/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 18:49:29,146 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 18:49:29,180 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:49:29,181 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:49:29,182 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:49:29,183 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:49:29,184 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:49:29,185 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:49:29,187 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:49:29,189 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:49:29,190 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:49:29,191 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:49:29,192 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:49:29,193 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:49:29,196 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:49:29,202 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:49:29,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:49:29,204 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:49:29,205 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 18:49:29,226 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:49:29,227 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:49:29,228 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:49:29,228 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:49:29,228 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:49:29,229 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:49:29,229 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:49:29,229 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:49:29,229 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:49:29,229 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:49:29,230 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:49:29,230 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:49:29,230 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:49:29,230 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:49:29,230 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:49:29,231 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:49:29,231 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:49:29,231 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:49:29,231 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:49:29,231 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:49:29,231 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:49:29,232 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:49:29,232 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:49:29,232 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:49:29,232 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:49:29,232 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:49:29,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:49:29,233 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:49:29,233 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:49:29,233 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:49:29,564 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:49:29,578 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:49:29,581 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:49:29,583 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:49:29,584 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:49:29,584 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 18:49:29,657 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/447457b52/461da83532384671ba9c123f3f3fa995/FLAG9490fb846 [2020-08-18 18:49:30,121 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:49:30,122 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 18:49:30,128 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/447457b52/461da83532384671ba9c123f3f3fa995/FLAG9490fb846 [2020-08-18 18:49:30,529 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/447457b52/461da83532384671ba9c123f3f3fa995 [2020-08-18 18:49:30,543 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:49:30,545 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:49:30,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:30,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:49:30,551 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:49:30,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fbadd11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30, skipping insertion in model container [2020-08-18 18:49:30,557 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,566 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:49:30,587 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:49:30,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:30,830 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:49:30,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:30,866 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:49:30,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30 WrapperNode [2020-08-18 18:49:30,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:30,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:49:30,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:49:30,868 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:49:30,877 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,960 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,967 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,973 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... [2020-08-18 18:49:30,974 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:49:30,975 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:49:30,975 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:49:30,975 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:49:30,976 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:49:31,036 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:49:31,036 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:49:31,036 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 18:49:31,036 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:49:31,037 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:49:31,037 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:49:31,037 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 18:49:31,038 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 18:49:31,038 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:49:31,039 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 18:49:31,040 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:49:31,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:49:31,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:49:31,211 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:49:31,212 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 18:49:31,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:31 BoogieIcfgContainer [2020-08-18 18:49:31,216 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:49:31,217 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:49:31,217 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:49:31,220 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:49:31,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:49:30" (1/3) ... [2020-08-18 18:49:31,221 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56856649 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:31, skipping insertion in model container [2020-08-18 18:49:31,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:30" (2/3) ... [2020-08-18 18:49:31,222 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56856649 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:31, skipping insertion in model container [2020-08-18 18:49:31,222 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:31" (3/3) ... [2020-08-18 18:49:31,224 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 18:49:31,235 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:49:31,246 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:49:31,260 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:49:31,284 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:49:31,285 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:49:31,285 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:49:31,285 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:49:31,285 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:49:31,285 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:49:31,285 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:49:31,286 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:49:31,304 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 18:49:31,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:49:31,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:31,311 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:31,311 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:31,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:31,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 18:49:31,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:31,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379703437] [2020-08-18 18:49:31,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:31,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:31,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:31,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379703437] [2020-08-18 18:49:31,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:31,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 18:49:31,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715461307] [2020-08-18 18:49:31,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 18:49:31,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:31,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 18:49:31,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 18:49:31,450 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 18:49:31,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:31,473 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 18:49:31,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 18:49:31,475 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 18:49:31,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:31,483 INFO L225 Difference]: With dead ends: 32 [2020-08-18 18:49:31,483 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 18:49:31,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 18:49:31,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 18:49:31,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 18:49:31,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 18:49:31,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 18:49:31,526 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 18:49:31,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:31,527 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 18:49:31,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 18:49:31,527 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 18:49:31,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:49:31,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:31,528 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:31,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:49:31,529 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:31,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:31,529 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 18:49:31,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:31,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868311962] [2020-08-18 18:49:31,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:31,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:31,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:31,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868311962] [2020-08-18 18:49:31,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:31,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 18:49:31,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615397188] [2020-08-18 18:49:31,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:31,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:31,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:31,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:31,652 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 18:49:31,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:31,698 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 18:49:31,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:31,700 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 18:49:31,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:31,701 INFO L225 Difference]: With dead ends: 21 [2020-08-18 18:49:31,701 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:49:31,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:31,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:49:31,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:49:31,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:49:31,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 18:49:31,711 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 18:49:31,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:31,712 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 18:49:31,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:31,712 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 18:49:31,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:49:31,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:31,713 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:31,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:49:31,714 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:31,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:31,715 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 18:49:31,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:31,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508828775] [2020-08-18 18:49:31,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:31,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:31,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:31,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508828775] [2020-08-18 18:49:31,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:31,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:49:31,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943807631] [2020-08-18 18:49:31,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:49:31,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:31,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:49:31,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:31,868 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 18:49:31,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:31,936 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 18:49:31,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:49:31,937 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 18:49:31,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:31,938 INFO L225 Difference]: With dead ends: 24 [2020-08-18 18:49:31,938 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 18:49:31,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:31,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 18:49:31,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 18:49:31,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 18:49:31,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 18:49:31,948 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 18:49:31,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:31,949 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 18:49:31,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:49:31,949 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 18:49:31,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:49:31,950 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:31,950 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:31,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:49:31,951 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:31,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:31,951 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 18:49:31,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:31,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994297455] [2020-08-18 18:49:31,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:31,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:32,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,088 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:32,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994297455] [2020-08-18 18:49:32,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:32,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:49:32,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190392619] [2020-08-18 18:49:32,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:49:32,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:32,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:49:32,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:32,091 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 18:49:32,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:32,172 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 18:49:32,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:49:32,173 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 18:49:32,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:32,174 INFO L225 Difference]: With dead ends: 27 [2020-08-18 18:49:32,174 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 18:49:32,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:32,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 18:49:32,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 18:49:32,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:49:32,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 18:49:32,182 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 18:49:32,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:32,183 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 18:49:32,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:49:32,183 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 18:49:32,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:49:32,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:32,184 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:32,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:49:32,185 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:32,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:32,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 18:49:32,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:32,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072613656] [2020-08-18 18:49:32,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:32,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:32,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,384 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:32,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072613656] [2020-08-18 18:49:32,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:32,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:49:32,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224950398] [2020-08-18 18:49:32,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:49:32,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:32,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:49:32,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:32,388 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 18:49:32,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:32,473 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 18:49:32,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:49:32,474 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 18:49:32,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:32,475 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:49:32,475 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:49:32,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:32,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:49:32,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 18:49:32,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:49:32,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 18:49:32,484 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 18:49:32,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:32,484 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 18:49:32,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:49:32,498 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 18:49:32,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:49:32,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:32,501 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:32,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:49:32,501 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:32,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:32,502 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 18:49:32,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:32,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663532440] [2020-08-18 18:49:32,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:32,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:32,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,689 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:32,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663532440] [2020-08-18 18:49:32,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:32,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:49:32,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81493607] [2020-08-18 18:49:32,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:49:32,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:32,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:49:32,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:49:32,692 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 18:49:32,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:32,785 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 18:49:32,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:49:32,785 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 18:49:32,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:32,786 INFO L225 Difference]: With dead ends: 33 [2020-08-18 18:49:32,786 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 18:49:32,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:32,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 18:49:32,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 18:49:32,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:49:32,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 18:49:32,794 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 18:49:32,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:32,794 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 18:49:32,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:49:32,795 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 18:49:32,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:49:32,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:32,796 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:32,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:49:32,796 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:32,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:32,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 18:49:32,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:32,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116922088] [2020-08-18 18:49:32,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:32,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:32,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:32,913 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:32,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116922088] [2020-08-18 18:49:32,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:32,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:49:32,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873714733] [2020-08-18 18:49:32,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:49:32,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:32,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:49:32,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:49:32,916 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 18:49:33,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:33,010 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 18:49:33,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:49:33,011 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 18:49:33,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:33,012 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:49:33,012 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:49:33,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:49:33,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:49:33,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 18:49:33,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 18:49:33,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 18:49:33,019 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 18:49:33,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:33,020 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 18:49:33,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:49:33,020 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 18:49:33,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 18:49:33,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:33,021 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:33,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:49:33,022 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:33,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:33,022 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 18:49:33,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:33,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580263911] [2020-08-18 18:49:33,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:33,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:33,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,143 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:33,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580263911] [2020-08-18 18:49:33,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:33,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:49:33,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99324363] [2020-08-18 18:49:33,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:49:33,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:33,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:49:33,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:49:33,146 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 18:49:33,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:33,276 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 18:49:33,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:49:33,276 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 18:49:33,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:33,277 INFO L225 Difference]: With dead ends: 39 [2020-08-18 18:49:33,278 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:49:33,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:49:33,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:49:33,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 18:49:33,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:49:33,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 18:49:33,296 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 18:49:33,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:33,300 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 18:49:33,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:49:33,300 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 18:49:33,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:49:33,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:33,302 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:33,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:49:33,302 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:33,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:33,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 18:49:33,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:33,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781963361] [2020-08-18 18:49:33,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:33,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:33,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,506 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:33,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781963361] [2020-08-18 18:49:33,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:33,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:49:33,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959166191] [2020-08-18 18:49:33,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:49:33,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:33,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:49:33,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:49:33,512 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 18:49:33,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:33,688 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 18:49:33,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:49:33,689 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 18:49:33,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:33,690 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:49:33,690 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:49:33,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:49:33,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:49:33,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 18:49:33,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:49:33,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 18:49:33,700 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 18:49:33,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:33,700 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 18:49:33,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:49:33,701 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 18:49:33,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:49:33,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:33,702 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:33,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:49:33,702 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:33,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:33,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 18:49:33,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:33,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603678446] [2020-08-18 18:49:33,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:33,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:33,856 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:33,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603678446] [2020-08-18 18:49:33,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:33,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:49:33,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912758342] [2020-08-18 18:49:33,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:49:33,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:33,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:49:33,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:49:33,859 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 18:49:34,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:34,029 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 18:49:34,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:49:34,029 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 18:49:34,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:34,030 INFO L225 Difference]: With dead ends: 45 [2020-08-18 18:49:34,031 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 18:49:34,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:49:34,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 18:49:34,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 18:49:34,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:49:34,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 18:49:34,038 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 18:49:34,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:34,039 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 18:49:34,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:49:34,039 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 18:49:34,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:49:34,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:34,041 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:34,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:49:34,041 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:34,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:34,041 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 18:49:34,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:34,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897009675] [2020-08-18 18:49:34,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:34,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:34,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,240 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:34,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897009675] [2020-08-18 18:49:34,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:34,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:49:34,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009980395] [2020-08-18 18:49:34,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:49:34,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:34,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:49:34,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:49:34,244 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 18:49:34,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:34,439 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 18:49:34,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:49:34,440 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 18:49:34,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:34,441 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:49:34,441 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:49:34,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:49:34,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:49:34,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:49:34,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:49:34,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 18:49:34,451 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 18:49:34,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:34,451 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 18:49:34,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:49:34,452 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 18:49:34,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:49:34,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:34,458 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:34,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:49:34,458 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:34,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:34,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 18:49:34,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:34,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553234111] [2020-08-18 18:49:34,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:34,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:34,697 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:34,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553234111] [2020-08-18 18:49:34,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:34,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:49:34,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183500180] [2020-08-18 18:49:34,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:49:34,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:34,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:49:34,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:49:34,700 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 18:49:34,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:34,916 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 18:49:34,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:49:34,916 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 18:49:34,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:34,917 INFO L225 Difference]: With dead ends: 51 [2020-08-18 18:49:34,918 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 18:49:34,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:49:34,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 18:49:34,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 18:49:34,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:49:34,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 18:49:34,929 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 18:49:34,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:34,929 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 18:49:34,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:49:34,929 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 18:49:34,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:49:34,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:34,931 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:34,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:49:34,931 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:34,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:34,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 18:49:34,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:34,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613806817] [2020-08-18 18:49:34,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:34,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:35,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,155 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:35,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613806817] [2020-08-18 18:49:35,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:35,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:49:35,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883922750] [2020-08-18 18:49:35,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:49:35,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:35,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:49:35,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:49:35,159 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 18:49:35,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:35,468 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 18:49:35,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:49:35,468 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 18:49:35,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:35,469 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:49:35,469 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:49:35,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:35,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:49:35,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 18:49:35,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 18:49:35,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 18:49:35,488 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 18:49:35,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:35,488 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 18:49:35,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:49:35,489 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 18:49:35,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:49:35,492 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:35,492 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:35,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:49:35,493 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:35,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:35,493 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 18:49:35,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:35,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549222154] [2020-08-18 18:49:35,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:35,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:35,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:35,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549222154] [2020-08-18 18:49:35,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:35,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:49:35,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691817270] [2020-08-18 18:49:35,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:49:35,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:35,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:49:35,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:49:35,745 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 18:49:36,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,002 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 18:49:36,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:49:36,003 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 18:49:36,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,003 INFO L225 Difference]: With dead ends: 57 [2020-08-18 18:49:36,004 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 18:49:36,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:49:36,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 18:49:36,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 18:49:36,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:49:36,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 18:49:36,012 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 18:49:36,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,012 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 18:49:36,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:49:36,012 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 18:49:36,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:49:36,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,013 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:49:36,014 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 18:49:36,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565304883] [2020-08-18 18:49:36,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:36,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565304883] [2020-08-18 18:49:36,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:49:36,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626967804] [2020-08-18 18:49:36,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:49:36,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:49:36,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:49:36,250 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 18:49:36,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:36,561 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 18:49:36,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:49:36,562 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 18:49:36,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:36,562 INFO L225 Difference]: With dead ends: 60 [2020-08-18 18:49:36,563 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:49:36,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:49:36,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:49:36,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 18:49:36,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 18:49:36,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 18:49:36,578 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 18:49:36,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:36,579 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 18:49:36,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:49:36,579 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 18:49:36,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 18:49:36,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:36,580 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:36,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:49:36,581 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:36,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:36,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 18:49:36,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:36,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306467260] [2020-08-18 18:49:36,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:36,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:36,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:36,862 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:36,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306467260] [2020-08-18 18:49:36,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:36,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:49:36,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392909060] [2020-08-18 18:49:36,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:49:36,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:36,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:49:36,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:49:36,866 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 18:49:37,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,199 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 18:49:37,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:49:37,202 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 18:49:37,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,203 INFO L225 Difference]: With dead ends: 63 [2020-08-18 18:49:37,203 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 18:49:37,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:49:37,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 18:49:37,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 18:49:37,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:49:37,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 18:49:37,218 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 18:49:37,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,219 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 18:49:37,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:49:37,219 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 18:49:37,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:49:37,220 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,220 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:49:37,221 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,221 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 18:49:37,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642164480] [2020-08-18 18:49:37,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:37,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:37,496 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:37,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642164480] [2020-08-18 18:49:37,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:37,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:49:37,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815074123] [2020-08-18 18:49:37,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:49:37,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:37,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:49:37,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:49:37,498 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 18:49:37,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:37,902 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 18:49:37,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:49:37,903 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 18:49:37,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:37,904 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:49:37,904 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 18:49:37,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:49:37,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 18:49:37,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 18:49:37,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 18:49:37,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 18:49:37,920 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 18:49:37,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:37,921 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 18:49:37,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:49:37,921 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 18:49:37,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 18:49:37,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:37,922 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:37,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:49:37,923 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:37,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:37,923 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 18:49:37,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:37,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956443806] [2020-08-18 18:49:37,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:37,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,234 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:38,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956443806] [2020-08-18 18:49:38,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:49:38,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391350373] [2020-08-18 18:49:38,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:49:38,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:49:38,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:49:38,236 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 18:49:38,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:38,616 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 18:49:38,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:49:38,616 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 18:49:38,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:38,617 INFO L225 Difference]: With dead ends: 69 [2020-08-18 18:49:38,618 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 18:49:38,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:49:38,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 18:49:38,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 18:49:38,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 18:49:38,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 18:49:38,626 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 18:49:38,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:38,627 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 18:49:38,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:49:38,627 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 18:49:38,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 18:49:38,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:38,628 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:38,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:49:38,628 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:38,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:38,629 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 18:49:38,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:38,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741365303] [2020-08-18 18:49:38,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:38,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:38,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:38,992 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:38,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741365303] [2020-08-18 18:49:38,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:38,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:49:38,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478927318] [2020-08-18 18:49:38,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:49:38,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:38,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:49:38,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:49:38,995 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 18:49:39,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:39,425 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 18:49:39,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:49:39,425 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 18:49:39,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:39,426 INFO L225 Difference]: With dead ends: 72 [2020-08-18 18:49:39,426 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 18:49:39,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:49:39,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 18:49:39,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 18:49:39,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 18:49:39,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 18:49:39,435 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 18:49:39,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:39,436 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 18:49:39,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:49:39,436 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 18:49:39,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 18:49:39,436 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:39,437 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:39,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:49:39,437 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:39,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:39,437 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 18:49:39,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:39,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568488525] [2020-08-18 18:49:39,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:39,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:39,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:39,786 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:39,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568488525] [2020-08-18 18:49:39,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:39,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:49:39,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172363043] [2020-08-18 18:49:39,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:49:39,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:39,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:49:39,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:49:39,788 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 18:49:40,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:40,316 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 18:49:40,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:49:40,316 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 18:49:40,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:40,317 INFO L225 Difference]: With dead ends: 75 [2020-08-18 18:49:40,318 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 18:49:40,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:49:40,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 18:49:40,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 18:49:40,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 18:49:40,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 18:49:40,329 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 18:49:40,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:40,329 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 18:49:40,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:49:40,329 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 18:49:40,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 18:49:40,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:40,330 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:40,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:49:40,331 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:40,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:40,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 18:49:40,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:40,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739602938] [2020-08-18 18:49:40,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:40,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:40,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:40,711 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:40,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739602938] [2020-08-18 18:49:40,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:40,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:49:40,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100313843] [2020-08-18 18:49:40,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:49:40,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:40,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:49:40,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:49:40,713 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 18:49:41,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:41,321 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 18:49:41,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:49:41,321 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 18:49:41,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:41,322 INFO L225 Difference]: With dead ends: 78 [2020-08-18 18:49:41,323 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 18:49:41,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:49:41,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 18:49:41,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 18:49:41,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 18:49:41,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 18:49:41,333 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 18:49:41,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:41,333 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 18:49:41,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:49:41,333 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 18:49:41,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 18:49:41,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:41,334 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:41,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:49:41,335 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:41,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:41,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 18:49:41,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:41,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944995993] [2020-08-18 18:49:41,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:41,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:41,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:41,768 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:41,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944995993] [2020-08-18 18:49:41,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:41,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:49:41,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469637924] [2020-08-18 18:49:41,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:49:41,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:41,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:49:41,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:49:41,770 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 18:49:42,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:42,385 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 18:49:42,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:49:42,387 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 18:49:42,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:42,388 INFO L225 Difference]: With dead ends: 81 [2020-08-18 18:49:42,389 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 18:49:42,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:49:42,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 18:49:42,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 18:49:42,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 18:49:42,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 18:49:42,396 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 18:49:42,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:42,397 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 18:49:42,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:49:42,397 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 18:49:42,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 18:49:42,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:42,398 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:42,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:49:42,398 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:42,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:42,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 18:49:42,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:42,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521501042] [2020-08-18 18:49:42,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:42,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:42,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:42,908 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:42,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521501042] [2020-08-18 18:49:42,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:42,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:49:42,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955358212] [2020-08-18 18:49:42,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:49:42,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:42,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:49:42,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:49:42,911 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 18:49:43,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:43,575 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 18:49:43,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:49:43,576 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 18:49:43,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:43,577 INFO L225 Difference]: With dead ends: 84 [2020-08-18 18:49:43,577 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 18:49:43,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:43,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 18:49:43,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 18:49:43,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 18:49:43,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 18:49:43,584 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 18:49:43,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:43,585 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 18:49:43,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:49:43,585 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 18:49:43,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 18:49:43,586 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:43,586 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:43,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:49:43,586 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:43,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:43,586 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 18:49:43,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:43,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613239475] [2020-08-18 18:49:43,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:43,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:44,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:44,095 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:44,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613239475] [2020-08-18 18:49:44,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:44,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:49:44,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143173776] [2020-08-18 18:49:44,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:49:44,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:44,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:49:44,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:49:44,098 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 18:49:44,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:44,837 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 18:49:44,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:49:44,837 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 18:49:44,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:44,838 INFO L225 Difference]: With dead ends: 87 [2020-08-18 18:49:44,839 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 18:49:44,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:44,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 18:49:44,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 18:49:44,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 18:49:44,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 18:49:44,847 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 18:49:44,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:44,847 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 18:49:44,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:49:44,847 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 18:49:44,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 18:49:44,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:44,848 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:44,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:49:44,849 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:44,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:44,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 18:49:44,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:44,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594813545] [2020-08-18 18:49:44,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:44,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:45,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:45,414 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:45,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594813545] [2020-08-18 18:49:45,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:45,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:49:45,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202799428] [2020-08-18 18:49:45,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:49:45,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:45,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:49:45,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:49:45,417 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 18:49:46,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:46,246 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 18:49:46,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:49:46,246 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 18:49:46,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:46,247 INFO L225 Difference]: With dead ends: 90 [2020-08-18 18:49:46,247 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 18:49:46,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:46,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 18:49:46,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 18:49:46,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 18:49:46,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 18:49:46,254 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 18:49:46,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:46,254 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 18:49:46,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:49:46,254 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 18:49:46,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 18:49:46,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:46,255 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:46,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:49:46,256 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:46,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:46,256 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 18:49:46,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:46,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876232462] [2020-08-18 18:49:46,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:46,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:46,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:46,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:46,944 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:46,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876232462] [2020-08-18 18:49:46,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:46,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:49:46,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516099579] [2020-08-18 18:49:46,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:49:46,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:46,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:49:46,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:49:46,950 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 18:49:47,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:47,958 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 18:49:47,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:49:47,959 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 18:49:47,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:47,960 INFO L225 Difference]: With dead ends: 93 [2020-08-18 18:49:47,960 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 18:49:47,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:47,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 18:49:47,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 18:49:47,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 18:49:47,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 18:49:47,968 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 18:49:47,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:47,968 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 18:49:47,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:49:47,969 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 18:49:47,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 18:49:47,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:47,970 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:47,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:49:47,970 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:47,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:47,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 18:49:47,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:47,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794300015] [2020-08-18 18:49:47,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:47,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:48,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:48,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:48,633 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:48,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794300015] [2020-08-18 18:49:48,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:48,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:49:48,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261487033] [2020-08-18 18:49:48,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:49:48,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:48,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:49:48,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:49:48,637 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 18:49:49,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:49,617 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 18:49:49,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:49:49,618 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 18:49:49,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:49,620 INFO L225 Difference]: With dead ends: 96 [2020-08-18 18:49:49,620 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 18:49:49,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:49,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 18:49:49,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 18:49:49,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 18:49:49,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 18:49:49,628 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 18:49:49,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:49,628 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 18:49:49,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:49:49,629 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 18:49:49,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 18:49:49,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:49,630 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:49,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:49:49,630 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:49,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:49,630 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 18:49:49,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:49,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922491724] [2020-08-18 18:49:49,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:49,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:50,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:50,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:50,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:50,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922491724] [2020-08-18 18:49:50,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:50,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:49:50,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965092438] [2020-08-18 18:49:50,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:49:50,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:50,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:49:50,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:49:50,233 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 18:49:51,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:51,284 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 18:49:51,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:49:51,285 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 18:49:51,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:51,286 INFO L225 Difference]: With dead ends: 99 [2020-08-18 18:49:51,286 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 18:49:51,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:51,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 18:49:51,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 18:49:51,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 18:49:51,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 18:49:51,295 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 18:49:51,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:51,296 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 18:49:51,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:49:51,296 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 18:49:51,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 18:49:51,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:51,297 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:51,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:49:51,297 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:51,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:51,298 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 18:49:51,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:51,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161458194] [2020-08-18 18:49:51,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:51,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:51,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:51,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:51,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:51,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161458194] [2020-08-18 18:49:51,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:51,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:49:51,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490248648] [2020-08-18 18:49:51,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:49:51,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:51,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:49:51,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:49:51,985 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 18:49:53,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:53,047 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 18:49:53,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:49:53,048 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 18:49:53,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:53,049 INFO L225 Difference]: With dead ends: 102 [2020-08-18 18:49:53,049 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 18:49:53,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:53,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 18:49:53,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 18:49:53,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 18:49:53,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 18:49:53,058 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 18:49:53,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:53,059 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 18:49:53,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:49:53,059 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 18:49:53,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 18:49:53,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:53,060 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:53,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:49:53,060 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:53,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:53,060 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 18:49:53,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:53,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751128474] [2020-08-18 18:49:53,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:53,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:53,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:53,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:53,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:53,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751128474] [2020-08-18 18:49:53,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:53,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:49:53,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321525036] [2020-08-18 18:49:53,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:49:53,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:53,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:49:53,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:49:53,779 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 18:49:54,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:54,935 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 18:49:54,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:49:54,936 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 18:49:54,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:54,937 INFO L225 Difference]: With dead ends: 105 [2020-08-18 18:49:54,937 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 18:49:54,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:54,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 18:49:54,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 18:49:54,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 18:49:54,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 18:49:54,946 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 18:49:54,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:54,947 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 18:49:54,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:49:54,947 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 18:49:54,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 18:49:54,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:54,948 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:54,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:49:54,948 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:54,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:54,949 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 18:49:54,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:54,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052872739] [2020-08-18 18:49:54,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:54,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:55,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:55,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:55,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052872739] [2020-08-18 18:49:55,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:55,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:49:55,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154976341] [2020-08-18 18:49:55,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:49:55,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:55,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:49:55,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:49:55,728 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 18:49:57,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:57,016 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 18:49:57,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:49:57,016 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 18:49:57,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:57,018 INFO L225 Difference]: With dead ends: 108 [2020-08-18 18:49:57,018 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 18:49:57,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:57,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 18:49:57,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 18:49:57,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 18:49:57,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 18:49:57,034 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 18:49:57,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:57,034 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 18:49:57,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:49:57,035 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 18:49:57,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 18:49:57,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:57,035 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:57,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:49:57,038 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:57,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:57,038 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 18:49:57,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:57,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611502838] [2020-08-18 18:49:57,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:57,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:57,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:57,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:57,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:57,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611502838] [2020-08-18 18:49:57,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:57,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:49:57,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897429042] [2020-08-18 18:49:57,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:49:57,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:57,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:49:57,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:49:57,842 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 18:49:59,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:59,193 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 18:49:59,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:49:59,196 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 18:49:59,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:59,197 INFO L225 Difference]: With dead ends: 111 [2020-08-18 18:49:59,197 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 18:49:59,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:49:59,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 18:49:59,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 18:49:59,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 18:49:59,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 18:49:59,208 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 18:49:59,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:59,209 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 18:49:59,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:49:59,209 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 18:49:59,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 18:49:59,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:59,210 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:59,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:49:59,210 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:59,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:59,211 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 18:49:59,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:59,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340044850] [2020-08-18 18:49:59,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:59,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:00,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:00,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:00,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340044850] [2020-08-18 18:50:00,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:00,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:50:00,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573883979] [2020-08-18 18:50:00,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:50:00,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:00,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:50:00,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:50:00,081 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 18:50:01,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:01,493 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 18:50:01,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:50:01,493 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 18:50:01,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:01,495 INFO L225 Difference]: With dead ends: 114 [2020-08-18 18:50:01,495 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 18:50:01,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:50:01,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 18:50:01,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 18:50:01,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 18:50:01,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 18:50:01,505 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 18:50:01,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:01,505 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 18:50:01,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:50:01,506 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 18:50:01,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 18:50:01,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:01,506 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:01,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:50:01,507 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:01,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:01,507 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 18:50:01,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:01,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813928784] [2020-08-18 18:50:01,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:01,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:02,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:02,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:02,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:02,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813928784] [2020-08-18 18:50:02,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:02,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:50:02,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136717058] [2020-08-18 18:50:02,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:50:02,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:02,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:50:02,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:50:02,473 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 18:50:04,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:04,044 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 18:50:04,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:50:04,044 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 18:50:04,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:04,046 INFO L225 Difference]: With dead ends: 117 [2020-08-18 18:50:04,046 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 18:50:04,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:50:04,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 18:50:04,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 18:50:04,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 18:50:04,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 18:50:04,057 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 18:50:04,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:04,058 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 18:50:04,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:50:04,058 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 18:50:04,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 18:50:04,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:04,059 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:04,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:50:04,059 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:04,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:04,060 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 18:50:04,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:04,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541359375] [2020-08-18 18:50:04,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:04,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:05,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:05,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:05,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:05,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541359375] [2020-08-18 18:50:05,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:05,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:50:05,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704208972] [2020-08-18 18:50:05,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:50:05,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:05,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:50:05,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:50:05,041 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 18:50:06,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:06,769 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 18:50:06,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:50:06,770 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 18:50:06,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:06,771 INFO L225 Difference]: With dead ends: 120 [2020-08-18 18:50:06,771 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 18:50:06,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:50:06,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 18:50:06,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 18:50:06,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 18:50:06,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 18:50:06,781 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 18:50:06,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:06,781 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 18:50:06,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:50:06,781 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 18:50:06,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 18:50:06,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:06,782 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:06,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:50:06,782 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:06,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:06,783 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 18:50:06,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:06,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655563351] [2020-08-18 18:50:06,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:06,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:07,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:07,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:07,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:07,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655563351] [2020-08-18 18:50:07,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:07,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:50:07,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897300847] [2020-08-18 18:50:07,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:50:07,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:07,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:50:07,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:50:07,828 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 18:50:09,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:09,627 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 18:50:09,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:50:09,628 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 18:50:09,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:09,630 INFO L225 Difference]: With dead ends: 123 [2020-08-18 18:50:09,630 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 18:50:09,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:50:09,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 18:50:09,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 18:50:09,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 18:50:09,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 18:50:09,640 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 18:50:09,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:09,640 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 18:50:09,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:50:09,640 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 18:50:09,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 18:50:09,641 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:09,641 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:09,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:50:09,641 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:09,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:09,641 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 18:50:09,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:09,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [599276343] [2020-08-18 18:50:09,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:09,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:10,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:10,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:10,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:10,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [599276343] [2020-08-18 18:50:10,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:10,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:50:10,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906633330] [2020-08-18 18:50:10,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:50:10,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:10,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:50:10,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:50:10,725 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 18:50:12,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:12,616 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 18:50:12,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:50:12,616 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 18:50:12,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:12,618 INFO L225 Difference]: With dead ends: 126 [2020-08-18 18:50:12,618 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 18:50:12,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:50:12,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 18:50:12,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 18:50:12,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 18:50:12,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 18:50:12,632 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 18:50:12,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:12,633 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 18:50:12,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:50:12,633 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 18:50:12,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 18:50:12,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:12,634 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:12,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:50:12,634 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:12,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:12,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 18:50:12,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:12,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561697656] [2020-08-18 18:50:12,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:12,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:13,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:13,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:13,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:13,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561697656] [2020-08-18 18:50:13,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:13,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:50:13,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909938152] [2020-08-18 18:50:13,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:50:13,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:13,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:50:13,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:50:13,803 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 18:50:15,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:15,755 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 18:50:15,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:50:15,756 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 18:50:15,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:15,758 INFO L225 Difference]: With dead ends: 129 [2020-08-18 18:50:15,758 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 18:50:15,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:50:15,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 18:50:15,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 18:50:15,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 18:50:15,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 18:50:15,769 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 18:50:15,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:15,769 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 18:50:15,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:50:15,770 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 18:50:15,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 18:50:15,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:15,771 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:15,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:50:15,771 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:15,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:15,771 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 18:50:15,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:15,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539723728] [2020-08-18 18:50:15,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:15,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:17,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:17,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:17,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:17,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539723728] [2020-08-18 18:50:17,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:17,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:50:17,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380133471] [2020-08-18 18:50:17,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:50:17,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:17,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:50:17,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:50:17,040 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 18:50:19,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:19,109 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 18:50:19,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:50:19,109 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 18:50:19,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:19,111 INFO L225 Difference]: With dead ends: 132 [2020-08-18 18:50:19,111 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 18:50:19,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:50:19,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 18:50:19,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 18:50:19,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 18:50:19,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 18:50:19,124 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 18:50:19,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:19,124 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 18:50:19,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 18:50:19,124 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 18:50:19,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 18:50:19,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:19,125 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:19,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:50:19,126 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:19,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:19,126 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 18:50:19,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:19,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182358690] [2020-08-18 18:50:19,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:19,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:20,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:20,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:20,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:20,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182358690] [2020-08-18 18:50:20,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:20,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 18:50:20,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351867903] [2020-08-18 18:50:20,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 18:50:20,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:20,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 18:50:20,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:50:20,500 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 18:50:22,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:22,734 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 18:50:22,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 18:50:22,735 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 18:50:22,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:22,736 INFO L225 Difference]: With dead ends: 135 [2020-08-18 18:50:22,736 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 18:50:22,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:50:22,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 18:50:22,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 18:50:22,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 18:50:22,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 18:50:22,750 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 18:50:22,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:22,750 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 18:50:22,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 18:50:22,750 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 18:50:22,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 18:50:22,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:22,751 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:22,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:50:22,752 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:22,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:22,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 18:50:22,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:22,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748431292] [2020-08-18 18:50:22,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:22,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:24,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:24,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:24,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:24,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748431292] [2020-08-18 18:50:24,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:24,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 18:50:24,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900604383] [2020-08-18 18:50:24,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 18:50:24,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:24,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 18:50:24,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:50:24,151 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-18 18:50:26,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:50:26,455 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-18 18:50:26,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 18:50:26,456 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-18 18:50:26,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:50:26,458 INFO L225 Difference]: With dead ends: 138 [2020-08-18 18:50:26,458 INFO L226 Difference]: Without dead ends: 133 [2020-08-18 18:50:26,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:50:26,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-18 18:50:26,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-18 18:50:26,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 18:50:26,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-18 18:50:26,472 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-18 18:50:26,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:50:26,472 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-18 18:50:26,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 18:50:26,473 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-18 18:50:26,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 18:50:26,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:50:26,474 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:50:26,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:50:26,474 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:50:26,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:50:26,474 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-18 18:50:26,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:50:26,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302586839] [2020-08-18 18:50:26,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:50:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:27,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:50:27,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:50:27,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:50:27,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302586839] [2020-08-18 18:50:27,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:50:27,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 18:50:27,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611688651] [2020-08-18 18:50:27,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 18:50:27,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:50:27,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 18:50:27,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:50:27,969 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.