/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 11:44:15,332 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 11:44:15,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 11:44:15,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 11:44:15,351 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 11:44:15,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 11:44:15,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 11:44:15,366 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 11:44:15,369 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 11:44:15,370 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 11:44:15,372 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 11:44:15,373 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 11:44:15,373 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 11:44:15,376 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 11:44:15,378 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 11:44:15,380 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 11:44:15,382 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 11:44:15,385 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 11:44:15,388 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 11:44:15,393 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 11:44:15,398 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 11:44:15,400 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 11:44:15,404 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 11:44:15,404 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 11:44:15,407 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 11:44:15,419 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 11:44:15,420 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 11:44:15,421 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 11:44:15,422 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 [2020-07-17 11:44:15,444 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 11:44:15,445 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 11:44:15,447 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-17 11:44:15,447 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-17 11:44:15,447 INFO L138 SettingsManager]: * Use SBE=true [2020-07-17 11:44:15,448 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 11:44:15,448 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 11:44:15,448 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 11:44:15,448 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 11:44:15,448 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 11:44:15,450 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 11:44:15,450 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 11:44:15,450 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 11:44:15,451 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 11:44:15,451 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 11:44:15,451 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 11:44:15,451 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 11:44:15,451 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 11:44:15,452 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-17 11:44:15,452 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 11:44:15,452 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 11:44:15,452 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 11:44:15,452 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-17 11:44:15,453 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-17 11:44:15,710 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 11:44:15,723 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 11:44:15,726 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 11:44:15,727 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 11:44:15,728 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 11:44:15,729 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-17 11:44:15,789 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/995d28d23/906b9fdd5d7e4e00b83aa3b7347cad12/FLAG0134c0e04 [2020-07-17 11:44:16,246 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 11:44:16,249 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-17 11:44:16,256 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/995d28d23/906b9fdd5d7e4e00b83aa3b7347cad12/FLAG0134c0e04 [2020-07-17 11:44:16,637 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/995d28d23/906b9fdd5d7e4e00b83aa3b7347cad12 [2020-07-17 11:44:16,648 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 11:44:16,651 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 11:44:16,652 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 11:44:16,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 11:44:16,656 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 11:44:16,657 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,660 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3de36573 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16, skipping insertion in model container [2020-07-17 11:44:16,660 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,668 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 11:44:16,685 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 11:44:16,877 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 11:44:16,883 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 11:44:16,905 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 11:44:16,920 INFO L208 MainTranslator]: Completed translation [2020-07-17 11:44:16,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16 WrapperNode [2020-07-17 11:44:16,921 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 11:44:16,922 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 11:44:16,922 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 11:44:16,922 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 11:44:16,933 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,933 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,938 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,941 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,944 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (1/1) ... [2020-07-17 11:44:16,946 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 11:44:16,947 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 11:44:16,947 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 11:44:16,947 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 11:44:16,948 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (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 [2020-07-17 11:44:17,094 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 11:44:17,094 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 11:44:17,094 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-17 11:44:17,094 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 11:44:17,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 11:44:17,292 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 11:44:17,292 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-17 11:44:17,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 11:44:17 BoogieIcfgContainer [2020-07-17 11:44:17,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 11:44:17,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 11:44:17,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 11:44:17,300 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 11:44:17,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 11:44:16" (1/3) ... [2020-07-17 11:44:17,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a049732 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 11:44:17, skipping insertion in model container [2020-07-17 11:44:17,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 11:44:16" (2/3) ... [2020-07-17 11:44:17,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a049732 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 11:44:17, skipping insertion in model container [2020-07-17 11:44:17,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 11:44:17" (3/3) ... [2020-07-17 11:44:17,304 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-07-17 11:44:17,315 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-17 11:44:17,322 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 11:44:17,343 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 11:44:17,388 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 11:44:17,388 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 11:44:17,388 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-17 11:44:17,389 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 11:44:17,389 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 11:44:17,389 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 11:44:17,389 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 11:44:17,389 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 11:44:17,417 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-17 11:44:17,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-17 11:44:17,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 11:44:17,431 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 11:44:17,431 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 11:44:17,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 11:44:17,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-17 11:44:17,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 11:44:17,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749457965] [2020-07-17 11:44:17,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 11:44:17,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:17,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:17,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:17,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 11:44:17,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749457965] [2020-07-17 11:44:17,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 11:44:17,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 11:44:17,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130344336] [2020-07-17 11:44:17,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 11:44:17,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 11:44:17,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 11:44:17,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-17 11:44:17,699 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-17 11:44:17,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 11:44:17,864 INFO L93 Difference]: Finished difference Result 55 states and 77 transitions. [2020-07-17 11:44:17,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-17 11:44:17,867 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-17 11:44:17,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 11:44:17,879 INFO L225 Difference]: With dead ends: 55 [2020-07-17 11:44:17,879 INFO L226 Difference]: Without dead ends: 28 [2020-07-17 11:44:17,884 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 [2020-07-17 11:44:17,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-17 11:44:17,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-17 11:44:17,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-17 11:44:17,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-07-17 11:44:17,936 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2020-07-17 11:44:17,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 11:44:17,937 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-07-17 11:44:17,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 11:44:17,937 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-07-17 11:44:17,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-17 11:44:17,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 11:44:17,941 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] [2020-07-17 11:44:17,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 11:44:17,941 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 11:44:17,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 11:44:17,942 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-17 11:44:17,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 11:44:17,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048823455] [2020-07-17 11:44:17,943 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 11:44:17,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:17,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-17 11:44:18,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048823455] [2020-07-17 11:44:18,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790694989] [2020-07-17 11:44:18,065 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-17 11:44:18,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,104 INFO L264 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-17 11:44:18,111 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-17 11:44:18,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-17 11:44:18,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-17 11:44:18,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-17 11:44:18,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549654518] [2020-07-17 11:44:18,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 11:44:18,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 11:44:18,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 11:44:18,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 11:44:18,190 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 8 states. [2020-07-17 11:44:18,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 11:44:18,338 INFO L93 Difference]: Finished difference Result 60 states and 94 transitions. [2020-07-17 11:44:18,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 11:44:18,339 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-17 11:44:18,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 11:44:18,341 INFO L225 Difference]: With dead ends: 60 [2020-07-17 11:44:18,342 INFO L226 Difference]: Without dead ends: 33 [2020-07-17 11:44:18,344 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 [2020-07-17 11:44:18,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-17 11:44:18,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-17 11:44:18,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-17 11:44:18,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-07-17 11:44:18,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2020-07-17 11:44:18,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 11:44:18,354 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-07-17 11:44:18,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 11:44:18,355 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-07-17 11:44:18,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-17 11:44:18,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 11:44:18,357 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] [2020-07-17 11:44:18,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-07-17 11:44:18,565 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 11:44:18,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 11:44:18,566 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-17 11:44:18,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 11:44:18,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278139429] [2020-07-17 11:44:18,568 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 11:44:18,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 11:44:18,671 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-17 11:44:18,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278139429] [2020-07-17 11:44:18,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687915503] [2020-07-17 11:44:18,672 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-07-17 11:44:18,719 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-07-17 11:44:18,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-17 11:44:18,720 INFO L264 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-17 11:44:18,722 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-17 11:44:18,747 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-17 11:44:18,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-17 11:44:18,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-17 11:44:18,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391483836] [2020-07-17 11:44:18,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 11:44:18,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 11:44:18,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 11:44:18,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-17 11:44:18,750 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 6 states. [2020-07-17 11:44:18,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 11:44:18,808 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-07-17 11:44:18,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-17 11:44:18,809 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-07-17 11:44:18,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 11:44:18,811 INFO L225 Difference]: With dead ends: 62 [2020-07-17 11:44:18,811 INFO L226 Difference]: Without dead ends: 37 [2020-07-17 11:44:18,812 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 [2020-07-17 11:44:18,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-17 11:44:18,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-17 11:44:18,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-17 11:44:18,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2020-07-17 11:44:18,822 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 29 [2020-07-17 11:44:18,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 11:44:18,823 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-07-17 11:44:18,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 11:44:18,823 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2020-07-17 11:44:18,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-17 11:44:18,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 11:44:18,825 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] [2020-07-17 11:44:19,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-17 11:44:19,039 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 11:44:19,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 11:44:19,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-07-17 11:44:19,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 11:44:19,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460519661] [2020-07-17 11:44:19,040 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 11:44:19,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 11:44:19,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 11:44:19,101 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-17 11:44:19,101 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 11:44:19,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 11:44:19,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 11:44:19 BoogieIcfgContainer [2020-07-17 11:44:19,134 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 11:44:19,137 INFO L168 Benchmark]: Toolchain (without parser) took 2487.18 ms. Allocated memory was 138.9 MB in the beginning and 235.4 MB in the end (delta: 96.5 MB). Free memory was 102.4 MB in the beginning and 183.1 MB in the end (delta: -80.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,138 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,139 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.61 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,140 INFO L168 Benchmark]: Boogie Preprocessor took 24.52 ms. Allocated memory is still 138.9 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,141 INFO L168 Benchmark]: RCFGBuilder took 349.30 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 91.2 MB in the beginning and 169.8 MB in the end (delta: -78.6 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,142 INFO L168 Benchmark]: TraceAbstraction took 1837.52 ms. Allocated memory was 203.4 MB in the beginning and 235.4 MB in the end (delta: 32.0 MB). Free memory was 169.1 MB in the beginning and 183.1 MB in the end (delta: -14.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. [2020-07-17 11:44:19,146 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.61 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.52 ms. Allocated memory is still 138.9 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 349.30 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 91.2 MB in the beginning and 169.8 MB in the end (delta: -78.6 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1837.52 ms. Allocated memory was 203.4 MB in the beginning and 235.4 MB in the end (delta: 32.0 MB). Free memory was 169.1 MB in the beginning and 183.1 MB in the end (delta: -14.0 MB). Peak memory consumption was 18.0 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: 1.7s, 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, 0.3s InterpolantComputationTime, 159 NumberOfCodeBlocks, 159 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4382 SizeOfPredicates, 4 NumberOfNonLiveVariables, 152 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...