/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:29:47,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:29:47,152 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:29:47,176 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:29:47,176 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:29:47,177 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:29:47,179 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:29:47,180 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:29:47,182 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:29:47,187 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:29:47,188 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:29:47,191 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:29:47,191 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:29:47,192 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:29:47,195 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:29:47,197 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:29:47,198 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:29:47,200 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:29:47,205 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:29:47,208 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:29:47,213 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:29:47,214 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:29:47,217 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:29:47,218 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:29:47,220 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:29:47,241 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:29:47,241 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:29:47,246 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:29:47,248 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:29:47,287 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:29:47,287 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:29:47,291 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:29:47,291 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:29:47,291 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:29:47,291 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:29:47,292 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:29:47,292 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:29:47,292 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:29:47,292 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:29:47,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:29:47,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:29:47,294 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:29:47,294 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:29:47,294 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:29:47,294 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:29:47,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:29:47,295 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:29:47,295 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:29:47,295 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:29:47,295 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:29:47,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:47,296 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:29:47,296 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:29:47,296 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:29:47,297 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:29:47,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:29:47,297 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:29:47,297 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:29:47,297 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:29:47,580 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:29:47,594 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:29:47,598 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:29:47,600 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:29:47,600 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:29:47,601 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 21:29:47,670 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/62e90f929/7344f8222acb456297154c660df4584d/FLAG150f20182 [2020-08-21 21:29:48,128 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:29:48,129 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 21:29:48,135 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/62e90f929/7344f8222acb456297154c660df4584d/FLAG150f20182 [2020-08-21 21:29:48,539 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/62e90f929/7344f8222acb456297154c660df4584d [2020-08-21 21:29:48,550 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:29:48,552 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:29:48,553 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:48,553 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:29:48,557 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:29:48,558 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,561 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41e8bb43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48, skipping insertion in model container [2020-08-21 21:29:48,561 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,569 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:29:48,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:29:48,802 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:48,806 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:29:48,822 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:48,836 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:29:48,837 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48 WrapperNode [2020-08-21 21:29:48,837 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:48,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:29:48,838 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:29:48,838 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:29:48,850 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,855 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,933 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,940 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,941 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... [2020-08-21 21:29:48,942 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:29:48,943 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:29:48,943 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:29:48,943 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:29:48,944 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:49,005 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:29:49,005 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:29:49,005 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:29:49,006 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:29:49,006 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:29:49,006 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:29:49,006 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:29:49,006 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:29:49,006 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:29:49,193 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:29:49,193 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 21:29:49,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:49 BoogieIcfgContainer [2020-08-21 21:29:49,197 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:29:49,198 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:29:49,198 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:29:49,202 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:29:49,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:29:48" (1/3) ... [2020-08-21 21:29:49,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fae70f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:49, skipping insertion in model container [2020-08-21 21:29:49,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:48" (2/3) ... [2020-08-21 21:29:49,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fae70f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:49, skipping insertion in model container [2020-08-21 21:29:49,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:49" (3/3) ... [2020-08-21 21:29:49,205 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 21:29:49,217 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:29:49,224 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:29:49,239 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:29:49,264 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:29:49,265 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:29:49,265 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:29:49,265 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:29:49,265 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:29:49,265 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:29:49,266 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:29:49,266 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:29:49,284 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 21:29:49,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 21:29:49,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,290 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,291 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 21:29:49,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188408129] [2020-08-21 21:29:49,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:49,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188408129] [2020-08-21 21:29:49,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:49,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:29:49,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012156992] [2020-08-21 21:29:49,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:29:49,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:29:49,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:49,569 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 21:29:49,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,618 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 21:29:49,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:29:49,628 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 21:29:49,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,635 INFO L225 Difference]: With dead ends: 29 [2020-08-21 21:29:49,635 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 21:29:49,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:49,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 21:29:49,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 21:29:49,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 21:29:49,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 21:29:49,671 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 21:29:49,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,671 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 21:29:49,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:29:49,672 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 21:29:49,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 21:29:49,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,673 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:29:49,673 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 21:29:49,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367293938] [2020-08-21 21:29:49,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:49,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367293938] [2020-08-21 21:29:49,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 21:29:49,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740476797] [2020-08-21 21:29:49,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:49,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:49,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:49,773 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 21:29:49,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,795 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 21:29:49,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:29:49,796 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 21:29:49,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,797 INFO L225 Difference]: With dead ends: 18 [2020-08-21 21:29:49,797 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 21:29:49,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:49,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 21:29:49,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 21:29:49,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 21:29:49,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 21:29:49,804 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 21:29:49,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,804 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 21:29:49,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:49,805 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 21:29:49,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:29:49,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,805 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:29:49,806 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 21:29:49,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122242478] [2020-08-21 21:29:49,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:49,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:49,929 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 21:29:49,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122242478] [2020-08-21 21:29:49,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:49,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:29:49,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128123600] [2020-08-21 21:29:49,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:29:49,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:49,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:29:49,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:49,933 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 21:29:49,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:49,959 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 21:29:49,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:49,960 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 21:29:49,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:49,961 INFO L225 Difference]: With dead ends: 19 [2020-08-21 21:29:49,961 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 21:29:49,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:49,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 21:29:49,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 21:29:49,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 21:29:49,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 21:29:49,968 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 21:29:49,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:49,968 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 21:29:49,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:29:49,968 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 21:29:49,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 21:29:49,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:49,969 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:49,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:29:49,970 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:49,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:49,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 21:29:49,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:49,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005681741] [2020-08-21 21:29:49,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:49,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,100 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005681741] [2020-08-21 21:29:50,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:29:50,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162338094] [2020-08-21 21:29:50,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:29:50,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:29:50,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:50,103 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 21:29:50,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,131 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 21:29:50,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:29:50,132 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 21:29:50,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,133 INFO L225 Difference]: With dead ends: 20 [2020-08-21 21:29:50,133 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 21:29:50,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:50,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 21:29:50,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 21:29:50,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 21:29:50,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 21:29:50,139 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 21:29:50,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,140 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 21:29:50,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:29:50,140 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 21:29:50,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 21:29:50,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,141 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:29:50,141 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 21:29:50,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372252053] [2020-08-21 21:29:50,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,254 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372252053] [2020-08-21 21:29:50,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:29:50,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8667838] [2020-08-21 21:29:50,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:29:50,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:29:50,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:50,257 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 21:29:50,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,297 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 21:29:50,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:29:50,298 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 21:29:50,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,299 INFO L225 Difference]: With dead ends: 21 [2020-08-21 21:29:50,299 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 21:29:50,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:50,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 21:29:50,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 21:29:50,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 21:29:50,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 21:29:50,306 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 21:29:50,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,307 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 21:29:50,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:29:50,307 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 21:29:50,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 21:29:50,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,308 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:29:50,309 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 21:29:50,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035479778] [2020-08-21 21:29:50,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035479778] [2020-08-21 21:29:50,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:29:50,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059124197] [2020-08-21 21:29:50,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:29:50,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:29:50,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:50,493 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 21:29:50,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,543 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 21:29:50,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:29:50,544 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 21:29:50,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,545 INFO L225 Difference]: With dead ends: 22 [2020-08-21 21:29:50,545 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 21:29:50,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:50,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 21:29:50,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 21:29:50,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 21:29:50,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 21:29:50,551 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 21:29:50,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,552 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 21:29:50,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:29:50,552 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 21:29:50,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 21:29:50,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,553 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:29:50,553 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 21:29:50,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342383530] [2020-08-21 21:29:50,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,714 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342383530] [2020-08-21 21:29:50,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:29:50,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466581209] [2020-08-21 21:29:50,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:29:50,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:29:50,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:50,717 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 21:29:50,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,766 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 21:29:50,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:29:50,767 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 21:29:50,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,767 INFO L225 Difference]: With dead ends: 23 [2020-08-21 21:29:50,767 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 21:29:50,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:50,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 21:29:50,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 21:29:50,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 21:29:50,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 21:29:50,773 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 21:29:50,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:50,774 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 21:29:50,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:29:50,774 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 21:29:50,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:29:50,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:50,775 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:50,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:29:50,776 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:50,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:50,776 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 21:29:50,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:50,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911637793] [2020-08-21 21:29:50,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:50,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:50,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:50,933 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:50,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911637793] [2020-08-21 21:29:50,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:50,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:29:50,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115630068] [2020-08-21 21:29:50,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:29:50,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:50,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:29:50,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:50,935 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 21:29:50,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:50,995 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 21:29:50,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:29:50,997 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 21:29:50,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:50,998 INFO L225 Difference]: With dead ends: 24 [2020-08-21 21:29:50,998 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 21:29:51,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:51,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 21:29:51,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 21:29:51,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 21:29:51,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 21:29:51,009 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 21:29:51,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,011 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 21:29:51,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:29:51,011 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 21:29:51,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:29:51,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,012 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:29:51,012 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,013 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 21:29:51,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305167622] [2020-08-21 21:29:51,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,203 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:51,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305167622] [2020-08-21 21:29:51,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:29:51,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216758440] [2020-08-21 21:29:51,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:29:51,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:29:51,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:51,206 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 21:29:51,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,279 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 21:29:51,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:29:51,279 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 21:29:51,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,280 INFO L225 Difference]: With dead ends: 25 [2020-08-21 21:29:51,280 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:29:51,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:51,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:29:51,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 21:29:51,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:29:51,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 21:29:51,286 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 21:29:51,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,287 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 21:29:51,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:29:51,287 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 21:29:51,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 21:29:51,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,288 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:29:51,288 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,289 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 21:29:51,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591706054] [2020-08-21 21:29:51,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,494 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 21:29:51,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591706054] [2020-08-21 21:29:51,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:29:51,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400800277] [2020-08-21 21:29:51,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:29:51,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:29:51,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:51,497 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 21:29:51,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,577 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 21:29:51,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:29:51,577 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 21:29:51,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,578 INFO L225 Difference]: With dead ends: 26 [2020-08-21 21:29:51,578 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 21:29:51,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:51,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 21:29:51,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 21:29:51,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:29:51,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 21:29:51,587 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 21:29:51,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,587 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 21:29:51,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:29:51,587 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 21:29:51,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:29:51,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,588 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:29:51,592 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 21:29:51,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44568043] [2020-08-21 21:29:51,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:51,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:51,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44568043] [2020-08-21 21:29:51,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:51,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:29:51,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273001800] [2020-08-21 21:29:51,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:29:51,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:51,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:29:51,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:51,839 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 21:29:51,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:51,949 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 21:29:51,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:29:51,951 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 21:29:51,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:51,952 INFO L225 Difference]: With dead ends: 27 [2020-08-21 21:29:51,952 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:29:51,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:51,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:29:51,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 21:29:51,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 21:29:51,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 21:29:51,963 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 21:29:51,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:51,964 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 21:29:51,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:29:51,964 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 21:29:51,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 21:29:51,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:51,965 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:51,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:29:51,965 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:51,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:51,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 21:29:51,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:51,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051485527] [2020-08-21 21:29:51,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:51,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051485527] [2020-08-21 21:29:52,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:29:52,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894623447] [2020-08-21 21:29:52,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:29:52,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:29:52,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:52,189 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 21:29:52,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,288 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 21:29:52,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:29:52,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 21:29:52,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,291 INFO L225 Difference]: With dead ends: 28 [2020-08-21 21:29:52,291 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 21:29:52,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:52,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 21:29:52,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 21:29:52,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 21:29:52,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 21:29:52,298 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 21:29:52,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,300 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 21:29:52,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:29:52,301 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 21:29:52,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:29:52,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,301 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:29:52,302 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,302 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 21:29:52,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405620381] [2020-08-21 21:29:52,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,545 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405620381] [2020-08-21 21:29:52,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:29:52,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178746190] [2020-08-21 21:29:52,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:29:52,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:29:52,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:52,551 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 21:29:52,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:52,684 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 21:29:52,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:29:52,684 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 21:29:52,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:52,685 INFO L225 Difference]: With dead ends: 29 [2020-08-21 21:29:52,685 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 21:29:52,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:52,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 21:29:52,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 21:29:52,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 21:29:52,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 21:29:52,691 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 21:29:52,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:52,691 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 21:29:52,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:29:52,691 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 21:29:52,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 21:29:52,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:52,692 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:52,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:29:52,692 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:52,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:52,693 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 21:29:52,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:52,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657033260] [2020-08-21 21:29:52,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:52,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:52,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:52,941 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:52,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657033260] [2020-08-21 21:29:52,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:52,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:29:52,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008159464] [2020-08-21 21:29:52,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:29:52,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:52,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:29:52,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:52,943 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 21:29:53,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:53,156 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 21:29:53,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:29:53,156 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 21:29:53,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:53,157 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:29:53,157 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 21:29:53,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:53,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 21:29:53,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 21:29:53,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:29:53,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 21:29:53,163 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 21:29:53,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:53,163 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 21:29:53,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:29:53,164 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 21:29:53,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:29:53,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:53,165 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:53,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:29:53,165 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:53,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:53,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 21:29:53,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:53,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512634049] [2020-08-21 21:29:53,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:53,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:53,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,423 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512634049] [2020-08-21 21:29:53,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:29:53,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840554052] [2020-08-21 21:29:53,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:29:53,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:29:53,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:53,425 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 21:29:53,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:53,594 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 21:29:53,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:29:53,595 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 21:29:53,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:53,596 INFO L225 Difference]: With dead ends: 31 [2020-08-21 21:29:53,596 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 21:29:53,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:53,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 21:29:53,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 21:29:53,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 21:29:53,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 21:29:53,604 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 21:29:53,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:53,606 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 21:29:53,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:29:53,606 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 21:29:53,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 21:29:53,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:53,609 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:53,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:29:53,610 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:53,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:53,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 21:29:53,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:53,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9348239] [2020-08-21 21:29:53,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:53,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:53,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:53,915 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:53,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9348239] [2020-08-21 21:29:53,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:53,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:29:53,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775373873] [2020-08-21 21:29:53,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:29:53,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:53,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:29:53,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:53,918 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 21:29:54,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,100 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 21:29:54,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:54,101 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 21:29:54,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,102 INFO L225 Difference]: With dead ends: 32 [2020-08-21 21:29:54,102 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 21:29:54,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:54,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 21:29:54,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 21:29:54,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 21:29:54,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 21:29:54,108 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 21:29:54,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,108 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 21:29:54,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:54,108 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 21:29:54,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:29:54,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,109 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:29:54,109 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,110 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 21:29:54,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961370269] [2020-08-21 21:29:54,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,398 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961370269] [2020-08-21 21:29:54,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:54,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640020607] [2020-08-21 21:29:54,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:54,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:54,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:54,401 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 21:29:54,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,574 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 21:29:54,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:54,574 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 21:29:54,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,575 INFO L225 Difference]: With dead ends: 33 [2020-08-21 21:29:54,575 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:29:54,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:54,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:29:54,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 21:29:54,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:29:54,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 21:29:54,585 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 21:29:54,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,586 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 21:29:54,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:54,586 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 21:29:54,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 21:29:54,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,588 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:54,588 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 21:29:54,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722182990] [2020-08-21 21:29:54,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,974 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722182990] [2020-08-21 21:29:54,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:54,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917147090] [2020-08-21 21:29:54,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:54,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:54,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:54,979 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 21:29:55,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,212 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 21:29:55,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:55,213 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 21:29:55,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,213 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:29:55,214 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 21:29:55,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:55,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 21:29:55,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 21:29:55,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:29:55,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 21:29:55,220 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 21:29:55,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,220 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 21:29:55,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:55,220 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 21:29:55,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:29:55,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,221 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:55,221 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,222 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 21:29:55,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985008977] [2020-08-21 21:29:55,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,580 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985008977] [2020-08-21 21:29:55,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:29:55,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373691521] [2020-08-21 21:29:55,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:29:55,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:29:55,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:55,584 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 21:29:55,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,821 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 21:29:55,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:29:55,822 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 21:29:55,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,823 INFO L225 Difference]: With dead ends: 35 [2020-08-21 21:29:55,823 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:29:55,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:55,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:29:55,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 21:29:55,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 21:29:55,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 21:29:55,829 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 21:29:55,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,830 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 21:29:55,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:29:55,830 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 21:29:55,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 21:29:55,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,831 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:29:55,831 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,832 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 21:29:55,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758540301] [2020-08-21 21:29:55,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758540301] [2020-08-21 21:29:56,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:29:56,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523691709] [2020-08-21 21:29:56,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:29:56,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:29:56,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:56,226 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 21:29:56,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,494 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 21:29:56,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:29:56,494 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 21:29:56,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,495 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:29:56,495 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:29:56,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:56,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:29:56,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 21:29:56,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:29:56,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 21:29:56,503 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 21:29:56,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,504 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 21:29:56,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:29:56,504 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 21:29:56,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:29:56,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,505 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:29:56,505 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,505 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 21:29:56,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695855080] [2020-08-21 21:29:56,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,954 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695855080] [2020-08-21 21:29:56,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:29:56,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181350027] [2020-08-21 21:29:56,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:29:56,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:29:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:56,956 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 21:29:57,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:57,280 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 21:29:57,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:29:57,280 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 21:29:57,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:57,281 INFO L225 Difference]: With dead ends: 37 [2020-08-21 21:29:57,281 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:29:57,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:57,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:29:57,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 21:29:57,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 21:29:57,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 21:29:57,289 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 21:29:57,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:57,289 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 21:29:57,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:29:57,290 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 21:29:57,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 21:29:57,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:57,290 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:57,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:29:57,291 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:57,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:57,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 21:29:57,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:57,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824831565] [2020-08-21 21:29:57,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:57,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,757 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824831565] [2020-08-21 21:29:57,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:29:57,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660141571] [2020-08-21 21:29:57,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:29:57,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:29:57,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:57,759 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 21:29:58,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,063 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 21:29:58,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:29:58,065 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 21:29:58,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,066 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:29:58,066 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 21:29:58,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:58,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 21:29:58,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 21:29:58,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:29:58,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 21:29:58,072 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 21:29:58,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,072 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 21:29:58,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:29:58,072 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 21:29:58,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:29:58,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,073 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:29:58,074 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,074 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 21:29:58,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912273567] [2020-08-21 21:29:58,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:58,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:58,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,532 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:58,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912273567] [2020-08-21 21:29:58,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:58,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:29:58,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888748361] [2020-08-21 21:29:58,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:29:58,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:58,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:29:58,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:58,551 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 21:29:58,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,900 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 21:29:58,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:29:58,901 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 21:29:58,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,902 INFO L225 Difference]: With dead ends: 39 [2020-08-21 21:29:58,902 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:29:58,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:58,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:29:58,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 21:29:58,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 21:29:58,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 21:29:58,907 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 21:29:58,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,908 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 21:29:58,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:29:58,908 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 21:29:58,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 21:29:58,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,909 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:29:58,909 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,910 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 21:29:58,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156776126] [2020-08-21 21:29:58,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:59,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,400 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:59,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156776126] [2020-08-21 21:29:59,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:59,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:29:59,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835457129] [2020-08-21 21:29:59,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:29:59,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:59,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:29:59,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:59,403 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 21:29:59,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:59,754 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 21:29:59,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:29:59,754 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 21:29:59,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:59,755 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:29:59,755 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 21:29:59,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:59,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 21:29:59,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 21:29:59,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:29:59,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 21:29:59,760 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 21:29:59,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:59,760 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 21:29:59,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:29:59,761 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 21:29:59,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:29:59,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:59,761 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:59,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:29:59,762 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:59,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:59,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 21:29:59,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:59,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784768337] [2020-08-21 21:29:59,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:59,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:00,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,298 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:00,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784768337] [2020-08-21 21:30:00,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:00,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:30:00,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183237780] [2020-08-21 21:30:00,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:30:00,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:00,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:30:00,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:00,301 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 21:30:00,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:00,618 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 21:30:00,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:30:00,618 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 21:30:00,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:00,619 INFO L225 Difference]: With dead ends: 41 [2020-08-21 21:30:00,619 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:30:00,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:00,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:30:00,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 21:30:00,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 21:30:00,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 21:30:00,626 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 21:30:00,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:00,627 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 21:30:00,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:30:00,627 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 21:30:00,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 21:30:00,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:00,628 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:00,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:30:00,628 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:00,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:00,628 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 21:30:00,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:00,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018867000] [2020-08-21 21:30:00,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:00,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:01,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:01,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018867000] [2020-08-21 21:30:01,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:01,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:30:01,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876677323] [2020-08-21 21:30:01,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:30:01,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:01,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:30:01,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:30:01,142 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 21:30:01,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:01,576 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 21:30:01,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:30:01,576 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 21:30:01,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:01,577 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:30:01,577 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 21:30:01,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:30:01,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 21:30:01,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 21:30:01,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:30:01,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 21:30:01,582 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 21:30:01,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:01,583 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 21:30:01,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:30:01,583 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 21:30:01,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:30:01,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:01,584 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:01,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:30:01,584 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:01,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:01,584 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 21:30:01,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:01,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684134453] [2020-08-21 21:30:01,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:01,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:02,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:02,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684134453] [2020-08-21 21:30:02,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:02,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:30:02,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872840615] [2020-08-21 21:30:02,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:30:02,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:02,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:30:02,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:02,226 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 21:30:02,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:02,706 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 21:30:02,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:30:02,706 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 21:30:02,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:02,707 INFO L225 Difference]: With dead ends: 43 [2020-08-21 21:30:02,707 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:30:02,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:02,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:30:02,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 21:30:02,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 21:30:02,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 21:30:02,724 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 21:30:02,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:02,724 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 21:30:02,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:30:02,724 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 21:30:02,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 21:30:02,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:02,728 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:02,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:30:02,729 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:02,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:02,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 21:30:02,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:02,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179856660] [2020-08-21 21:30:02,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:02,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:03,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,545 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:03,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179856660] [2020-08-21 21:30:03,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:03,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:30:03,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845108568] [2020-08-21 21:30:03,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:30:03,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:03,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:30:03,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:30:03,547 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 21:30:04,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:04,068 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 21:30:04,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:30:04,068 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 21:30:04,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:04,069 INFO L225 Difference]: With dead ends: 44 [2020-08-21 21:30:04,069 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 21:30:04,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:30:04,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 21:30:04,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 21:30:04,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:30:04,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 21:30:04,076 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 21:30:04,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:04,076 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 21:30:04,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:30:04,076 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 21:30:04,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:30:04,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:04,077 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:04,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:30:04,077 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:04,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:04,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 21:30:04,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:04,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012860538] [2020-08-21 21:30:04,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:04,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:04,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,835 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:04,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012860538] [2020-08-21 21:30:04,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:04,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:30:04,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964435945] [2020-08-21 21:30:04,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:30:04,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:04,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:30:04,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:04,836 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 21:30:05,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:05,383 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 21:30:05,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:30:05,383 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 21:30:05,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:05,384 INFO L225 Difference]: With dead ends: 45 [2020-08-21 21:30:05,384 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:30:05,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:05,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:30:05,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 21:30:05,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 21:30:05,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 21:30:05,390 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 21:30:05,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:05,390 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 21:30:05,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:30:05,391 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 21:30:05,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 21:30:05,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:05,391 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:05,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:30:05,391 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:05,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:05,392 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 21:30:05,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:05,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127489954] [2020-08-21 21:30:05,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:05,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:06,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:06,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:06,141 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:06,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127489954] [2020-08-21 21:30:06,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:06,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:30:06,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887118720] [2020-08-21 21:30:06,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:30:06,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:06,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:30:06,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:30:06,143 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 21:30:06,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:06,790 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 21:30:06,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:30:06,790 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 21:30:06,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:06,791 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:30:06,791 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 21:30:06,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:30:06,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 21:30:06,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 21:30:06,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:30:06,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 21:30:06,796 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 21:30:06,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:06,797 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 21:30:06,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:30:06,797 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 21:30:06,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:30:06,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:06,798 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:06,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:30:06,798 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:06,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:06,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 21:30:06,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:06,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823734899] [2020-08-21 21:30:06,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:06,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:07,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:07,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823734899] [2020-08-21 21:30:07,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:07,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:30:07,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157325753] [2020-08-21 21:30:07,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:30:07,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:07,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:30:07,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:07,607 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 21:30:08,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:08,245 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 21:30:08,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:30:08,247 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 21:30:08,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:08,247 INFO L225 Difference]: With dead ends: 47 [2020-08-21 21:30:08,247 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:30:08,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:08,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:30:08,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 21:30:08,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 21:30:08,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 21:30:08,252 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 21:30:08,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:08,253 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 21:30:08,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:30:08,253 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 21:30:08,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:30:08,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:08,253 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:08,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:30:08,254 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:08,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:08,254 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 21:30:08,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:08,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885546038] [2020-08-21 21:30:08,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:08,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:09,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,139 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:09,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885546038] [2020-08-21 21:30:09,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:09,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:30:09,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429642143] [2020-08-21 21:30:09,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:30:09,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:09,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:30:09,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:09,142 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 21:30:09,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:09,824 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 21:30:09,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:30:09,825 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 21:30:09,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:09,826 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:30:09,826 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:30:09,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:09,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:30:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 21:30:09,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:30:09,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 21:30:09,831 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 21:30:09,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:09,831 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 21:30:09,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:30:09,831 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 21:30:09,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:30:09,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:09,832 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:09,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:30:09,832 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:09,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:09,832 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 21:30:09,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:09,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695696907] [2020-08-21 21:30:09,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:09,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:10,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:10,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:10,668 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:10,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695696907] [2020-08-21 21:30:10,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:10,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:30:10,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936037502] [2020-08-21 21:30:10,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:30:10,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:10,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:30:10,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:10,670 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 21:30:11,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:11,407 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 21:30:11,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:30:11,408 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 21:30:11,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:11,409 INFO L225 Difference]: With dead ends: 49 [2020-08-21 21:30:11,409 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:30:11,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:11,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:30:11,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 21:30:11,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 21:30:11,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 21:30:11,414 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 21:30:11,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:11,415 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 21:30:11,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:30:11,415 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 21:30:11,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 21:30:11,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:11,415 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:11,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:30:11,416 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:11,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:11,416 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 21:30:11,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:11,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320136570] [2020-08-21 21:30:11,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:11,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:12,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,305 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:12,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320136570] [2020-08-21 21:30:12,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:12,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:30:12,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93263127] [2020-08-21 21:30:12,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:30:12,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:12,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:30:12,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:12,306 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 21:30:13,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:13,055 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 21:30:13,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:30:13,055 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 21:30:13,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:13,056 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:30:13,056 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 21:30:13,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:13,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 21:30:13,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 21:30:13,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:30:13,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 21:30:13,062 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 21:30:13,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:13,062 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 21:30:13,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:30:13,063 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 21:30:13,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:30:13,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:13,063 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:13,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:30:13,063 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:13,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:13,064 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 21:30:13,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:13,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396940360] [2020-08-21 21:30:13,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:13,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:14,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,058 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:14,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396940360] [2020-08-21 21:30:14,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:14,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:30:14,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935280972] [2020-08-21 21:30:14,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:30:14,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:14,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:30:14,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:14,060 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 21:30:14,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:14,867 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 21:30:14,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:30:14,867 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 21:30:14,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:14,868 INFO L225 Difference]: With dead ends: 51 [2020-08-21 21:30:14,868 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:30:14,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:14,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:30:14,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 21:30:14,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:30:14,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 21:30:14,873 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 21:30:14,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:14,873 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 21:30:14,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:30:14,874 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 21:30:14,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 21:30:14,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:14,874 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:14,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:30:14,875 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:14,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:14,875 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 21:30:14,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:14,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244292892] [2020-08-21 21:30:14,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:14,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,830 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 21:30:15,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244292892] [2020-08-21 21:30:15,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:15,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:30:15,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652905659] [2020-08-21 21:30:15,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:30:15,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:30:15,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:15,832 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 21:30:16,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,669 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 21:30:16,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:30:16,669 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 21:30:16,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,670 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:30:16,670 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 21:30:16,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:16,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 21:30:16,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 21:30:16,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 21:30:16,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 21:30:16,675 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 21:30:16,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,676 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 21:30:16,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:30:16,676 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 21:30:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:30:16,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,677 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:30:16,677 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,677 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 21:30:16,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [388345623] [2020-08-21 21:30:16,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:17,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,653 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:17,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [388345623] [2020-08-21 21:30:17,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:17,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:30:17,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498920244] [2020-08-21 21:30:17,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:30:17,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:17,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:30:17,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:17,655 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 21:30:18,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:18,549 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 21:30:18,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:30:18,550 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 21:30:18,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:18,551 INFO L225 Difference]: With dead ends: 53 [2020-08-21 21:30:18,551 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 21:30:18,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:18,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 21:30:18,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 21:30:18,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 21:30:18,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 21:30:18,555 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 21:30:18,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:18,556 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 21:30:18,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:30:18,556 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 21:30:18,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 21:30:18,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:18,556 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:18,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:30:18,557 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:18,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:18,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 21:30:18,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:18,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452674972] [2020-08-21 21:30:18,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:18,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452674972] [2020-08-21 21:30:19,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:19,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:30:19,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390234806] [2020-08-21 21:30:19,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:30:19,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:30:19,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:19,714 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 21:30:20,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,650 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 21:30:20,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:30:20,651 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 21:30:20,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,652 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:30:20,652 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:30:20,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:20,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:30:20,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:30:20,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:30:20,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 21:30:20,657 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 21:30:20,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,657 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 21:30:20,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:30:20,657 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 21:30:20,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:30:20,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,658 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:30:20,658 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,659 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 21:30:20,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126338613] [2020-08-21 21:30:20,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,904 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:21,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126338613] [2020-08-21 21:30:21,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:30:21,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502682536] [2020-08-21 21:30:21,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:30:21,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:30:21,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:21,907 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 21:30:22,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:22,927 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 21:30:22,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:30:22,928 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 21:30:22,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:22,929 INFO L225 Difference]: With dead ends: 55 [2020-08-21 21:30:22,929 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 21:30:22,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:22,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 21:30:22,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 21:30:22,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 21:30:22,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 21:30:22,933 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 21:30:22,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:22,933 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 21:30:22,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:30:22,933 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 21:30:22,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 21:30:22,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:22,934 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:22,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:30:22,934 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:22,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:22,934 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 21:30:22,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:22,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110141070] [2020-08-21 21:30:22,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:22,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:24,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,195 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:24,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110141070] [2020-08-21 21:30:24,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:24,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:30:24,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895537027] [2020-08-21 21:30:24,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:30:24,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:24,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:30:24,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:24,197 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 21:30:25,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:25,255 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 21:30:25,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:30:25,258 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 21:30:25,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:25,258 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:30:25,259 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 21:30:25,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:25,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 21:30:25,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 21:30:25,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:30:25,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 21:30:25,263 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 21:30:25,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:25,264 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 21:30:25,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:30:25,264 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 21:30:25,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:30:25,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:25,265 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:25,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:30:25,265 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:25,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:25,265 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 21:30:25,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:25,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482140315] [2020-08-21 21:30:25,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:25,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:26,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,567 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:26,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482140315] [2020-08-21 21:30:26,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:26,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:30:26,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160141480] [2020-08-21 21:30:26,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:30:26,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:26,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:30:26,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:26,570 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 21:30:27,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:27,691 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 21:30:27,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:30:27,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 21:30:27,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:27,693 INFO L225 Difference]: With dead ends: 57 [2020-08-21 21:30:27,693 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:30:27,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:27,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:30:27,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 21:30:27,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 21:30:27,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 21:30:27,701 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 21:30:27,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:27,701 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 21:30:27,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:30:27,701 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 21:30:27,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 21:30:27,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:27,702 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:27,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:30:27,702 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:27,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:27,702 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 21:30:27,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:27,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958437368] [2020-08-21 21:30:27,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:29,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,077 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:29,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958437368] [2020-08-21 21:30:29,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:29,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 21:30:29,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6471912] [2020-08-21 21:30:29,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 21:30:29,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:29,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 21:30:29,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:29,080 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 21:30:30,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:30,236 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 21:30:30,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 21:30:30,236 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 21:30:30,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:30,237 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:30:30,237 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 21:30:30,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:30,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 21:30:30,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 21:30:30,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:30:30,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 21:30:30,242 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 21:30:30,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:30,242 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 21:30:30,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 21:30:30,243 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 21:30:30,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:30:30,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:30,243 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:30,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 21:30:30,244 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:30,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:30,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 21:30:30,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:30,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318224270] [2020-08-21 21:30:30,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:30,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:31,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,824 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:31,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318224270] [2020-08-21 21:30:31,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:31,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 21:30:31,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676032621] [2020-08-21 21:30:31,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 21:30:31,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:31,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 21:30:31,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:31,826 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 21:30:33,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:33,022 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 21:30:33,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 21:30:33,024 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 21:30:33,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:33,025 INFO L225 Difference]: With dead ends: 59 [2020-08-21 21:30:33,025 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:30:33,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:33,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:30:33,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 21:30:33,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 21:30:33,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 21:30:33,030 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 21:30:33,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:33,030 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 21:30:33,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 21:30:33,030 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 21:30:33,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 21:30:33,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:33,031 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:33,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 21:30:33,031 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:33,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:33,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 21:30:33,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:33,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1028501101] [2020-08-21 21:30:33,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:33,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:34,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,741 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:34,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1028501101] [2020-08-21 21:30:34,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:34,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 21:30:34,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841346124] [2020-08-21 21:30:34,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 21:30:34,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:34,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 21:30:34,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:30:34,745 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 21:30:36,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:36,008 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 21:30:36,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 21:30:36,009 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 21:30:36,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:36,010 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:30:36,010 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 21:30:36,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:30:36,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 21:30:36,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 21:30:36,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:30:36,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 21:30:36,014 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 21:30:36,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:36,014 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 21:30:36,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 21:30:36,015 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 21:30:36,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:30:36,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:36,015 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:36,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 21:30:36,015 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:36,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:36,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 21:30:36,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:36,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142839223] [2020-08-21 21:30:36,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:36,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:37,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,581 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:37,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142839223] [2020-08-21 21:30:37,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:37,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 21:30:37,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220849504] [2020-08-21 21:30:37,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 21:30:37,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:37,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 21:30:37,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:37,583 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 21:30:38,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:38,952 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 21:30:38,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 21:30:38,953 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 21:30:38,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:38,953 INFO L225 Difference]: With dead ends: 61 [2020-08-21 21:30:38,953 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:30:38,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:38,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:30:38,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 21:30:38,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 21:30:38,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 21:30:38,957 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 21:30:38,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:38,958 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 21:30:38,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 21:30:38,958 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 21:30:38,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 21:30:38,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:38,958 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:38,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 21:30:38,959 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:38,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:38,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 21:30:38,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:38,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103833622] [2020-08-21 21:30:38,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:38,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:40,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:40,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:40,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:40,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103833622] [2020-08-21 21:30:40,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:40,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 21:30:40,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475535197] [2020-08-21 21:30:40,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 21:30:40,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:40,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 21:30:40,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:40,581 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 21:30:41,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:41,960 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 21:30:41,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 21:30:41,961 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 21:30:41,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:41,962 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:30:41,962 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 21:30:41,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:41,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 21:30:41,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 21:30:41,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:30:41,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 21:30:41,968 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 21:30:41,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:41,968 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 21:30:41,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 21:30:41,968 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 21:30:41,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:30:41,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:41,969 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:41,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 21:30:41,969 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:41,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:41,969 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 21:30:41,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:41,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396762181] [2020-08-21 21:30:41,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:41,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:43,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:43,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:43,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:43,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396762181] [2020-08-21 21:30:43,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:43,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 21:30:43,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897785174] [2020-08-21 21:30:43,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 21:30:43,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:43,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 21:30:43,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:43,697 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 21:30:45,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:45,159 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 21:30:45,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 21:30:45,160 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 21:30:45,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:45,161 INFO L225 Difference]: With dead ends: 63 [2020-08-21 21:30:45,161 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:30:45,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:45,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:30:45,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 21:30:45,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 21:30:45,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 21:30:45,166 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 21:30:45,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:45,166 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 21:30:45,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 21:30:45,166 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 21:30:45,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 21:30:45,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:45,167 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:45,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 21:30:45,167 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:45,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:45,168 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 21:30:45,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:45,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304657628] [2020-08-21 21:30:45,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:45,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:46,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:46,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:46,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:46,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304657628] [2020-08-21 21:30:46,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:46,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 21:30:46,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455784550] [2020-08-21 21:30:46,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 21:30:46,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:46,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 21:30:46,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 21:30:46,871 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.