-19 02:53:54,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:53:54,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 02:53:54,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 02:53:54,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 02:53:54,567 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 02:53:54,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:54,567 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 02:53:54,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:53:54,567 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 02:53:54,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 02:53:54,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:54,568 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:54,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:53:54,568 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:54,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:54,569 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 02:53:54,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:54,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [974435042] [2020-08-19 02:53:54,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:54,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:55,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,076 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:55,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [974435042] [2020-08-19 02:53:55,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:55,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:53:55,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559334222] [2020-08-19 02:53:55,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:53:55,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:55,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:53:55,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:53:55,078 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 02:53:55,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:55,464 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 02:53:55,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:53:55,465 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 02:53:55,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:55,466 INFO L225 Difference]: With dead ends: 40 [2020-08-19 02:53:55,466 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 02:53:55,467 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 [2020-08-19 02:53:55,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 02:53:55,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 02:53:55,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:53:55,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 02:53:55,473 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 02:53:55,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:55,474 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 02:53:55,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:53:55,474 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 02:53:55,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:53:55,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:55,475 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:55,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:53:55,475 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:55,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:55,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 02:53:55,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:55,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368980685] [2020-08-19 02:53:55,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:55,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:56,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,023 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:56,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368980685] [2020-08-19 02:53:56,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:56,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:53:56,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933213608] [2020-08-19 02:53:56,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:53:56,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:56,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:53:56,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:53:56,025 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 02:53:56,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:56,399 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 02:53:56,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:53:56,400 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 02:53:56,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:56,400 INFO L225 Difference]: With dead ends: 41 [2020-08-19 02:53:56,400 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:53:56,401 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 [2020-08-19 02:53:56,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:53:56,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 02:53:56,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 02:53:56,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 02:53:56,405 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 02:53:56,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:56,406 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 02:53:56,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:53:56,406 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 02:53:56,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 02:53:56,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:56,406 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:56,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:53:56,407 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:56,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:56,407 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 02:53:56,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:56,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419636061] [2020-08-19 02:53:56,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:56,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:56,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,954 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:56,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419636061] [2020-08-19 02:53:56,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:56,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:53:56,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506756619] [2020-08-19 02:53:56,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:53:56,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:56,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:53:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:53:56,956 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 02:53:57,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:57,421 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 02:53:57,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:53:57,422 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 02:53:57,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:57,423 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:53:57,423 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 02:53:57,424 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 [2020-08-19 02:53:57,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 02:53:57,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 02:53:57,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:53:57,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 02:53:57,430 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 02:53:57,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:57,431 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 02:53:57,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:53:57,431 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 02:53:57,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:53:57,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:57,433 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:57,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:53:57,433 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:57,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:57,434 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 02:53:57,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:57,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36912818] [2020-08-19 02:53:57,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:57,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:58,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:58,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:58,112 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:58,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36912818] [2020-08-19 02:53:58,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:58,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:53:58,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065331767] [2020-08-19 02:53:58,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:53:58,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:58,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:53:58,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:53:58,114 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 02:53:58,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:58,574 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 02:53:58,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:53:58,575 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 02:53:58,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:58,575 INFO L225 Difference]: With dead ends: 43 [2020-08-19 02:53:58,576 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:53:58,577 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 [2020-08-19 02:53:58,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:53:58,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 02:53:58,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 02:53:58,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 02:53:58,584 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 02:53:58,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:58,584 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 02:53:58,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:53:58,584 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 02:53:58,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 02:53:58,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:58,585 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:58,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:53:58,586 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:58,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:58,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 02:53:58,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:58,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083958274] [2020-08-19 02:53:58,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:58,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:59,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:59,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:59,237 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:59,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083958274] [2020-08-19 02:53:59,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:59,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:53:59,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080297377] [2020-08-19 02:53:59,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:53:59,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:59,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:53:59,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:53:59,238 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 02:53:59,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:59,746 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 02:53:59,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:53:59,747 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 02:53:59,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:59,748 INFO L225 Difference]: With dead ends: 44 [2020-08-19 02:53:59,748 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 02:53:59,749 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 [2020-08-19 02:53:59,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 02:53:59,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 02:53:59,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:53:59,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 02:53:59,753 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 02:53:59,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:59,754 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 02:53:59,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:53:59,754 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 02:53:59,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:53:59,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:59,755 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:59,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:53:59,755 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:59,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:59,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 02:53:59,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:59,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960331626] [2020-08-19 02:53:59,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:59,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:00,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:00,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:00,452 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:00,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960331626] [2020-08-19 02:54:00,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:00,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:54:00,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586191589] [2020-08-19 02:54:00,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:54:00,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:00,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:54:00,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:54:00,455 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 02:54:01,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:01,005 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 02:54:01,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:54:01,006 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 02:54:01,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:01,007 INFO L225 Difference]: With dead ends: 45 [2020-08-19 02:54:01,007 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:54:01,008 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 [2020-08-19 02:54:01,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:54:01,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 02:54:01,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 02:54:01,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 02:54:01,013 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 02:54:01,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:01,013 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 02:54:01,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:54:01,013 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 02:54:01,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 02:54:01,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:01,014 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:01,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:54:01,014 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:01,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:01,014 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 02:54:01,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:01,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746927597] [2020-08-19 02:54:01,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:01,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:01,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:01,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:01,783 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:01,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746927597] [2020-08-19 02:54:01,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:01,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:54:01,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124099187] [2020-08-19 02:54:01,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:54:01,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:01,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:54:01,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:54:01,785 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 02:54:02,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:02,368 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 02:54:02,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:54:02,369 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 02:54:02,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:02,370 INFO L225 Difference]: With dead ends: 46 [2020-08-19 02:54:02,370 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:54:02,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:54:02,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:54:02,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 02:54:02,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:54:02,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 02:54:02,376 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 02:54:02,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:02,376 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 02:54:02,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:54:02,377 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 02:54:02,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:54:02,377 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:02,377 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:02,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:54:02,378 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:02,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:02,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 02:54:02,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:02,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743501160] [2020-08-19 02:54:02,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:02,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:03,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:03,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:03,173 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:03,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743501160] [2020-08-19 02:54:03,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:03,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:54:03,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001941589] [2020-08-19 02:54:03,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:54:03,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:03,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:54:03,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:54:03,175 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 02:54:03,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:03,812 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 02:54:03,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:54:03,813 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 02:54:03,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:03,814 INFO L225 Difference]: With dead ends: 47 [2020-08-19 02:54:03,814 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:54:03,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:54:03,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:54:03,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 02:54:03,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 02:54:03,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 02:54:03,819 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 02:54:03,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:03,820 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 02:54:03,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:54:03,820 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 02:54:03,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:54:03,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:03,821 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:03,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:54:03,821 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:03,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:03,822 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 02:54:03,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:03,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570857546] [2020-08-19 02:54:03,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:03,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:04,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:04,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:04,664 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:04,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570857546] [2020-08-19 02:54:04,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:04,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:54:04,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043265225] [2020-08-19 02:54:04,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:54:04,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:04,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:54:04,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:54:04,667 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 02:54:05,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:05,359 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 02:54:05,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:54:05,360 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 02:54:05,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:05,361 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:54:05,361 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 02:54:05,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:54:05,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 02:54:05,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 02:54:05,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:54:05,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 02:54:05,367 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 02:54:05,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:05,367 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 02:54:05,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:54:05,368 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 02:54:05,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 02:54:05,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:05,368 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:05,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:54:05,369 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:05,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:05,369 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 02:54:05,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:05,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179362835] [2020-08-19 02:54:05,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:05,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:06,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:06,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:06,245 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:06,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179362835] [2020-08-19 02:54:06,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:06,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:54:06,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441082815] [2020-08-19 02:54:06,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:54:06,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:06,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:54:06,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:54:06,247 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 02:54:06,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:06,962 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 02:54:06,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:54:06,963 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 02:54:06,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:06,964 INFO L225 Difference]: With dead ends: 49 [2020-08-19 02:54:06,964 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:54:06,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:54:06,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:54:06,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 02:54:06,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 02:54:06,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 02:54:06,968 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 02:54:06,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:06,968 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 02:54:06,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:54:06,968 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 02:54:06,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 02:54:06,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:06,969 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:06,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:54:06,969 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:06,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:06,970 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 02:54:06,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:06,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916083903] [2020-08-19 02:54:06,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:06,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:07,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:07,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:07,867 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:07,867 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916083903] [2020-08-19 02:54:07,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:07,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:54:07,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704776437] [2020-08-19 02:54:07,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:54:07,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:07,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:54:07,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:54:07,869 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 02:54:08,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:08,623 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 02:54:08,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:54:08,624 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 02:54:08,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:08,625 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:54:08,625 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 02:54:08,626 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 [2020-08-19 02:54:08,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 02:54:08,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 02:54:08,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:54:08,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 02:54:08,630 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 02:54:08,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:08,630 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 02:54:08,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:54:08,631 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 02:54:08,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:54:08,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:08,631 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:08,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:54:08,632 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:08,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:08,632 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 02:54:08,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:08,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521730293] [2020-08-19 02:54:08,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:09,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:09,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:09,605 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:09,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521730293] [2020-08-19 02:54:09,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:09,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:54:09,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463979017] [2020-08-19 02:54:09,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:54:09,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:09,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:54:09,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:54:09,608 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 02:54:10,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:10,422 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 02:54:10,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:54:10,422 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 02:54:10,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:10,423 INFO L225 Difference]: With dead ends: 51 [2020-08-19 02:54:10,423 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:54:10,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:54:10,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:54:10,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 02:54:10,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:54:10,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 02:54:10,428 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 02:54:10,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:10,428 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 02:54:10,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:54:10,428 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 02:54:10,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 02:54:10,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:10,429 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:10,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:54:10,429 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:10,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:10,430 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 02:54:10,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:10,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595140231] [2020-08-19 02:54:10,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:10,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:11,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:11,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:11,407 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:11,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595140231] [2020-08-19 02:54:11,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:11,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:54:11,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120529405] [2020-08-19 02:54:11,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:54:11,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:11,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:54:11,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:54:11,409 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 02:54:12,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:12,238 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 02:54:12,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:54:12,240 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 02:54:12,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:12,241 INFO L225 Difference]: With dead ends: 52 [2020-08-19 02:54:12,241 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 02:54:12,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:54:12,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 02:54:12,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 02:54:12,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 02:54:12,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 02:54:12,245 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 02:54:12,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:12,245 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 02:54:12,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:54:12,245 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 02:54:12,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:54:12,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:12,246 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:12,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:54:12,246 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:12,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:12,246 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 02:54:12,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:12,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447523721] [2020-08-19 02:54:12,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:12,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:13,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:13,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:13,296 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:13,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447523721] [2020-08-19 02:54:13,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:13,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:54:13,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562087593] [2020-08-19 02:54:13,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:54:13,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:13,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:54:13,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:54:13,298 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 02:54:14,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:14,188 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 02:54:14,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:54:14,190 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 02:54:14,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:14,191 INFO L225 Difference]: With dead ends: 53 [2020-08-19 02:54:14,191 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 02:54:14,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:54:14,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 02:54:14,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 02:54:14,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 02:54:14,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 02:54:14,198 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 02:54:14,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:14,198 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 02:54:14,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:54:14,199 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 02:54:14,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 02:54:14,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:14,199 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:14,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:54:14,200 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:14,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:14,200 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 02:54:14,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:14,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593139458] [2020-08-19 02:54:14,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:14,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,336 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593139458] [2020-08-19 02:54:15,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:15,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:54:15,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400346665] [2020-08-19 02:54:15,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:54:15,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:54:15,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:54:15,339 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 02:54:16,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,299 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 02:54:16,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:54:16,300 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 02:54:16,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,301 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:54:16,301 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:54:16,302 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 [2020-08-19 02:54:16,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:54:16,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 02:54:16,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:54:16,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 02:54:16,306 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 02:54:16,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,306 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 02:54:16,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:54:16,307 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 02:54:16,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:54:16,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,307 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:54:16,308 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,308 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 02:54:16,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462153661] [2020-08-19 02:54:16,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:17,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:17,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462153661] [2020-08-19 02:54:17,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:17,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:54:17,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503228086] [2020-08-19 02:54:17,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:54:17,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:17,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:54:17,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:54:17,438 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 02:54:18,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:18,456 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 02:54:18,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:54:18,457 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 02:54:18,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:18,458 INFO L225 Difference]: With dead ends: 55 [2020-08-19 02:54:18,458 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 02:54:18,459 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 [2020-08-19 02:54:18,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 02:54:18,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 02:54:18,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 02:54:18,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 02:54:18,464 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 02:54:18,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:18,464 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 02:54:18,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:54:18,464 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 02:54:18,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 02:54:18,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:18,465 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:18,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:54:18,465 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:18,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:18,465 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 02:54:18,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:18,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386397128] [2020-08-19 02:54:18,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:18,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:19,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,671 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:19,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386397128] [2020-08-19 02:54:19,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:19,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 02:54:19,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415066232] [2020-08-19 02:54:19,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 02:54:19,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:19,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 02:54:19,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:54:19,673 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 02:54:20,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:20,735 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 02:54:20,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:54:20,739 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 02:54:20,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:20,740 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:54:20,740 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 02:54:20,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:54:20,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 02:54:20,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 02:54:20,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 02:54:20,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 02:54:20,745 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 02:54:20,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:20,745 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 02:54:20,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 02:54:20,745 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 02:54:20,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 02:54:20,746 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:20,746 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:20,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:54:20,746 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:20,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:20,747 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 02:54:20,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:20,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442839965] [2020-08-19 02:54:20,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:20,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:22,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,038 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:22,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442839965] [2020-08-19 02:54:22,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:22,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 02:54:22,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940045524] [2020-08-19 02:54:22,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 02:54:22,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:22,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 02:54:22,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:54:22,041 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 02:54:23,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:23,137 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 02:54:23,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 02:54:23,139 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 02:54:23,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:23,140 INFO L225 Difference]: With dead ends: 57 [2020-08-19 02:54:23,140 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 02:54:23,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:54:23,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 02:54:23,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 02:54:23,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 02:54:23,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 02:54:23,144 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 02:54:23,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:23,145 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 02:54:23,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 02:54:23,145 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 02:54:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 02:54:23,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:23,146 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:23,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:54:23,146 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:23,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:23,146 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 02:54:23,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:23,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754798017] [2020-08-19 02:54:23,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:23,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:24,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,633 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:24,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754798017] [2020-08-19 02:54:24,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:24,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 02:54:24,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467803724] [2020-08-19 02:54:24,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 02:54:24,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:24,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 02:54:24,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:54:24,636 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 02:54:25,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:25,781 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 02:54:25,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 02:54:25,781 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 02:54:25,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:25,782 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:54:25,782 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 02:54:25,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:54:25,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 02:54:25,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 02:54:25,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 02:54:25,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 02:54:25,787 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 02:54:25,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:25,787 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 02:54:25,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 02:54:25,788 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 02:54:25,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 02:54:25,788 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:25,788 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:25,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 02:54:25,788 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:25,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:25,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 02:54:25,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:25,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076539867] [2020-08-19 02:54:25,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:25,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:27,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,108 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:27,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076539867] [2020-08-19 02:54:27,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:27,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 02:54:27,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595823101] [2020-08-19 02:54:27,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 02:54:27,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:27,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 02:54:27,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:54:27,111 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 02:54:28,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:28,346 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 02:54:28,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 02:54:28,349 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 02:54:28,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:28,350 INFO L225 Difference]: With dead ends: 59 [2020-08-19 02:54:28,350 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 02:54:28,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:54:28,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 02:54:28,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 02:54:28,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 02:54:28,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 02:54:28,356 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 02:54:28,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:28,357 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 02:54:28,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 02:54:28,357 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 02:54:28,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 02:54:28,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:28,358 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:28,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 02:54:28,358 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:28,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:28,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 02:54:28,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:28,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804440474] [2020-08-19 02:54:28,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:28,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:29,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:29,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:29,761 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:29,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804440474] [2020-08-19 02:54:29,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:29,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 02:54:29,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848809666] [2020-08-19 02:54:29,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 02:54:29,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:29,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 02:54:29,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:54:29,763 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 02:54:31,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:31,004 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 02:54:31,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 02:54:31,005 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 02:54:31,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:31,006 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:54:31,006 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 02:54:31,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:54:31,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 02:54:31,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 02:54:31,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 02:54:31,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 02:54:31,010 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 02:54:31,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:31,010 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 02:54:31,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 02:54:31,010 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 02:54:31,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 02:54:31,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:31,011 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:31,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 02:54:31,011 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:31,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:31,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 02:54:31,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:31,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215451590] [2020-08-19 02:54:31,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:31,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:32,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:32,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:32,505 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:32,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215451590] [2020-08-19 02:54:32,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:32,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 02:54:32,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688610844] [2020-08-19 02:54:32,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 02:54:32,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:32,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 02:54:32,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:54:32,506 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 02:54:33,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:33,795 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 02:54:33,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 02:54:33,796 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 02:54:33,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:33,797 INFO L225 Difference]: With dead ends: 61 [2020-08-19 02:54:33,797 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 02:54:33,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:54:33,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 02:54:33,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 02:54:33,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 02:54:33,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 02:54:33,802 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 02:54:33,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:33,802 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 02:54:33,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 02:54:33,802 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 02:54:33,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 02:54:33,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:33,803 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:33,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 02:54:33,803 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:33,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:33,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 02:54:33,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:33,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561294903] [2020-08-19 02:54:33,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:35,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:35,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:35,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:35,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561294903] [2020-08-19 02:54:35,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:35,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 02:54:35,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324650893] [2020-08-19 02:54:35,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 02:54:35,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:35,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 02:54:35,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 02:54:35,461 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 02:54:36,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:36,811 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 02:54:36,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 02:54:36,812 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 02:54:36,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:36,813 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:54:36,813 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 02:54:36,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 02:54:36,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 02:54:36,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 02:54:36,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 02:54:36,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 02:54:36,818 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 02:54:36,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:36,818 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 02:54:36,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 02:54:36,818 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 02:54:36,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 02:54:36,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:36,819 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:36,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 02:54:36,819 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:36,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:36,819 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 02:54:36,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:36,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838451084] [2020-08-19 02:54:36,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:36,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:38,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:38,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:38,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:38,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838451084] [2020-08-19 02:54:38,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:38,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 02:54:38,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100105353] [2020-08-19 02:54:38,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 02:54:38,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:38,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 02:54:38,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 02:54:38,453 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 02:54:39,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:39,839 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 02:54:39,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 02:54:39,840 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 02:54:39,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:39,841 INFO L225 Difference]: With dead ends: 63 [2020-08-19 02:54:39,841 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 02:54:39,842 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 [2020-08-19 02:54:39,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 02:54:39,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 02:54:39,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 02:54:39,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 02:54:39,847 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 02:54:39,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:39,847 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 02:54:39,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 02:54:39,847 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 02:54:39,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 02:54:39,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:39,848 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:39,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 02:54:39,848 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:39,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:39,848 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 02:54:39,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:39,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506181622] [2020-08-19 02:54:39,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:39,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:41,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:41,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:41,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:41,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506181622] [2020-08-19 02:54:41,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:41,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 02:54:41,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800998629] [2020-08-19 02:54:41,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 02:54:41,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:41,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 02:54:41,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 02:54:41,491 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-19 02:54:42,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:42,996 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 02:54:42,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 02:54:42,997 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-19 02:54:42,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:42,998 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:54:42,998 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 02:54:42,998 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 [2020-08-19 02:54:42,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 02:54:43,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-19 02:54:43,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 02:54:43,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 02:54:43,002 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-19 02:54:43,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:43,003 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 02:54:43,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 02:54:43,003 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 02:54:43,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 02:54:43,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:43,003 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:43,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 02:54:43,003 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:43,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:43,004 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-19 02:54:43,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:43,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096146266] [2020-08-19 02:54:43,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:43,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:44,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:44,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:44,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:44,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096146266] [2020-08-19 02:54:44,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:44,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-19 02:54:44,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262024738] [2020-08-19 02:54:44,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-19 02:54:44,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:44,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-19 02:54:44,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 02:54:44,730 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states.