/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:54:13,088 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 02:54:13,124 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:54:13,125 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:54:13,126 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:54:13,127 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:54:13,128 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:54:13,128 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:54:13,130 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:54:13,132 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:54:13,133 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:54:13,134 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:54:13,135 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:54:13,136 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:54:13,139 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:54:13,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:54:13,147 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:54:13,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:54:13,148 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 02:54:13,174 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:54:13,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:54:13,175 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:54:13,175 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:54:13,175 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:54:13,176 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:54:13,176 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:54:13,176 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:54:13,176 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:54:13,177 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:54:13,178 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:54:13,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:54:13,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:54:13,178 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:54:13,178 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:54:13,179 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:54:13,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:54:13,179 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:54:13,179 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:54:13,180 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:54:13,180 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:54:13,180 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:54:13,180 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:54:13,180 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:54:13,181 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; [2020-08-19 02:54:13,461 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:54:13,480 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:54:13,485 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:54:13,486 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:54:13,488 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:54:13,489 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 02:54:13,564 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6bb1de7dc/d8ef6ae7153e47a5a551492738314599/FLAGedd37632d [2020-08-19 02:54:14,060 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:54:14,060 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 02:54:14,068 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6bb1de7dc/d8ef6ae7153e47a5a551492738314599/FLAGedd37632d [2020-08-19 02:54:14,420 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6bb1de7dc/d8ef6ae7153e47a5a551492738314599 [2020-08-19 02:54:14,431 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:54:14,433 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:54:14,434 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:54:14,434 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:54:14,437 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:54:14,438 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,441 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40e8030c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14, skipping insertion in model container [2020-08-19 02:54:14,441 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,449 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:54:14,467 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:54:14,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:54:14,662 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:54:14,677 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:54:14,689 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:54:14,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14 WrapperNode [2020-08-19 02:54:14,690 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:54:14,691 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:54:14,691 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:54:14,691 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:54:14,702 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,702 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,785 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,785 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,789 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,795 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... [2020-08-19 02:54:14,797 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:54:14,797 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:54:14,797 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:54:14,797 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:54:14,798 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:54:14,859 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:54:14,860 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:54:14,860 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 02:54:14,860 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:54:14,860 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:54:14,860 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:54:14,860 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:54:14,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:54:15,039 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:54:15,039 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 02:54:15,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:54:15 BoogieIcfgContainer [2020-08-19 02:54:15,043 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:54:15,044 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:54:15,044 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:54:15,047 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:54:15,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:54:14" (1/3) ... [2020-08-19 02:54:15,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a7429d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:54:15, skipping insertion in model container [2020-08-19 02:54:15,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:54:14" (2/3) ... [2020-08-19 02:54:15,049 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a7429d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:54:15, skipping insertion in model container [2020-08-19 02:54:15,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:54:15" (3/3) ... [2020-08-19 02:54:15,051 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-19 02:54:15,061 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:54:15,068 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:54:15,082 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:54:15,104 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:54:15,104 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:54:15,104 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:54:15,105 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:54:15,105 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:54:15,105 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:54:15,105 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:54:15,105 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:54:15,124 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 02:54:15,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:54:15,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,131 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,131 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-19 02:54:15,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453646166] [2020-08-19 02:54:15,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453646166] [2020-08-19 02:54:15,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:54:15,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 02:54:15,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311342404] [2020-08-19 02:54:15,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 02:54:15,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 02:54:15,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 02:54:15,293 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-19 02:54:15,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,319 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-19 02:54:15,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 02:54:15,320 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 02:54:15,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,329 INFO L225 Difference]: With dead ends: 37 [2020-08-19 02:54:15,329 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:54:15,333 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 [2020-08-19 02:54:15,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:54:15,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 02:54:15,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 02:54:15,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-19 02:54:15,373 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-19 02:54:15,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,373 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-19 02:54:15,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 02:54:15,374 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-19 02:54:15,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:54:15,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,375 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:54:15,376 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-19 02:54:15,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142681834] [2020-08-19 02:54:15,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142681834] [2020-08-19 02:54:15,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:54:15,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:54:15,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133408565] [2020-08-19 02:54:15,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:54:15,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:54:15,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:54:15,432 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-19 02:54:15,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,458 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-19 02:54:15,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:54:15,460 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 02:54:15,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,461 INFO L225 Difference]: With dead ends: 20 [2020-08-19 02:54:15,462 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:54:15,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:54:15,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:54:15,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:54:15,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:54:15,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 02:54:15,477 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-19 02:54:15,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,478 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 02:54:15,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:54:15,478 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 02:54:15,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:54:15,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,491 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:54:15,492 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-19 02:54:15,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020362674] [2020-08-19 02:54:15,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020362674] [2020-08-19 02:54:15,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:54:15,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:54:15,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330079493] [2020-08-19 02:54:15,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:54:15,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:54:15,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:54:15,555 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 02:54:15,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,572 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-19 02:54:15,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:54:15,573 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-19 02:54:15,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,574 INFO L225 Difference]: With dead ends: 25 [2020-08-19 02:54:15,574 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:54:15,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:54:15,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:54:15,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 02:54:15,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 02:54:15,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 02:54:15,580 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-19 02:54:15,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,581 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 02:54:15,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:54:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 02:54:15,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 02:54:15,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:54:15,583 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,583 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-19 02:54:15,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368456211] [2020-08-19 02:54:15,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368456211] [2020-08-19 02:54:15,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:15,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:54:15,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337396723] [2020-08-19 02:54:15,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:54:15,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:54:15,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:54:15,656 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-19 02:54:15,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,730 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-19 02:54:15,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:54:15,730 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-19 02:54:15,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,731 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:54:15,731 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:54:15,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:54:15,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:54:15,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:54:15,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:54:15,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 02:54:15,738 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-19 02:54:15,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,739 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 02:54:15,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:54:15,739 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 02:54:15,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:54:15,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,740 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:54:15,741 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,741 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-19 02:54:15,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477679618] [2020-08-19 02:54:15,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477679618] [2020-08-19 02:54:15,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:15,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:54:15,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615060090] [2020-08-19 02:54:15,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:54:15,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:54:15,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:54:15,825 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-19 02:54:15,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,908 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 02:54:15,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:54:15,909 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 02:54:15,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,910 INFO L225 Difference]: With dead ends: 27 [2020-08-19 02:54:15,910 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 02:54:15,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:54:15,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 02:54:15,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 02:54:15,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 02:54:15,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 02:54:15,917 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-19 02:54:15,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,917 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 02:54:15,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:54:15,917 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 02:54:15,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 02:54:15,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,918 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:54:15,919 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,919 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-19 02:54:15,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340644380] [2020-08-19 02:54:15,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:15,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:15,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:15,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340644380] [2020-08-19 02:54:15,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:15,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:54:15,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048857704] [2020-08-19 02:54:15,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:54:15,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:15,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:54:15,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:54:15,989 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-19 02:54:16,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,088 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-19 02:54:16,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:54:16,089 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-19 02:54:16,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,090 INFO L225 Difference]: With dead ends: 28 [2020-08-19 02:54:16,090 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 02:54:16,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:54:16,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 02:54:16,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 02:54:16,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 02:54:16,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-19 02:54:16,098 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-19 02:54:16,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,098 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-19 02:54:16,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:54:16,099 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-19 02:54:16,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:54:16,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,100 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:54:16,100 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-19 02:54:16,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219148639] [2020-08-19 02:54:16,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,228 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:16,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219148639] [2020-08-19 02:54:16,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:54:16,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129765182] [2020-08-19 02:54:16,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:54:16,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:54:16,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:54:16,231 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-19 02:54:16,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,351 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 02:54:16,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:54:16,352 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-19 02:54:16,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,353 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:54:16,353 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:54:16,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:54:16,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:54:16,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 02:54:16,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:54:16,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 02:54:16,359 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-19 02:54:16,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,360 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 02:54:16,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:54:16,360 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 02:54:16,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 02:54:16,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,361 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:54:16,361 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-19 02:54:16,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248366647] [2020-08-19 02:54:16,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,444 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:16,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248366647] [2020-08-19 02:54:16,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:54:16,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023713880] [2020-08-19 02:54:16,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:54:16,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:54:16,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:54:16,447 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-19 02:54:16,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,591 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 02:54:16,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:54:16,592 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 02:54:16,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,593 INFO L225 Difference]: With dead ends: 30 [2020-08-19 02:54:16,593 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 02:54:16,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:54:16,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 02:54:16,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 02:54:16,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:54:16,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-19 02:54:16,599 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-19 02:54:16,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,600 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-19 02:54:16,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:54:16,600 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-19 02:54:16,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:54:16,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,601 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:54:16,601 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,602 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-19 02:54:16,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861536774] [2020-08-19 02:54:16,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,634 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:16,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861536774] [2020-08-19 02:54:16,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 02:54:16,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276904918] [2020-08-19 02:54:16,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:54:16,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:54:16,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:54:16,636 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-19 02:54:16,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,656 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-19 02:54:16,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:54:16,657 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 02:54:16,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,657 INFO L225 Difference]: With dead ends: 30 [2020-08-19 02:54:16,658 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 02:54:16,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:54:16,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 02:54:16,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 02:54:16,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:54:16,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-19 02:54:16,664 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-19 02:54:16,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,664 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-19 02:54:16,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:54:16,665 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-19 02:54:16,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:54:16,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,666 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:54:16,666 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,666 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-19 02:54:16,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657053382] [2020-08-19 02:54:16,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,706 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:16,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657053382] [2020-08-19 02:54:16,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:54:16,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720461622] [2020-08-19 02:54:16,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:54:16,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:54:16,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:54:16,709 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-19 02:54:16,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,727 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-19 02:54:16,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:54:16,728 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-19 02:54:16,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,729 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:54:16,729 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:54:16,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:54:16,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:54:16,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 02:54:16,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:54:16,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-19 02:54:16,735 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-19 02:54:16,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,735 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-19 02:54:16,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:54:16,736 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-19 02:54:16,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:54:16,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,737 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:54:16,737 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-19 02:54:16,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142717562] [2020-08-19 02:54:16,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,796 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:16,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142717562] [2020-08-19 02:54:16,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:54:16,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580124232] [2020-08-19 02:54:16,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:54:16,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:54:16,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:54:16,799 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-19 02:54:16,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:16,828 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-19 02:54:16,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:54:16,830 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-19 02:54:16,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:16,831 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:54:16,831 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 02:54:16,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:54:16,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 02:54:16,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 02:54:16,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:54:16,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 02:54:16,842 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-19 02:54:16,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:16,842 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 02:54:16,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:54:16,842 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 02:54:16,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:54:16,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:16,843 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:16,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:54:16,844 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:16,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:16,845 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-19 02:54:16,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:16,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691097305] [2020-08-19 02:54:16,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:16,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,960 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:16,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691097305] [2020-08-19 02:54:16,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:54:16,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396892091] [2020-08-19 02:54:16,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:54:16,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:54:16,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:54:16,963 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-19 02:54:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:17,155 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-19 02:54:17,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:54:17,156 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-19 02:54:17,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:17,157 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:54:17,157 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:54:17,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:54:17,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:54:17,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 02:54:17,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 02:54:17,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 02:54:17,165 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-19 02:54:17,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:17,166 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 02:54:17,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:54:17,166 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 02:54:17,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 02:54:17,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:17,167 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:17,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:54:17,168 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:17,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:17,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-19 02:54:17,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:17,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148936879] [2020-08-19 02:54:17,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:17,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:17,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,279 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:17,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148936879] [2020-08-19 02:54:17,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:17,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:54:17,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007390758] [2020-08-19 02:54:17,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:54:17,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:17,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:54:17,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:54:17,281 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-19 02:54:17,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:17,477 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-19 02:54:17,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:54:17,478 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-19 02:54:17,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:17,478 INFO L225 Difference]: With dead ends: 55 [2020-08-19 02:54:17,479 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 02:54:17,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:54:17,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 02:54:17,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 02:54:17,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:54:17,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-19 02:54:17,485 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-19 02:54:17,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:17,486 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-19 02:54:17,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:54:17,486 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-19 02:54:17,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:54:17,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:17,487 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:17,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:54:17,487 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:17,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:17,488 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-19 02:54:17,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:17,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196705849] [2020-08-19 02:54:17,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:17,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:17,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,589 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:17,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196705849] [2020-08-19 02:54:17,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:17,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:54:17,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553535997] [2020-08-19 02:54:17,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:54:17,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:17,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:54:17,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:54:17,591 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-19 02:54:17,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:17,832 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-19 02:54:17,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:54:17,832 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 02:54:17,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:17,833 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:54:17,834 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:54:17,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:54:17,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:54:17,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 02:54:17,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 02:54:17,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-19 02:54:17,844 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-19 02:54:17,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:17,844 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-19 02:54:17,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:54:17,845 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-19 02:54:17,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 02:54:17,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:17,846 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:17,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:54:17,846 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:17,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:17,846 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-19 02:54:17,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:17,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438544374] [2020-08-19 02:54:17,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:17,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:17,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:17,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438544374] [2020-08-19 02:54:17,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:17,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:54:17,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214858791] [2020-08-19 02:54:17,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:54:17,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:17,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:54:17,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:54:17,985 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-19 02:54:18,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:18,297 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-19 02:54:18,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:54:18,298 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-19 02:54:18,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:18,298 INFO L225 Difference]: With dead ends: 57 [2020-08-19 02:54:18,298 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 02:54:18,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:54:18,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 02:54:18,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 02:54:18,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:54:18,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-19 02:54:18,305 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-19 02:54:18,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:18,306 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-19 02:54:18,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:54:18,306 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-19 02:54:18,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:54:18,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:18,307 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:18,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:54:18,307 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:18,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:18,307 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-19 02:54:18,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:18,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918343553] [2020-08-19 02:54:18,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:18,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:18,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:18,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:18,457 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:18,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918343553] [2020-08-19 02:54:18,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:18,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:54:18,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088220374] [2020-08-19 02:54:18,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:54:18,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:18,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:54:18,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:54:18,462 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-19 02:54:18,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:18,820 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-19 02:54:18,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:54:18,820 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 02:54:18,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:18,821 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:54:18,821 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:54:18,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:54:18,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:54:18,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 02:54:18,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 02:54:18,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-19 02:54:18,835 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-19 02:54:18,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:18,835 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-19 02:54:18,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:54:18,836 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-19 02:54:18,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 02:54:18,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:18,837 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:18,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:54:18,837 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:18,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:18,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-19 02:54:18,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:18,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454603940] [2020-08-19 02:54:18,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:18,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:19,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,024 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:19,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454603940] [2020-08-19 02:54:19,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:19,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:54:19,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331360937] [2020-08-19 02:54:19,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:54:19,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:19,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:54:19,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:54:19,026 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-19 02:54:19,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:19,381 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-19 02:54:19,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:54:19,382 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 02:54:19,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:19,383 INFO L225 Difference]: With dead ends: 59 [2020-08-19 02:54:19,383 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 02:54:19,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:54:19,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 02:54:19,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 02:54:19,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:54:19,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-19 02:54:19,389 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-19 02:54:19,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:19,390 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-19 02:54:19,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:54:19,390 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-19 02:54:19,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:54:19,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:19,391 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:19,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:54:19,391 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:19,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:19,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-19 02:54:19,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:19,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518583884] [2020-08-19 02:54:19,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:19,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:19,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:19,564 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:19,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518583884] [2020-08-19 02:54:19,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:19,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:54:19,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407803558] [2020-08-19 02:54:19,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:54:19,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:19,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:54:19,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:54:19,566 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-19 02:54:20,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:20,010 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-19 02:54:20,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:54:20,011 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 02:54:20,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:20,012 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:54:20,012 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:54:20,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:54:20,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:54:20,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 02:54:20,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 02:54:20,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-19 02:54:20,019 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-19 02:54:20,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:20,019 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-19 02:54:20,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:54:20,019 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-19 02:54:20,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 02:54:20,020 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:20,020 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:20,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:54:20,021 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:20,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:20,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-19 02:54:20,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:20,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995683882] [2020-08-19 02:54:20,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:20,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:20,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,219 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:20,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995683882] [2020-08-19 02:54:20,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:20,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:54:20,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844440365] [2020-08-19 02:54:20,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:54:20,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:20,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:54:20,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:54:20,221 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-19 02:54:20,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:20,715 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-19 02:54:20,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:54:20,715 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-19 02:54:20,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:20,716 INFO L225 Difference]: With dead ends: 61 [2020-08-19 02:54:20,716 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:54:20,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:54:20,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:54:20,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 02:54:20,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:54:20,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-19 02:54:20,725 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-19 02:54:20,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:20,725 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-19 02:54:20,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:54:20,725 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-19 02:54:20,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:54:20,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:20,726 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:20,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:54:20,726 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:20,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:20,727 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-19 02:54:20,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:20,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031803207] [2020-08-19 02:54:20,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:20,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:20,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,941 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:20,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031803207] [2020-08-19 02:54:20,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:20,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:54:20,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136466508] [2020-08-19 02:54:20,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:54:20,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:20,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:54:20,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:54:20,942 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-19 02:54:21,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:21,464 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-19 02:54:21,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:54:21,470 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 02:54:21,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:21,471 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:54:21,471 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:54:21,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:54:21,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:54:21,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 02:54:21,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 02:54:21,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-19 02:54:21,478 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-19 02:54:21,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:21,479 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-19 02:54:21,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:54:21,479 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-19 02:54:21,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:54:21,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:21,480 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:21,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:54:21,480 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:21,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:21,480 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-19 02:54:21,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:21,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687521090] [2020-08-19 02:54:21,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:21,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:21,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:21,717 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:21,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687521090] [2020-08-19 02:54:21,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:21,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:54:21,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385668469] [2020-08-19 02:54:21,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:54:21,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:21,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:54:21,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:54:21,718 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-19 02:54:22,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:22,350 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 02:54:22,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:54:22,351 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-19 02:54:22,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:22,352 INFO L225 Difference]: With dead ends: 63 [2020-08-19 02:54:22,352 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 02:54:22,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:54:22,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 02:54:22,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 02:54:22,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:54:22,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-19 02:54:22,359 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-19 02:54:22,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:22,359 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-19 02:54:22,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:54:22,360 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-19 02:54:22,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 02:54:22,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:22,360 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:22,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:54:22,361 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:22,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:22,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-19 02:54:22,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:22,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244217404] [2020-08-19 02:54:22,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:22,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:22,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,625 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:22,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244217404] [2020-08-19 02:54:22,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:22,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:54:22,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755842125] [2020-08-19 02:54:22,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:54:22,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:22,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:54:22,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:54:22,627 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-19 02:54:23,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:23,317 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-19 02:54:23,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:54:23,320 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-19 02:54:23,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:23,321 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:54:23,321 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:54:23,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:54:23,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:54:23,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 02:54:23,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 02:54:23,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-19 02:54:23,329 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-19 02:54:23,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:23,330 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-19 02:54:23,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:54:23,330 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-19 02:54:23,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 02:54:23,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:23,331 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:23,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:54:23,331 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:23,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:23,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-19 02:54:23,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:23,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303144913] [2020-08-19 02:54:23,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:23,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:23,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:23,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:23,641 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:23,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303144913] [2020-08-19 02:54:23,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:23,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:54:23,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699041684] [2020-08-19 02:54:23,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:54:23,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:23,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:54:23,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:54:23,643 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-19 02:54:24,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:24,439 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-19 02:54:24,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:54:24,440 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-19 02:54:24,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:24,441 INFO L225 Difference]: With dead ends: 65 [2020-08-19 02:54:24,441 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 02:54:24,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:54:24,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 02:54:24,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 02:54:24,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:54:24,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-19 02:54:24,450 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-19 02:54:24,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:24,451 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-19 02:54:24,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:54:24,451 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-19 02:54:24,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:54:24,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:24,452 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:24,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:54:24,452 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:24,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:24,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-19 02:54:24,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:24,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521918747] [2020-08-19 02:54:24,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:24,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:24,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,753 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:24,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521918747] [2020-08-19 02:54:24,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:24,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:54:24,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949919827] [2020-08-19 02:54:24,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:54:24,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:24,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:54:24,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:54:24,757 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-19 02:54:25,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:25,586 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 02:54:25,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:54:25,587 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-19 02:54:25,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:25,587 INFO L225 Difference]: With dead ends: 66 [2020-08-19 02:54:25,587 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:54:25,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:54:25,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:54:25,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 02:54:25,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:54:25,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-19 02:54:25,594 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-19 02:54:25,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:25,594 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-19 02:54:25,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:54:25,594 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-19 02:54:25,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 02:54:25,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:25,594 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:25,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:54:25,595 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:25,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:25,595 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-19 02:54:25,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:25,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451754569] [2020-08-19 02:54:25,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:25,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:25,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:25,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:25,935 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:25,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451754569] [2020-08-19 02:54:25,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:25,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:54:25,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288063568] [2020-08-19 02:54:25,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:54:25,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:25,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:54:25,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:54:25,937 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-19 02:54:26,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:26,884 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-19 02:54:26,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:54:26,889 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-19 02:54:26,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:26,890 INFO L225 Difference]: With dead ends: 67 [2020-08-19 02:54:26,890 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 02:54:26,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:54:26,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 02:54:26,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 02:54:26,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 02:54:26,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-19 02:54:26,898 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-19 02:54:26,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:26,899 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-19 02:54:26,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:54:26,899 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-19 02:54:26,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:54:26,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:26,900 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:26,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:54:26,900 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:26,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:26,900 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-19 02:54:26,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:26,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616375577] [2020-08-19 02:54:26,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:26,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:27,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,273 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:27,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616375577] [2020-08-19 02:54:27,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:27,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:54:27,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759920645] [2020-08-19 02:54:27,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:54:27,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:27,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:54:27,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:54:27,275 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-19 02:54:28,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:28,333 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-19 02:54:28,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:54:28,335 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-19 02:54:28,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:28,336 INFO L225 Difference]: With dead ends: 68 [2020-08-19 02:54:28,336 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 02:54:28,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:54:28,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 02:54:28,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 02:54:28,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 02:54:28,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-19 02:54:28,344 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-19 02:54:28,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:28,345 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-19 02:54:28,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:54:28,345 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-19 02:54:28,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 02:54:28,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:28,345 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:28,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:54:28,346 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:28,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:28,346 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-19 02:54:28,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:28,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870511117] [2020-08-19 02:54:28,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:28,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:28,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:28,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:28,775 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 02:54:28,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870511117] [2020-08-19 02:54:28,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:28,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:54:28,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017683288] [2020-08-19 02:54:28,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:54:28,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:28,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:54:28,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:54:28,778 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-19 02:54:29,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:29,932 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-19 02:54:29,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:54:29,932 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-19 02:54:29,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:29,933 INFO L225 Difference]: With dead ends: 69 [2020-08-19 02:54:29,934 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:54:29,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:54:29,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:54:29,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 02:54:29,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:54:29,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-19 02:54:29,943 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-19 02:54:29,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:29,943 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-19 02:54:29,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:54:29,943 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-19 02:54:29,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:54:29,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:29,944 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:29,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:54:29,945 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:29,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:29,945 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-19 02:54:29,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:29,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610854144] [2020-08-19 02:54:29,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:29,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:29,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:29,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:30,002 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-19 02:54:30,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610854144] [2020-08-19 02:54:30,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:54:30,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:54:30,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349656115] [2020-08-19 02:54:30,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:54:30,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:30,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:54:30,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:54:30,004 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-19 02:54:30,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:30,029 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 02:54:30,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:54:30,029 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-19 02:54:30,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:30,030 INFO L225 Difference]: With dead ends: 66 [2020-08-19 02:54:30,030 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 02:54:30,030 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 [2020-08-19 02:54:30,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 02:54:30,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 02:54:30,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 02:54:30,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 02:54:30,031 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-19 02:54:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:30,032 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 02:54:30,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:54:30,032 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 02:54:30,032 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 02:54:30,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:54:30,035 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 02:54:30,250 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 02:54:30,250 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 02:54:30,250 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-19 02:54:30,250 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-19 02:54:30,251 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-19 02:54:30,251 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-19 02:54:30,251 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-19 02:54:30,251 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-19 02:54:30,251 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-19 02:54:30,251 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 02:54:30,252 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-19 02:54:30,253 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-19 02:54:30,253 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-19 02:54:30,253 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 02:54:30,254 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-19 02:54:30,254 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-19 02:54:30,254 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-19 02:54:30,254 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-19 02:54:30,254 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-19 02:54:30,254 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-19 02:54:30,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 02:54:30 BoogieIcfgContainer [2020-08-19 02:54:30,271 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 02:54:30,274 INFO L168 Benchmark]: Toolchain (without parser) took 15840.98 ms. Allocated memory was 139.5 MB in the beginning and 369.1 MB in the end (delta: 229.6 MB). Free memory was 102.5 MB in the beginning and 299.6 MB in the end (delta: -197.1 MB). Peak memory consumption was 238.8 MB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,274 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,275 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.99 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 92.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,276 INFO L168 Benchmark]: Boogie Preprocessor took 105.80 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 92.4 MB in the beginning and 180.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,276 INFO L168 Benchmark]: RCFGBuilder took 245.92 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 169.0 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,277 INFO L168 Benchmark]: TraceAbstraction took 15227.23 ms. Allocated memory was 202.4 MB in the beginning and 369.1 MB in the end (delta: 166.7 MB). Free memory was 168.4 MB in the beginning and 299.6 MB in the end (delta: -131.3 MB). Peak memory consumption was 241.7 MB. Max. memory is 7.1 GB. [2020-08-19 02:54:30,280 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 256.99 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 92.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.80 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 92.4 MB in the beginning and 180.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 245.92 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 169.0 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15227.23 ms. Allocated memory was 202.4 MB in the beginning and 369.1 MB in the end (delta: 166.7 MB). Free memory was 168.4 MB in the beginning and 299.6 MB in the end (delta: -131.3 MB). Peak memory consumption was 241.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 14.9s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.9s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...