/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.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 03:20:09,505 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 03:20:09,507 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 03:20:09,522 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 03:20:09,532 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 03:20:09,533 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 03:20:09,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 03:20:09,535 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 03:20:09,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 03:20:09,537 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 03:20:09,539 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 03:20:09,541 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 03:20:09,542 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 03:20:09,544 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 03:20:09,545 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 03:20:09,546 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 03:20:09,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 03:20:09,556 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 03:20:09,557 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 03:20:09,558 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 03:20:09,558 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 03:20:09,573 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 03:20:09,573 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 03:20:09,574 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 03:20:09,575 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 03:20:09,575 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 03:20:09,575 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 03:20:09,575 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 03:20:09,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 03:20:09,576 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 03:20:09,576 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 03:20:09,576 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 03:20:09,576 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 03:20:09,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 03:20:09,577 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 03:20:09,577 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 03:20:09,577 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 03:20:09,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 03:20:09,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 03:20:09,578 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 03:20:09,578 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 03:20:09,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 03:20:09,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 03:20:09,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 03:20:09,579 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 03:20:09,579 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 03:20:09,579 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 03:20:09,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 03:20:09,579 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 03:20:09,580 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 03:20:09,580 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 03:20:09,856 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 03:20:09,868 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 03:20:09,871 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 03:20:09,872 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 03:20:09,873 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 03:20:09,873 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-20 03:20:09,947 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faf48c3bf/4a764ef1d5a44840831f2671b56e24e1/FLAG30aff0640 [2020-07-20 03:20:10,418 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 03:20:10,419 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-20 03:20:10,425 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faf48c3bf/4a764ef1d5a44840831f2671b56e24e1/FLAG30aff0640 [2020-07-20 03:20:10,765 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faf48c3bf/4a764ef1d5a44840831f2671b56e24e1 [2020-07-20 03:20:10,774 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 03:20:10,777 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 03:20:10,778 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 03:20:10,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 03:20:10,782 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 03:20:10,783 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:20:10" (1/1) ... [2020-07-20 03:20:10,786 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3077f9fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:10, skipping insertion in model container [2020-07-20 03:20:10,786 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:20:10" (1/1) ... [2020-07-20 03:20:10,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 03:20:10,812 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 03:20:10,970 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 03:20:10,975 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 03:20:10,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 03:20:11,008 INFO L208 MainTranslator]: Completed translation [2020-07-20 03:20:11,009 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11 WrapperNode [2020-07-20 03:20:11,009 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 03:20:11,010 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 03:20:11,010 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 03:20:11,010 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 03:20:11,024 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,025 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,030 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,030 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,034 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,036 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,037 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... [2020-07-20 03:20:11,039 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 03:20:11,040 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 03:20:11,040 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 03:20:11,040 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 03:20:11,041 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 03:20:11,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 03:20:11,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 03:20:11,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-20 03:20:11,185 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 03:20:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 03:20:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 03:20:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-20 03:20:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 03:20:11,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 03:20:11,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 03:20:11,377 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 03:20:11,378 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 03:20:11,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:20:11 BoogieIcfgContainer [2020-07-20 03:20:11,382 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 03:20:11,383 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 03:20:11,383 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 03:20:11,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 03:20:11,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:20:10" (1/3) ... [2020-07-20 03:20:11,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59c75310 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:20:11, skipping insertion in model container [2020-07-20 03:20:11,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:20:11" (2/3) ... [2020-07-20 03:20:11,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59c75310 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:20:11, skipping insertion in model container [2020-07-20 03:20:11,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:20:11" (3/3) ... [2020-07-20 03:20:11,390 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-07-20 03:20:11,401 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 03:20:11,408 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 03:20:11,424 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 03:20:11,455 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 03:20:11,455 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 03:20:11,455 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 03:20:11,456 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 03:20:11,456 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 03:20:11,456 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 03:20:11,456 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 03:20:11,456 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 03:20:11,488 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 03:20:11,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 03:20:11,498 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:20:11,499 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:20:11,499 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:20:11,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:20:11,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-20 03:20:11,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:20:11,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663018754] [2020-07-20 03:20:11,521 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b16daae [2020-07-20 03:20:11,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:11,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:11,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:11,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 03:20:11,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663018754] [2020-07-20 03:20:11,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 03:20:11,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 03:20:11,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382347810] [2020-07-20 03:20:11,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 03:20:11,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:20:11,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 03:20:11,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 03:20:11,760 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-20 03:20:11,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:20:11,916 INFO L93 Difference]: Finished difference Result 55 states and 77 transitions. [2020-07-20 03:20:11,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 03:20:11,919 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-20 03:20:11,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:20:11,931 INFO L225 Difference]: With dead ends: 55 [2020-07-20 03:20:11,931 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 03:20:11,936 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 [2020-07-20 03:20:11,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 03:20:11,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 03:20:11,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 03:20:11,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-07-20 03:20:11,992 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2020-07-20 03:20:11,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:20:11,993 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-07-20 03:20:11,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 03:20:11,993 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-07-20 03:20:11,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 03:20:11,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:20:11,996 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:20:11,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 03:20:11,997 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:20:11,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:20:11,998 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-20 03:20:11,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:20:11,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34297009] [2020-07-20 03:20:11,999 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b16daae [2020-07-20 03:20:12,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 03:20:12,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34297009] [2020-07-20 03:20:12,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664512415] [2020-07-20 03:20:12,126 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1aa2d9ce No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:20:12,226 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1aa2d9ce issued 2 check-sat command(s) [2020-07-20 03:20:12,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:20:12,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 03:20:12,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:20:12,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 03:20:12,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:20:12,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 03:20:12,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552570532] [2020-07-20 03:20:12,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 03:20:12,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:20:12,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 03:20:12,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 03:20:12,336 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 8 states. [2020-07-20 03:20:12,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:20:12,545 INFO L93 Difference]: Finished difference Result 60 states and 94 transitions. [2020-07-20 03:20:12,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 03:20:12,546 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 03:20:12,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:20:12,549 INFO L225 Difference]: With dead ends: 60 [2020-07-20 03:20:12,549 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 03:20:12,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-07-20 03:20:12,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 03:20:12,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 03:20:12,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 03:20:12,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-07-20 03:20:12,576 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2020-07-20 03:20:12,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:20:12,576 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-07-20 03:20:12,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 03:20:12,577 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-07-20 03:20:12,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 03:20:12,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:20:12,582 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:20:12,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-07-20 03:20:12,798 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:20:12,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:20:12,799 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-20 03:20:12,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:20:12,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249969280] [2020-07-20 03:20:12,801 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b16daae [2020-07-20 03:20:12,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:20:12,892 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 03:20:12,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249969280] [2020-07-20 03:20:12,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900526884] [2020-07-20 03:20:12,893 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1ffc7a99 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:20:12,948 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1ffc7a99 issued 3 check-sat command(s) [2020-07-20 03:20:12,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:20:12,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 03:20:12,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:20:12,991 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 03:20:12,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:20:12,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 03:20:12,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857613127] [2020-07-20 03:20:12,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 03:20:12,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:20:12,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 03:20:12,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 03:20:12,994 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 6 states. [2020-07-20 03:20:13,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:20:13,056 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-07-20 03:20:13,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 03:20:13,057 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-07-20 03:20:13,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:20:13,059 INFO L225 Difference]: With dead ends: 62 [2020-07-20 03:20:13,059 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 03:20:13,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 03:20:13,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 03:20:13,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 03:20:13,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 03:20:13,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2020-07-20 03:20:13,070 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 29 [2020-07-20 03:20:13,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:20:13,070 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-07-20 03:20:13,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 03:20:13,071 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2020-07-20 03:20:13,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 03:20:13,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:20:13,072 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:20:13,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:20:13,287 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:20:13,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:20:13,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-07-20 03:20:13,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:20:13,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510457837] [2020-07-20 03:20:13,289 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b16daae [2020-07-20 03:20:13,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 03:20:13,316 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 03:20:13,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 03:20:13,336 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 03:20:13,354 INFO L174 FreeRefinementEngine]: Strategy CAMEL_SMT_AM found a feasible trace [2020-07-20 03:20:13,354 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 03:20:13,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-20 03:20:13,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 03:20:13 BoogieIcfgContainer [2020-07-20 03:20:13,387 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 03:20:13,390 INFO L168 Benchmark]: Toolchain (without parser) took 2613.57 ms. Allocated memory was 136.8 MB in the beginning and 231.2 MB in the end (delta: 94.4 MB). Free memory was 101.8 MB in the beginning and 181.4 MB in the end (delta: -79.5 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-07-20 03:20:13,391 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 136.8 MB. Free memory is still 119.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 03:20:13,392 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.51 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 91.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-20 03:20:13,393 INFO L168 Benchmark]: Boogie Preprocessor took 29.53 ms. Allocated memory is still 136.8 MB. Free memory was 91.7 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 03:20:13,394 INFO L168 Benchmark]: RCFGBuilder took 342.34 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.4 MB in the beginning and 167.5 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-20 03:20:13,395 INFO L168 Benchmark]: TraceAbstraction took 2004.06 ms. Allocated memory was 200.8 MB in the beginning and 231.2 MB in the end (delta: 30.4 MB). Free memory was 166.5 MB in the beginning and 181.4 MB in the end (delta: -14.8 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. [2020-07-20 03:20:13,399 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 136.8 MB. Free memory is still 119.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 231.51 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 91.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.53 ms. Allocated memory is still 136.8 MB. Free memory was 91.7 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.34 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.4 MB in the beginning and 167.5 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2004.06 ms. Allocated memory was 200.8 MB in the beginning and 231.2 MB in the end (delta: 30.4 MB). Free memory was 166.5 MB in the beginning and 181.4 MB in the end (delta: -14.8 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) VAL [m=2, n=0] [L39] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L18] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L18] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L21] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L18] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L43] __VERIFIER_error() VAL [m=2, n=0, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 75 SDtfs, 41 SDslu, 180 SDs, 0 SdLazy, 150 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 159 NumberOfCodeBlocks, 144 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4382 SizeOfPredicates, 4 NumberOfNonLiveVariables, 128 ConjunctsInSsa, 9 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 32/38 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...