/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:51:45,060 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:51:45,063 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:51:45,106 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:51:45,107 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:51:45,119 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:51:45,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:51:45,123 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:51:45,126 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:51:45,129 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:51:45,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:51:45,132 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:51:45,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:51:45,135 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:51:45,138 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:51:45,139 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:51:45,141 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:51:45,142 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:51:45,144 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:51:45,151 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:51:45,154 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:51:45,155 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:51:45,156 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:51:45,157 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:51:45,161 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:51:45,172 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:51:45,172 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:51:45,174 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:51:45,175 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:51:45,217 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:51:45,217 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:51:45,219 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:51:45,219 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:51:45,219 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:51:45,219 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:51:45,220 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:51:45,220 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:51:45,220 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:51:45,220 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:51:45,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:51:45,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:51:45,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:51:45,222 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:51:45,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:51:45,223 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:51:45,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:51:45,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:51:45,223 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:51:45,223 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:51:45,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:51:45,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:45,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:51:45,224 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:51:45,224 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:51:45,225 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:51:45,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:51:45,225 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:51:45,225 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:51:45,225 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:51:45,520 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:51:45,540 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:51:45,552 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:51:45,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:51:45,555 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:51:45,555 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 15:51:45,627 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/becb48583/c4794308aafc437b9c33b1c10b2507b3/FLAGb2c1874a4 [2020-08-21 15:51:46,113 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:51:46,114 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 15:51:46,118 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/becb48583/c4794308aafc437b9c33b1c10b2507b3/FLAGb2c1874a4 [2020-08-21 15:51:46,508 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/becb48583/c4794308aafc437b9c33b1c10b2507b3 [2020-08-21 15:51:46,518 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:51:46,520 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:51:46,521 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:46,521 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:51:46,528 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:51:46,529 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,533 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14083ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46, skipping insertion in model container [2020-08-21 15:51:46,533 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:51:46,559 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:51:46,747 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:46,752 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:51:46,766 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:46,781 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:51:46,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46 WrapperNode [2020-08-21 15:51:46,782 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:46,783 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:51:46,783 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:51:46,783 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:51:46,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,796 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,889 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,890 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,894 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,899 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,900 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... [2020-08-21 15:51:46,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:51:46,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:51:46,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:51:46,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:51:46,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:46,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:51:46,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:51:46,959 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:51:46,959 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:51:46,960 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 15:51:46,960 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:51:46,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:51:46,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:51:47,131 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:51:47,132 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 15:51:47,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:47 BoogieIcfgContainer [2020-08-21 15:51:47,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:51:47,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:51:47,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:51:47,140 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:51:47,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:51:46" (1/3) ... [2020-08-21 15:51:47,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2086e06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:47, skipping insertion in model container [2020-08-21 15:51:47,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:46" (2/3) ... [2020-08-21 15:51:47,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2086e06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:47, skipping insertion in model container [2020-08-21 15:51:47,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:47" (3/3) ... [2020-08-21 15:51:47,144 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-21 15:51:47,154 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:51:47,161 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:51:47,175 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:51:47,198 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:51:47,198 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:51:47,198 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:51:47,198 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:51:47,198 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:51:47,199 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:51:47,199 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:51:47,199 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:51:47,216 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 15:51:47,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 15:51:47,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:47,222 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:47,222 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:47,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:47,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-21 15:51:47,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:47,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063517014] [2020-08-21 15:51:47,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:47,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:47,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063517014] [2020-08-21 15:51:47,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:47,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 15:51:47,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648517389] [2020-08-21 15:51:47,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 15:51:47,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:47,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 15:51:47,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 15:51:47,354 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-21 15:51:47,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:47,375 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-21 15:51:47,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 15:51:47,376 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 15:51:47,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:47,384 INFO L225 Difference]: With dead ends: 32 [2020-08-21 15:51:47,384 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 15:51:47,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 15:51:47,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 15:51:47,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 15:51:47,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 15:51:47,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 15:51:47,425 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 15:51:47,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:47,426 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 15:51:47,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 15:51:47,426 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 15:51:47,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 15:51:47,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:47,427 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:47,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:51:47,428 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:47,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:47,429 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-21 15:51:47,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:47,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74583495] [2020-08-21 15:51:47,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:47,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:47,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74583495] [2020-08-21 15:51:47,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:47,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:51:47,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459492594] [2020-08-21 15:51:47,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:47,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:47,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:47,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:47,581 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 15:51:47,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:47,682 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 15:51:47,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:47,683 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 15:51:47,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:47,684 INFO L225 Difference]: With dead ends: 21 [2020-08-21 15:51:47,684 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 15:51:47,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:47,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 15:51:47,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 15:51:47,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 15:51:47,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 15:51:47,691 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-21 15:51:47,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:47,691 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 15:51:47,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:47,692 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 15:51:47,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:51:47,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:47,693 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:47,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:51:47,693 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:47,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:47,694 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-21 15:51:47,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:47,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135159064] [2020-08-21 15:51:47,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:47,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,789 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:47,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135159064] [2020-08-21 15:51:47,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:47,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:51:47,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768306055] [2020-08-21 15:51:47,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:51:47,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:47,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:51:47,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:47,792 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-21 15:51:47,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:47,859 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 15:51:47,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:51:47,859 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-21 15:51:47,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:47,860 INFO L225 Difference]: With dead ends: 24 [2020-08-21 15:51:47,861 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 15:51:47,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:47,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 15:51:47,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 15:51:47,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 15:51:47,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-21 15:51:47,867 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-21 15:51:47,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:47,868 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-21 15:51:47,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:47,868 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-21 15:51:47,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 15:51:47,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:47,869 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:47,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:51:47,870 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:47,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:47,871 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-21 15:51:47,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:47,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799001985] [2020-08-21 15:51:47,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:47,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,993 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:47,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799001985] [2020-08-21 15:51:47,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:47,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:47,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889725390] [2020-08-21 15:51:47,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:47,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:47,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:47,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:47,996 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-21 15:51:48,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:48,074 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 15:51:48,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:48,075 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 15:51:48,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:48,076 INFO L225 Difference]: With dead ends: 27 [2020-08-21 15:51:48,076 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 15:51:48,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:48,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 15:51:48,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 15:51:48,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 15:51:48,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-21 15:51:48,083 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-21 15:51:48,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:48,084 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-21 15:51:48,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:48,084 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-21 15:51:48,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 15:51:48,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,085 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:51:48,085 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:48,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:48,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-21 15:51:48,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:48,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266608674] [2020-08-21 15:51:48,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:48,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:48,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266608674] [2020-08-21 15:51:48,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:48,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:48,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948017075] [2020-08-21 15:51:48,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:48,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:48,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:48,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:48,205 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-21 15:51:48,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:48,301 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 15:51:48,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:48,302 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-21 15:51:48,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:48,303 INFO L225 Difference]: With dead ends: 30 [2020-08-21 15:51:48,303 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 15:51:48,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:48,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 15:51:48,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 15:51:48,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 15:51:48,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-21 15:51:48,310 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-21 15:51:48,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:48,310 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-21 15:51:48,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:48,310 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-21 15:51:48,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 15:51:48,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,311 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:51:48,312 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:48,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:48,313 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-21 15:51:48,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:48,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19616617] [2020-08-21 15:51:48,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:48,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:48,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,422 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:48,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19616617] [2020-08-21 15:51:48,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:48,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:48,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544602122] [2020-08-21 15:51:48,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:48,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:48,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:48,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:48,425 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-21 15:51:48,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:48,514 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-21 15:51:48,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:48,515 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-21 15:51:48,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:48,516 INFO L225 Difference]: With dead ends: 33 [2020-08-21 15:51:48,516 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 15:51:48,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:48,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 15:51:48,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 15:51:48,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:51:48,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-21 15:51:48,524 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-21 15:51:48,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:48,524 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-21 15:51:48,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:48,524 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-21 15:51:48,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 15:51:48,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,525 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:51:48,526 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:48,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:48,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-21 15:51:48,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:48,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831649961] [2020-08-21 15:51:48,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:48,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:48,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,660 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:48,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831649961] [2020-08-21 15:51:48,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:48,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:48,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504434103] [2020-08-21 15:51:48,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:48,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:48,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:48,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:48,663 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-21 15:51:48,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:48,784 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-21 15:51:48,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:48,785 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 15:51:48,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:48,786 INFO L225 Difference]: With dead ends: 36 [2020-08-21 15:51:48,786 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:51:48,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:48,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:51:48,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 15:51:48,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 15:51:48,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-21 15:51:48,793 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-21 15:51:48,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:48,794 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-21 15:51:48,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:48,794 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-21 15:51:48,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 15:51:48,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,795 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:51:48,796 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:48,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:48,796 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-21 15:51:48,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:48,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220130517] [2020-08-21 15:51:48,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:48,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:48,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,969 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:48,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220130517] [2020-08-21 15:51:48,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:48,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:48,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347390969] [2020-08-21 15:51:48,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:48,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:48,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:48,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:48,972 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-21 15:51:49,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,098 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-21 15:51:49,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:51:49,099 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 15:51:49,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,100 INFO L225 Difference]: With dead ends: 39 [2020-08-21 15:51:49,100 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 15:51:49,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:49,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 15:51:49,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 15:51:49,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:51:49,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 15:51:49,109 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-21 15:51:49,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,109 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 15:51:49,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:49,110 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 15:51:49,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 15:51:49,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,111 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:51:49,111 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-21 15:51:49,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687209275] [2020-08-21 15:51:49,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,283 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:49,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687209275] [2020-08-21 15:51:49,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:51:49,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386044139] [2020-08-21 15:51:49,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:51:49,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:51:49,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:49,286 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-21 15:51:49,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,443 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 15:51:49,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:49,444 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-21 15:51:49,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,445 INFO L225 Difference]: With dead ends: 42 [2020-08-21 15:51:49,445 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 15:51:49,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:49,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 15:51:49,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 15:51:49,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:51:49,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-21 15:51:49,452 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-21 15:51:49,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,452 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-21 15:51:49,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:51:49,453 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-21 15:51:49,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:51:49,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,454 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:51:49,454 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-21 15:51:49,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390868089] [2020-08-21 15:51:49,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:49,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390868089] [2020-08-21 15:51:49,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:49,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642856724] [2020-08-21 15:51:49,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:49,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:49,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:49,613 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-21 15:51:49,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,783 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-21 15:51:49,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:49,784 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 15:51:49,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,786 INFO L225 Difference]: With dead ends: 45 [2020-08-21 15:51:49,787 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:51:49,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:49,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:51:49,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 15:51:49,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:51:49,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-21 15:51:49,798 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-21 15:51:49,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,799 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-21 15:51:49,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:49,799 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-21 15:51:49,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 15:51:49,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,800 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:51:49,801 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,803 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-21 15:51:49,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406311238] [2020-08-21 15:51:49,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,006 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:50,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406311238] [2020-08-21 15:51:50,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:51:50,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750980329] [2020-08-21 15:51:50,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:51:50,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:51:50,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:50,009 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-21 15:51:50,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,203 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-21 15:51:50,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:50,203 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-21 15:51:50,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,204 INFO L225 Difference]: With dead ends: 48 [2020-08-21 15:51:50,205 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 15:51:50,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:50,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 15:51:50,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 15:51:50,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:51:50,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-21 15:51:50,216 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-21 15:51:50,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,216 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-21 15:51:50,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:51:50,216 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-21 15:51:50,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 15:51:50,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,218 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:51:50,218 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-21 15:51:50,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098168603] [2020-08-21 15:51:50,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,403 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:50,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098168603] [2020-08-21 15:51:50,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:51:50,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794290143] [2020-08-21 15:51:50,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:51:50,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:51:50,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:50,406 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-21 15:51:50,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,627 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-21 15:51:50,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:51:50,627 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-21 15:51:50,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,628 INFO L225 Difference]: With dead ends: 51 [2020-08-21 15:51:50,628 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:51:50,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:50,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:51:50,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 15:51:50,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:51:50,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-21 15:51:50,636 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-21 15:51:50,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,636 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-21 15:51:50,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:51:50,636 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-21 15:51:50,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 15:51:50,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,638 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:51:50,638 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-21 15:51:50,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107317901] [2020-08-21 15:51:50,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,834 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:50,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107317901] [2020-08-21 15:51:50,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:51:50,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112441596] [2020-08-21 15:51:50,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:51:50,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:51:50,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:50,837 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-21 15:51:51,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:51,178 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-21 15:51:51,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:51,179 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-21 15:51:51,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:51,180 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:51:51,180 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:51:51,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:51,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:51:51,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:51:51,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:51:51,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-21 15:51:51,188 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-21 15:51:51,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:51,188 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-21 15:51:51,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:51:51,188 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-21 15:51:51,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:51:51,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:51,189 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:51,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:51:51,190 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:51,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:51,190 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-21 15:51:51,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:51,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791023733] [2020-08-21 15:51:51,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,412 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:51,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791023733] [2020-08-21 15:51:51,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:51:51,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275502577] [2020-08-21 15:51:51,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:51:51,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:51:51,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:51,415 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-21 15:51:51,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:51,708 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-21 15:51:51,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:51:51,709 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 15:51:51,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:51,710 INFO L225 Difference]: With dead ends: 57 [2020-08-21 15:51:51,710 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:51:51,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:51,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:51:51,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 15:51:51,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 15:51:51,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-21 15:51:51,721 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-21 15:51:51,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:51,721 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-21 15:51:51,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:51:51,721 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-21 15:51:51,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 15:51:51,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:51,724 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:51,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:51:51,725 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:51,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:51,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-21 15:51:51,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:51,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990814455] [2020-08-21 15:51:51,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,985 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:51,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990814455] [2020-08-21 15:51:51,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:51:51,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118205520] [2020-08-21 15:51:51,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:51:51,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:51:51,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:51,988 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-21 15:51:52,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:52,319 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-21 15:51:52,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:51:52,319 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-21 15:51:52,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:52,320 INFO L225 Difference]: With dead ends: 60 [2020-08-21 15:51:52,320 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 15:51:52,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:52,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 15:51:52,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 15:51:52,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:51:52,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-21 15:51:52,336 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-21 15:51:52,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:52,337 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-21 15:51:52,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:51:52,337 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-21 15:51:52,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 15:51:52,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:52,341 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:52,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:51:52,342 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:52,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:52,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-21 15:51:52,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:52,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831147243] [2020-08-21 15:51:52,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:52,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,638 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:52,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831147243] [2020-08-21 15:51:52,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:52,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:51:52,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584900364] [2020-08-21 15:51:52,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:51:52,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:52,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:51:52,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:52,641 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-21 15:51:52,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:52,965 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 15:51:52,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:51:52,965 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-21 15:51:52,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:52,966 INFO L225 Difference]: With dead ends: 63 [2020-08-21 15:51:52,966 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 15:51:52,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:52,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 15:51:52,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 15:51:52,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 15:51:52,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-21 15:51:52,980 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-21 15:51:52,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:52,980 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-21 15:51:52,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:51:52,981 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-21 15:51:52,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 15:51:52,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:52,982 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:52,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:51:52,982 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:52,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:52,982 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-21 15:51:52,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:52,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96136892] [2020-08-21 15:51:52,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:53,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:53,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:53,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:53,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96136892] [2020-08-21 15:51:53,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:53,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:51:53,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958027125] [2020-08-21 15:51:53,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:51:53,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:53,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:51:53,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:53,280 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-21 15:51:53,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:53,664 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-21 15:51:53,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:51:53,664 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-21 15:51:53,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:53,665 INFO L225 Difference]: With dead ends: 66 [2020-08-21 15:51:53,665 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 15:51:53,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:53,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 15:51:53,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 15:51:53,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 15:51:53,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-21 15:51:53,673 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-21 15:51:53,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:53,674 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-21 15:51:53,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:51:53,674 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-21 15:51:53,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 15:51:53,675 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:53,675 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:53,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:51:53,676 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:53,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:53,676 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-21 15:51:53,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:53,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670713023] [2020-08-21 15:51:53,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:53,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:53,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,010 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:54,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670713023] [2020-08-21 15:51:54,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:54,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:51:54,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599323010] [2020-08-21 15:51:54,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:51:54,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:54,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:51:54,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:54,013 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-21 15:51:54,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:54,431 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-21 15:51:54,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:51:54,432 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-21 15:51:54,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:54,433 INFO L225 Difference]: With dead ends: 69 [2020-08-21 15:51:54,433 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 15:51:54,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:54,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 15:51:54,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-21 15:51:54,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 15:51:54,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-21 15:51:54,451 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-21 15:51:54,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:54,451 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-21 15:51:54,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:51:54,451 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-21 15:51:54,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 15:51:54,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:54,453 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:54,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:51:54,453 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:54,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:54,453 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-21 15:51:54,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:54,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986315459] [2020-08-21 15:51:54,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:54,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:54,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,889 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:54,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986315459] [2020-08-21 15:51:54,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:54,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:51:54,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249435879] [2020-08-21 15:51:54,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:51:54,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:54,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:51:54,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:54,892 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-21 15:51:55,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:55,382 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-21 15:51:55,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:51:55,383 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-21 15:51:55,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:55,383 INFO L225 Difference]: With dead ends: 72 [2020-08-21 15:51:55,384 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 15:51:55,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:55,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 15:51:55,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-21 15:51:55,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 15:51:55,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-21 15:51:55,392 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-21 15:51:55,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:55,392 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-21 15:51:55,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:51:55,392 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-21 15:51:55,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 15:51:55,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:55,393 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:55,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:51:55,394 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:55,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:55,394 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-21 15:51:55,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:55,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269639029] [2020-08-21 15:51:55,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:55,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:55,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,779 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:55,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269639029] [2020-08-21 15:51:55,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:55,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:51:55,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331750381] [2020-08-21 15:51:55,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:51:55,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:55,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:51:55,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:55,782 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-21 15:51:56,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:56,312 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-21 15:51:56,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:51:56,313 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-21 15:51:56,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:56,314 INFO L225 Difference]: With dead ends: 75 [2020-08-21 15:51:56,314 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 15:51:56,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:56,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 15:51:56,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-21 15:51:56,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 15:51:56,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-21 15:51:56,325 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-21 15:51:56,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:56,326 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-21 15:51:56,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:51:56,326 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-21 15:51:56,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 15:51:56,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:56,327 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:56,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:51:56,328 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:56,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:56,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-21 15:51:56,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:56,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784312898] [2020-08-21 15:51:56,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:56,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:56,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,771 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:56,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784312898] [2020-08-21 15:51:56,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:56,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:51:56,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732073565] [2020-08-21 15:51:56,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:51:56,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:56,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:51:56,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:56,774 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-21 15:51:57,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:57,386 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-21 15:51:57,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:51:57,387 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-21 15:51:57,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:57,388 INFO L225 Difference]: With dead ends: 78 [2020-08-21 15:51:57,388 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 15:51:57,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:57,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 15:51:57,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-21 15:51:57,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 15:51:57,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-21 15:51:57,400 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-21 15:51:57,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:57,400 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-21 15:51:57,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:51:57,400 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-21 15:51:57,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 15:51:57,401 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:57,401 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:57,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:51:57,402 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:57,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:57,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-21 15:51:57,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:57,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726226256] [2020-08-21 15:51:57,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:57,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:57,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:57,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:57,822 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:57,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726226256] [2020-08-21 15:51:57,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:57,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:51:57,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807419410] [2020-08-21 15:51:57,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:51:57,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:57,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:51:57,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:57,826 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-21 15:51:58,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:58,472 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-21 15:51:58,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:51:58,475 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-21 15:51:58,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:58,476 INFO L225 Difference]: With dead ends: 81 [2020-08-21 15:51:58,476 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 15:51:58,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:58,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 15:51:58,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-21 15:51:58,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 15:51:58,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-21 15:51:58,484 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-21 15:51:58,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:58,484 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-21 15:51:58,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:51:58,484 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-21 15:51:58,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 15:51:58,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:58,485 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:58,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:51:58,486 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:58,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:58,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-21 15:51:58,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:58,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574554708] [2020-08-21 15:51:58,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:58,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:58,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:58,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:58,983 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:58,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574554708] [2020-08-21 15:51:58,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:58,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 15:51:58,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252697997] [2020-08-21 15:51:58,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 15:51:58,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:58,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 15:51:58,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:58,986 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-21 15:51:59,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:59,695 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-21 15:51:59,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 15:51:59,696 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-21 15:51:59,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:59,697 INFO L225 Difference]: With dead ends: 84 [2020-08-21 15:51:59,697 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 15:51:59,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:59,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 15:51:59,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-21 15:51:59,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 15:51:59,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-21 15:51:59,708 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-21 15:51:59,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:59,708 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-21 15:51:59,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 15:51:59,708 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-21 15:51:59,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 15:51:59,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:59,709 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:59,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:51:59,710 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:59,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:59,710 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-21 15:51:59,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:59,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866631168] [2020-08-21 15:51:59,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:59,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:00,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:00,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:00,432 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:00,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866631168] [2020-08-21 15:52:00,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:00,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 15:52:00,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491871598] [2020-08-21 15:52:00,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 15:52:00,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:00,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 15:52:00,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:52:00,435 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-21 15:52:01,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:01,373 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-21 15:52:01,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 15:52:01,374 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-21 15:52:01,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:01,376 INFO L225 Difference]: With dead ends: 87 [2020-08-21 15:52:01,376 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 15:52:01,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:52:01,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 15:52:01,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-21 15:52:01,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 15:52:01,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-21 15:52:01,387 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-21 15:52:01,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:01,388 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-21 15:52:01,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 15:52:01,388 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-21 15:52:01,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 15:52:01,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:01,390 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:01,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:52:01,394 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:01,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:01,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-21 15:52:01,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:01,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418599002] [2020-08-21 15:52:01,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:01,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:01,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,901 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:01,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418599002] [2020-08-21 15:52:01,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:01,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 15:52:01,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252728419] [2020-08-21 15:52:01,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 15:52:01,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:01,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 15:52:01,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:52:01,904 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-21 15:52:02,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:02,740 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-21 15:52:02,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 15:52:02,740 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-21 15:52:02,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:02,742 INFO L225 Difference]: With dead ends: 90 [2020-08-21 15:52:02,742 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 15:52:02,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:52:02,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 15:52:02,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 15:52:02,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 15:52:02,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-21 15:52:02,749 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-21 15:52:02,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:02,750 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-21 15:52:02,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 15:52:02,750 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-21 15:52:02,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 15:52:02,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:02,751 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:02,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:52:02,751 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:02,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:02,752 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-21 15:52:02,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:02,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151511072] [2020-08-21 15:52:02,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:03,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:03,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:03,319 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:03,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151511072] [2020-08-21 15:52:03,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:03,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 15:52:03,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810748902] [2020-08-21 15:52:03,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 15:52:03,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:03,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 15:52:03,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:52:03,321 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-21 15:52:04,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:04,269 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 15:52:04,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 15:52:04,269 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-21 15:52:04,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:04,271 INFO L225 Difference]: With dead ends: 93 [2020-08-21 15:52:04,271 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 15:52:04,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:52:04,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 15:52:04,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 15:52:04,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 15:52:04,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-21 15:52:04,280 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-21 15:52:04,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:04,280 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-21 15:52:04,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 15:52:04,281 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-21 15:52:04,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 15:52:04,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:04,282 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:04,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:52:04,282 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:04,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:04,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-21 15:52:04,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:04,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023760766] [2020-08-21 15:52:04,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:04,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:04,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:04,896 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:04,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023760766] [2020-08-21 15:52:04,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:04,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 15:52:04,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118230183] [2020-08-21 15:52:04,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 15:52:04,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:04,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 15:52:04,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:52:04,901 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-21 15:52:05,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:05,841 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-21 15:52:05,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 15:52:05,841 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-21 15:52:05,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:05,843 INFO L225 Difference]: With dead ends: 96 [2020-08-21 15:52:05,843 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 15:52:05,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:52:05,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 15:52:05,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-21 15:52:05,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 15:52:05,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-21 15:52:05,851 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-21 15:52:05,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:05,851 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-21 15:52:05,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 15:52:05,852 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-21 15:52:05,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 15:52:05,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:05,853 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:05,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:52:05,853 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:05,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:05,853 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-21 15:52:05,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:05,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508536325] [2020-08-21 15:52:05,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:05,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:06,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:06,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:06,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:06,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508536325] [2020-08-21 15:52:06,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:06,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 15:52:06,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884193347] [2020-08-21 15:52:06,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 15:52:06,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:06,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 15:52:06,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:52:06,452 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-21 15:52:07,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:07,543 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-21 15:52:07,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 15:52:07,544 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-21 15:52:07,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:07,546 INFO L225 Difference]: With dead ends: 99 [2020-08-21 15:52:07,546 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 15:52:07,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:52:07,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 15:52:07,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-21 15:52:07,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 15:52:07,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-21 15:52:07,555 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-21 15:52:07,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:07,556 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-21 15:52:07,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 15:52:07,556 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-21 15:52:07,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-21 15:52:07,557 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:07,557 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:07,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:52:07,557 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:07,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:07,557 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-21 15:52:07,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:07,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565329649] [2020-08-21 15:52:07,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:07,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:08,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:08,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:08,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565329649] [2020-08-21 15:52:08,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:08,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 15:52:08,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228180681] [2020-08-21 15:52:08,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 15:52:08,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:08,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 15:52:08,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:52:08,271 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-21 15:52:09,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:09,404 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-21 15:52:09,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 15:52:09,405 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-21 15:52:09,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:09,406 INFO L225 Difference]: With dead ends: 102 [2020-08-21 15:52:09,407 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 15:52:09,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:52:09,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 15:52:09,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-21 15:52:09,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 15:52:09,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-21 15:52:09,417 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-21 15:52:09,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:09,417 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-21 15:52:09,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 15:52:09,417 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-21 15:52:09,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 15:52:09,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:09,418 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:09,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 15:52:09,419 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:09,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:09,419 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-21 15:52:09,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:09,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652815746] [2020-08-21 15:52:09,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:09,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:10,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:10,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:10,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:10,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652815746] [2020-08-21 15:52:10,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:10,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 15:52:10,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111451966] [2020-08-21 15:52:10,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 15:52:10,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:10,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 15:52:10,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:52:10,193 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-21 15:52:11,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:11,417 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-21 15:52:11,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 15:52:11,417 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-21 15:52:11,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:11,418 INFO L225 Difference]: With dead ends: 105 [2020-08-21 15:52:11,418 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 15:52:11,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:52:11,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 15:52:11,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-21 15:52:11,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-21 15:52:11,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-21 15:52:11,428 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-21 15:52:11,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:11,428 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-21 15:52:11,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 15:52:11,429 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-21 15:52:11,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-21 15:52:11,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:11,429 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:11,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 15:52:11,430 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:11,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:11,430 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-21 15:52:11,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:11,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909939023] [2020-08-21 15:52:11,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:11,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:12,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:12,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:12,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:12,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909939023] [2020-08-21 15:52:12,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:12,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 15:52:12,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213541796] [2020-08-21 15:52:12,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 15:52:12,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:12,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 15:52:12,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:52:12,236 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-21 15:52:13,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:13,540 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-21 15:52:13,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 15:52:13,541 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-21 15:52:13,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:13,543 INFO L225 Difference]: With dead ends: 108 [2020-08-21 15:52:13,543 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 15:52:13,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:52:13,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 15:52:13,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-21 15:52:13,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 15:52:13,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-21 15:52:13,554 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-21 15:52:13,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:13,554 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-21 15:52:13,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 15:52:13,554 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-21 15:52:13,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 15:52:13,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:13,555 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:13,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 15:52:13,556 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:13,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:13,556 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-21 15:52:13,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:13,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449560142] [2020-08-21 15:52:13,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:13,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:14,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:14,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:14,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:14,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449560142] [2020-08-21 15:52:14,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:14,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 15:52:14,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958626631] [2020-08-21 15:52:14,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 15:52:14,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:14,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 15:52:14,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:52:14,410 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-21 15:52:15,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:15,801 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-21 15:52:15,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 15:52:15,809 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-21 15:52:15,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:15,810 INFO L225 Difference]: With dead ends: 111 [2020-08-21 15:52:15,811 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 15:52:15,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:52:15,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 15:52:15,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-21 15:52:15,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-21 15:52:15,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-21 15:52:15,822 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-21 15:52:15,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:15,822 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-21 15:52:15,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 15:52:15,823 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-21 15:52:15,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-21 15:52:15,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:15,824 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:15,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 15:52:15,824 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:15,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:15,824 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-21 15:52:15,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:15,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854262427] [2020-08-21 15:52:15,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:15,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:16,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:16,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:16,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:16,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854262427] [2020-08-21 15:52:16,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:16,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 15:52:16,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799349965] [2020-08-21 15:52:16,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 15:52:16,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:16,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 15:52:16,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:52:16,711 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-21 15:52:18,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:18,214 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-21 15:52:18,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 15:52:18,215 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-21 15:52:18,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:18,216 INFO L225 Difference]: With dead ends: 114 [2020-08-21 15:52:18,216 INFO L226 Difference]: Without dead ends: 109 [2020-08-21 15:52:18,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:52:18,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-21 15:52:18,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-21 15:52:18,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 15:52:18,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-21 15:52:18,226 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-21 15:52:18,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:18,226 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-21 15:52:18,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 15:52:18,227 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-21 15:52:18,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 15:52:18,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:18,228 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:18,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 15:52:18,228 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:18,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:18,228 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-21 15:52:18,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:18,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488123289] [2020-08-21 15:52:18,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:18,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:19,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:19,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:19,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:19,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488123289] [2020-08-21 15:52:19,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:19,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 15:52:19,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796731776] [2020-08-21 15:52:19,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 15:52:19,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:19,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 15:52:19,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:52:19,178 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-21 15:52:20,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:20,760 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-21 15:52:20,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 15:52:20,761 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-21 15:52:20,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:20,762 INFO L225 Difference]: With dead ends: 117 [2020-08-21 15:52:20,762 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 15:52:20,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:52:20,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 15:52:20,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-21 15:52:20,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 15:52:20,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-21 15:52:20,772 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-21 15:52:20,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:20,773 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-21 15:52:20,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 15:52:20,773 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-21 15:52:20,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-21 15:52:20,774 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:20,774 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:20,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 15:52:20,774 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:20,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:20,775 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-21 15:52:20,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:20,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936757114] [2020-08-21 15:52:20,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:20,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:21,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:21,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:21,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936757114] [2020-08-21 15:52:21,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:21,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 15:52:21,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105017701] [2020-08-21 15:52:21,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 15:52:21,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:21,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 15:52:21,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:52:21,736 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-21 15:52:23,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:23,439 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-21 15:52:23,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 15:52:23,440 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-21 15:52:23,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:23,441 INFO L225 Difference]: With dead ends: 120 [2020-08-21 15:52:23,441 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 15:52:23,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:52:23,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 15:52:23,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-21 15:52:23,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 15:52:23,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-21 15:52:23,453 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-21 15:52:23,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:23,453 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-21 15:52:23,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 15:52:23,453 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-21 15:52:23,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 15:52:23,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:23,454 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:23,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 15:52:23,455 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:23,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:23,455 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-21 15:52:23,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:23,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716301950] [2020-08-21 15:52:23,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:23,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:24,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:24,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:24,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:24,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716301950] [2020-08-21 15:52:24,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:24,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 15:52:24,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164018527] [2020-08-21 15:52:24,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 15:52:24,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:24,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 15:52:24,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:52:24,494 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-21 15:52:26,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:26,309 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-21 15:52:26,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 15:52:26,310 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-21 15:52:26,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:26,312 INFO L225 Difference]: With dead ends: 123 [2020-08-21 15:52:26,312 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 15:52:26,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:52:26,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 15:52:26,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-21 15:52:26,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-21 15:52:26,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-21 15:52:26,322 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-21 15:52:26,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:26,323 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-21 15:52:26,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 15:52:26,323 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-21 15:52:26,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-21 15:52:26,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:26,324 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:26,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 15:52:26,324 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:26,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:26,324 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-21 15:52:26,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:26,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150625857] [2020-08-21 15:52:26,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:26,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:27,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:27,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:27,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:27,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150625857] [2020-08-21 15:52:27,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:27,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 15:52:27,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319337964] [2020-08-21 15:52:27,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 15:52:27,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:27,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 15:52:27,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:52:27,449 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-21 15:52:29,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:29,335 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-21 15:52:29,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 15:52:29,338 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-21 15:52:29,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:29,339 INFO L225 Difference]: With dead ends: 126 [2020-08-21 15:52:29,339 INFO L226 Difference]: Without dead ends: 121 [2020-08-21 15:52:29,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:52:29,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-21 15:52:29,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-21 15:52:29,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 15:52:29,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-21 15:52:29,349 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-21 15:52:29,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:29,349 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-21 15:52:29,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 15:52:29,349 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-21 15:52:29,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 15:52:29,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:29,350 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:29,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 15:52:29,351 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:29,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:29,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-21 15:52:29,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:29,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925462788] [2020-08-21 15:52:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:29,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:30,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:30,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:30,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:30,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925462788] [2020-08-21 15:52:30,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:30,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 15:52:30,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085353279] [2020-08-21 15:52:30,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 15:52:30,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:30,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 15:52:30,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:52:30,523 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-21 15:52:32,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:32,579 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-21 15:52:32,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 15:52:32,580 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-21 15:52:32,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:32,581 INFO L225 Difference]: With dead ends: 129 [2020-08-21 15:52:32,581 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 15:52:32,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:52:32,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 15:52:32,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-21 15:52:32,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-21 15:52:32,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-21 15:52:32,592 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-21 15:52:32,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:32,592 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-21 15:52:32,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 15:52:32,592 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-21 15:52:32,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-21 15:52:32,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:32,593 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:32,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 15:52:32,593 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:32,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:32,594 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-21 15:52:32,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:32,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689268390] [2020-08-21 15:52:32,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:32,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:33,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:33,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:33,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:33,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689268390] [2020-08-21 15:52:33,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:33,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 15:52:33,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964561361] [2020-08-21 15:52:33,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 15:52:33,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:33,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 15:52:33,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:52:33,823 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-21 15:52:35,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:35,942 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-21 15:52:35,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 15:52:35,943 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-21 15:52:35,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:35,945 INFO L225 Difference]: With dead ends: 132 [2020-08-21 15:52:35,945 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 15:52:35,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:52:35,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 15:52:35,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-21 15:52:35,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 15:52:35,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-21 15:52:35,956 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-21 15:52:35,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:35,956 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-21 15:52:35,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 15:52:35,956 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-21 15:52:35,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 15:52:35,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:35,957 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:35,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 15:52:35,958 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:35,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:35,958 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-21 15:52:35,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:35,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129856133] [2020-08-21 15:52:35,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:35,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:37,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:37,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:37,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129856133] [2020-08-21 15:52:37,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:37,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 15:52:37,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282000945] [2020-08-21 15:52:37,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 15:52:37,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:37,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 15:52:37,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:52:37,315 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-21 15:52:39,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:39,562 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-21 15:52:39,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 15:52:39,563 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-21 15:52:39,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:39,564 INFO L225 Difference]: With dead ends: 135 [2020-08-21 15:52:39,564 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 15:52:39,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 15:52:39,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 15:52:39,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-21 15:52:39,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-21 15:52:39,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-21 15:52:39,576 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-21 15:52:39,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:39,577 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-21 15:52:39,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 15:52:39,577 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-21 15:52:39,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-21 15:52:39,578 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:39,578 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:39,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 15:52:39,578 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:39,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:39,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-21 15:52:39,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:39,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765535885] [2020-08-21 15:52:39,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:39,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:40,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:40,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:40,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:40,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765535885] [2020-08-21 15:52:40,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:40,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 15:52:40,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518573418] [2020-08-21 15:52:40,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 15:52:40,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:40,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 15:52:40,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 15:52:40,933 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-21 15:52:43,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:43,298 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-21 15:52:43,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 15:52:43,299 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-21 15:52:43,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:43,301 INFO L225 Difference]: With dead ends: 138 [2020-08-21 15:52:43,301 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 15:52:43,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 15:52:43,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 15:52:43,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-21 15:52:43,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 15:52:43,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-21 15:52:43,315 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-21 15:52:43,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:43,315 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-21 15:52:43,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 15:52:43,315 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-21 15:52:43,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 15:52:43,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:43,316 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:43,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 15:52:43,317 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:43,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:43,317 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-21 15:52:43,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:43,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [513428342] [2020-08-21 15:52:43,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:43,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:44,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:44,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:44,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:44,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [513428342] [2020-08-21 15:52:44,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:44,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 15:52:44,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576526278] [2020-08-21 15:52:44,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 15:52:44,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:44,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 15:52:44,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 15:52:44,776 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.