/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=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:53:04,079 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:53:04,082 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:53:04,106 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 17:53:04,116 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:53:04,117 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:53:04,118 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:53:04,119 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:53:04,120 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:53:04,121 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:53:04,122 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:53:04,124 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:53:04,126 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:53:04,127 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:53:04,128 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:53:04,129 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:53:04,132 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:53:04,142 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:53:04,143 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:53:04,144 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:53:04,150 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 17:53:04,177 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:53:04,177 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:53:04,178 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:53:04,178 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:53:04,179 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:53:04,179 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:53:04,179 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:53:04,179 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:53:04,179 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:53:04,180 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:53:04,180 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:53:04,180 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:53:04,180 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:53:04,180 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:53:04,181 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:53:04,181 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:53:04,181 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:53:04,181 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:53:04,181 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:53:04,182 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:53:04,182 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:53:04,182 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:53:04,182 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:53:04,182 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:53:04,183 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:53:04,183 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:53:04,183 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:53:04,183 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:53:04,183 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:53:04,184 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 17:53:04,513 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:53:04,534 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:53:04,537 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:53:04,539 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:53:04,540 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:53:04,541 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-08-18 17:53:04,601 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ad7112a0/9095041d5a81403ab736e50827209a65/FLAG131710b8a [2020-08-18 17:53:05,054 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:53:05,055 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-08-18 17:53:05,062 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ad7112a0/9095041d5a81403ab736e50827209a65/FLAG131710b8a [2020-08-18 17:53:05,437 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ad7112a0/9095041d5a81403ab736e50827209a65 [2020-08-18 17:53:05,447 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:53:05,448 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:53:05,449 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:53:05,450 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:53:05,453 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:53:05,454 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,457 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@156a129e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05, skipping insertion in model container [2020-08-18 17:53:05,457 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,465 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:53:05,482 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:53:05,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:53:05,677 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:53:05,692 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:53:05,705 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:53:05,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05 WrapperNode [2020-08-18 17:53:05,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:53:05,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:53:05,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:53:05,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:53:05,717 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,722 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,723 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,726 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,729 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... [2020-08-18 17:53:05,731 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:53:05,731 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:53:05,731 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:53:05,731 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:53:05,732 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:53:05,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:53:05,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:53:05,888 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-18 17:53:05,889 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:53:05,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:53:05,889 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-18 17:53:05,889 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:53:05,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:53:05,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:53:06,070 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:53:06,071 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 17:53:06,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:53:06 BoogieIcfgContainer [2020-08-18 17:53:06,075 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:53:06,076 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:53:06,076 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:53:06,079 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:53:06,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:53:05" (1/3) ... [2020-08-18 17:53:06,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39de7e8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:53:06, skipping insertion in model container [2020-08-18 17:53:06,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:53:05" (2/3) ... [2020-08-18 17:53:06,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39de7e8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:53:06, skipping insertion in model container [2020-08-18 17:53:06,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:53:06" (3/3) ... [2020-08-18 17:53:06,083 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-2.c [2020-08-18 17:53:06,094 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:53:06,102 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:53:06,116 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:53:06,141 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:53:06,141 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:53:06,142 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:53:06,142 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:53:06,142 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:53:06,142 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:53:06,142 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:53:06,142 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:53:06,159 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 17:53:06,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 17:53:06,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:06,165 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:06,166 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:06,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:06,171 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-18 17:53:06,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:06,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644825070] [2020-08-18 17:53:06,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:06,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:06,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:06,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:53:06,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644825070] [2020-08-18 17:53:06,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:53:06,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:53:06,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740231923] [2020-08-18 17:53:06,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:53:06,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:06,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:53:06,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:53:06,419 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-18 17:53:06,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:06,587 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-18 17:53:06,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:53:06,589 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 17:53:06,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:06,599 INFO L225 Difference]: With dead ends: 30 [2020-08-18 17:53:06,600 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 17:53:06,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:53:06,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 17:53:06,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 17:53:06,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 17:53:06,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-18 17:53:06,642 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-18 17:53:06,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:06,643 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-18 17:53:06,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:53:06,643 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-18 17:53:06,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 17:53:06,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:06,646 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:06,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:53:06,647 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:06,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:06,647 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-18 17:53:06,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:06,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48997529] [2020-08-18 17:53:06,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:06,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:06,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:06,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:06,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 17:53:06,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48997529] [2020-08-18 17:53:06,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:06,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:53:06,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571528419] [2020-08-18 17:53:06,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:53:06,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:06,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:53:06,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:53:06,784 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-18 17:53:06,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:06,847 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-18 17:53:06,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:53:06,847 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 17:53:06,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:06,849 INFO L225 Difference]: With dead ends: 25 [2020-08-18 17:53:06,849 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 17:53:06,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:53:06,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 17:53:06,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 17:53:06,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:53:06,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 17:53:06,858 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-18 17:53:06,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:06,858 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 17:53:06,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:53:06,859 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 17:53:06,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 17:53:06,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:06,860 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:06,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:53:06,861 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:06,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:06,861 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-18 17:53:06,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:06,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542407394] [2020-08-18 17:53:06,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:06,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:06,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:06,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:06,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,091 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-18 17:53:07,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542407394] [2020-08-18 17:53:07,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:07,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:53:07,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431663888] [2020-08-18 17:53:07,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:53:07,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:07,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:53:07,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:53:07,094 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-18 17:53:07,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:07,185 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-18 17:53:07,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:53:07,186 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-18 17:53:07,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:07,187 INFO L225 Difference]: With dead ends: 28 [2020-08-18 17:53:07,187 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 17:53:07,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:53:07,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 17:53:07,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 17:53:07,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 17:53:07,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-18 17:53:07,196 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-18 17:53:07,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:07,196 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-18 17:53:07,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:53:07,197 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-18 17:53:07,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 17:53:07,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:07,198 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:07,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:53:07,199 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:07,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:07,199 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-18 17:53:07,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:07,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125969808] [2020-08-18 17:53:07,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:07,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:07,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,372 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-18 17:53:07,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125969808] [2020-08-18 17:53:07,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:07,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:53:07,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684082489] [2020-08-18 17:53:07,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:53:07,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:07,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:53:07,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:53:07,376 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-18 17:53:07,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:07,497 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-18 17:53:07,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:53:07,497 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-18 17:53:07,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:07,499 INFO L225 Difference]: With dead ends: 31 [2020-08-18 17:53:07,499 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 17:53:07,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:53:07,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 17:53:07,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 17:53:07,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 17:53:07,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 17:53:07,506 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-18 17:53:07,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:07,507 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 17:53:07,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:53:07,507 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 17:53:07,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 17:53:07,509 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:07,509 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:07,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:53:07,509 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:07,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:07,510 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-18 17:53:07,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:07,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729450839] [2020-08-18 17:53:07,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:07,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:07,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:07,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,680 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-18 17:53:07,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729450839] [2020-08-18 17:53:07,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:07,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:53:07,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967274364] [2020-08-18 17:53:07,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:53:07,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:07,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:53:07,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:53:07,683 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-18 17:53:07,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:07,771 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-18 17:53:07,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:53:07,772 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-18 17:53:07,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:07,773 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:53:07,774 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 17:53:07,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:53:07,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 17:53:07,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 17:53:07,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 17:53:07,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-18 17:53:07,782 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-18 17:53:07,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:07,782 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-18 17:53:07,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:53:07,783 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-18 17:53:07,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 17:53:07,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:07,784 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:07,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:53:07,785 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:07,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:07,785 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-18 17:53:07,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:07,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466412718] [2020-08-18 17:53:07,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:07,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:07,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:07,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:07,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:07,965 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-18 17:53:07,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466412718] [2020-08-18 17:53:07,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:07,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:53:07,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970446238] [2020-08-18 17:53:07,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:53:07,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:07,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:53:07,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:53:07,969 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-18 17:53:08,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:08,061 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-18 17:53:08,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:53:08,061 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-18 17:53:08,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:08,063 INFO L225 Difference]: With dead ends: 37 [2020-08-18 17:53:08,063 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 17:53:08,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:53:08,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 17:53:08,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 17:53:08,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:53:08,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 17:53:08,070 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-18 17:53:08,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:08,071 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 17:53:08,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:53:08,071 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 17:53:08,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 17:53:08,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:08,073 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:08,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:53:08,074 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:08,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:08,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-18 17:53:08,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:08,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558387465] [2020-08-18 17:53:08,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:08,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:08,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,296 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-18 17:53:08,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558387465] [2020-08-18 17:53:08,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:08,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:53:08,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078492352] [2020-08-18 17:53:08,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:53:08,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:08,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:53:08,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:53:08,299 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 17:53:08,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:08,420 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-18 17:53:08,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:53:08,421 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-18 17:53:08,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:08,422 INFO L225 Difference]: With dead ends: 40 [2020-08-18 17:53:08,423 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:53:08,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:53:08,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:53:08,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 17:53:08,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 17:53:08,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-18 17:53:08,437 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-18 17:53:08,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:08,437 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-18 17:53:08,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:53:08,437 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-18 17:53:08,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 17:53:08,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:08,440 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:08,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:53:08,441 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:08,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:08,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-18 17:53:08,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:08,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472101415] [2020-08-18 17:53:08,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:08,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:08,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:08,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,682 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-18 17:53:08,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472101415] [2020-08-18 17:53:08,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:08,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:53:08,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499078658] [2020-08-18 17:53:08,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:53:08,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:08,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:53:08,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:53:08,685 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-18 17:53:08,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:08,807 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-18 17:53:08,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:53:08,808 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-18 17:53:08,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:08,809 INFO L225 Difference]: With dead ends: 43 [2020-08-18 17:53:08,809 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 17:53:08,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:53:08,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 17:53:08,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 17:53:08,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:53:08,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 17:53:08,817 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-18 17:53:08,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:08,817 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 17:53:08,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:53:08,818 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 17:53:08,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 17:53:08,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:08,819 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:08,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:53:08,819 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:08,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:08,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-18 17:53:08,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:08,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799968185] [2020-08-18 17:53:08,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:08,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:08,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:08,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:08,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:08,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,088 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-18 17:53:09,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799968185] [2020-08-18 17:53:09,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:09,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:53:09,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11881156] [2020-08-18 17:53:09,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:53:09,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:09,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:53:09,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:53:09,091 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-18 17:53:09,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:09,227 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-18 17:53:09,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:53:09,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-18 17:53:09,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:09,229 INFO L225 Difference]: With dead ends: 46 [2020-08-18 17:53:09,229 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 17:53:09,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:53:09,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 17:53:09,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 17:53:09,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 17:53:09,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-18 17:53:09,237 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-18 17:53:09,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:09,237 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-18 17:53:09,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:53:09,238 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-18 17:53:09,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 17:53:09,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:09,239 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:09,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:53:09,239 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:09,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:09,240 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-18 17:53:09,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:09,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743594680] [2020-08-18 17:53:09,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:09,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:53:09,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:53:09,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 17:53:09,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:53:09,535 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-18 17:53:09,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743594680] [2020-08-18 17:53:09,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:53:09,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:53:09,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556891031] [2020-08-18 17:53:09,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:53:09,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:53:09,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:53:09,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:53:09,538 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-18 17:53:09,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:53:09,697 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 17:53:09,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:53:09,697 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-18 17:53:09,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:53:09,699 INFO L225 Difference]: With dead ends: 49 [2020-08-18 17:53:09,699 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 17:53:09,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:53:09,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 17:53:09,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 17:53:09,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 17:53:09,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-18 17:53:09,706 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-18 17:53:09,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:53:09,707 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-18 17:53:09,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:53:09,707 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-18 17:53:09,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 17:53:09,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:53:09,708 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:53:09,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:53:09,708 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:53:09,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:53:09,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-18 17:53:09,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:53:09,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395862002] [2020-08-18 17:53:09,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:53:09,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:53:09,728 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:53:09,729 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:53:09,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:53:09,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:53:09 BoogieIcfgContainer [2020-08-18 17:53:09,756 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:53:09,759 INFO L168 Benchmark]: Toolchain (without parser) took 4309.56 ms. Allocated memory was 144.7 MB in the beginning and 291.5 MB in the end (delta: 146.8 MB). Free memory was 100.5 MB in the beginning and 244.8 MB in the end (delta: -144.3 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,759 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 144.7 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,760 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.46 ms. Allocated memory is still 144.7 MB. Free memory was 100.3 MB in the beginning and 91.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,761 INFO L168 Benchmark]: Boogie Preprocessor took 23.71 ms. Allocated memory is still 144.7 MB. Free memory was 91.1 MB in the beginning and 89.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,762 INFO L168 Benchmark]: RCFGBuilder took 343.76 ms. Allocated memory was 144.7 MB in the beginning and 200.3 MB in the end (delta: 55.6 MB). Free memory was 89.8 MB in the beginning and 167.7 MB in the end (delta: -78.0 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,763 INFO L168 Benchmark]: TraceAbstraction took 3679.95 ms. Allocated memory was 200.3 MB in the beginning and 291.5 MB in the end (delta: 91.2 MB). Free memory was 167.0 MB in the beginning and 244.8 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-18 17:53:09,766 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 144.7 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.46 ms. Allocated memory is still 144.7 MB. Free memory was 100.3 MB in the beginning and 91.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.71 ms. Allocated memory is still 144.7 MB. Free memory was 91.1 MB in the beginning and 89.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 343.76 ms. Allocated memory was 144.7 MB in the beginning and 200.3 MB in the end (delta: 55.6 MB). Free memory was 89.8 MB in the beginning and 167.7 MB in the end (delta: -78.0 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3679.95 ms. Allocated memory was 200.3 MB in the beginning and 291.5 MB in the end (delta: 91.2 MB). Free memory was 167.0 MB in the beginning and 244.8 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 10; [L13] int b = 0; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.5s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 163 SDslu, 394 SDs, 0 SdLazy, 296 SolverSat, 18 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 270 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 473 NumberOfCodeBlocks, 473 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 390 ConstructedInterpolants, 0 QuantifiedInterpolants, 43800 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 10 InterpolantComputations, 1 PerfectInterpolantSequences, 450/900 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 incorrect! Received shutdown request...