/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 06:58:04,054 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 06:58:04,057 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 06:58:04,092 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-22 06:58:04,163 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 06:58:04,164 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 06:58:04,165 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 06:58:04,168 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 06:58:04,196 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 06:58:04,197 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 06:58:04,202 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 06:58:04,202 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 06:58:04,203 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 06:58:04,203 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 06:58:04,203 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 06:58:04,203 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 06:58:04,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 06:58:04,204 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 06:58:04,204 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 06:58:04,204 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 06:58:04,205 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 06:58:04,205 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 06:58:04,205 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 06:58:04,205 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 06:58:04,205 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 06:58:04,205 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 06:58:04,206 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 06:58:04,206 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 06:58:04,209 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 06:58:04,209 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 06:58:04,210 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 06:58:04,210 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 06:58:04,210 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 06:58:04,210 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 06:58:04,566 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 06:58:04,596 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 06:58:04,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 06:58:04,600 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 06:58:04,605 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 06:58:04,606 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/Ackermann02.c [2020-12-22 06:58:04,697 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed72fa826/6c2f9e2a57a641aaa9e2df6242d25bdf/FLAG94c891d7e [2020-12-22 06:58:05,302 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 06:58:05,302 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c [2020-12-22 06:58:05,310 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed72fa826/6c2f9e2a57a641aaa9e2df6242d25bdf/FLAG94c891d7e [2020-12-22 06:58:05,675 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed72fa826/6c2f9e2a57a641aaa9e2df6242d25bdf [2020-12-22 06:58:05,679 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 06:58:05,682 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 06:58:05,684 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:05,684 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 06:58:05,688 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 06:58:05,689 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,692 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b930d6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05, skipping insertion in model container [2020-12-22 06:58:05,692 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,701 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 06:58:05,719 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 06:58:05,867 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2020-12-22 06:58:05,871 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:05,881 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 06:58:05,900 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2020-12-22 06:58:05,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:05,916 INFO L208 MainTranslator]: Completed translation [2020-12-22 06:58:05,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05 WrapperNode [2020-12-22 06:58:05,916 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:05,918 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:05,918 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 06:58:05,918 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 06:58:05,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,935 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,956 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:05,957 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 06:58:05,958 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 06:58:05,958 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 06:58:05,969 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,971 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,979 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (1/1) ... [2020-12-22 06:58:05,980 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 06:58:05,982 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 06:58:05,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 06:58:05,982 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 06:58:05,983 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (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 [2020-12-22 06:58:06,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 06:58:06,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 06:58:06,090 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-12-22 06:58:06,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-12-22 06:58:06,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 06:58:06,091 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 06:58:06,392 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 06:58:06,393 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 06:58:06,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06 BoogieIcfgContainer [2020-12-22 06:58:06,395 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 06:58:06,420 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 06:58:06,420 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 06:58:06,430 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 06:58:06,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 06:58:05" (1/3) ... [2020-12-22 06:58:06,432 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1623ee09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:06, skipping insertion in model container [2020-12-22 06:58:06,432 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:05" (2/3) ... [2020-12-22 06:58:06,433 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1623ee09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:06, skipping insertion in model container [2020-12-22 06:58:06,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06" (3/3) ... [2020-12-22 06:58:06,439 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-12-22 06:58:06,461 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 06:58:06,471 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 06:58:06,526 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 06:58:06,556 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 06:58:06,556 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 06:58:06,556 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 06:58:06,556 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 06:58:06,556 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 06:58:06,557 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 06:58:06,557 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 06:58:06,557 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 06:58:06,577 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-12-22 06:58:06,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-22 06:58:06,584 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:06,585 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:06,585 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:06,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:06,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1470704041, now seen corresponding path program 1 times [2020-12-22 06:58:06,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:06,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565151352] [2020-12-22 06:58:06,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:06,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:06,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:06,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 06:58:06,872 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565151352] [2020-12-22 06:58:06,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 06:58:06,873 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 06:58:06,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441123850] [2020-12-22 06:58:06,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 06:58:06,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:06,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 06:58:06,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 06:58:06,900 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-12-22 06:58:07,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:07,089 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-12-22 06:58:07,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 06:58:07,092 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-22 06:58:07,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:07,103 INFO L225 Difference]: With dead ends: 51 [2020-12-22 06:58:07,103 INFO L226 Difference]: Without dead ends: 25 [2020-12-22 06:58:07,107 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-22 06:58:07,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-22 06:58:07,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-12-22 06:58:07,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-22 06:58:07,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2020-12-22 06:58:07,160 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 12 [2020-12-22 06:58:07,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:07,160 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2020-12-22 06:58:07,160 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 06:58:07,161 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2020-12-22 06:58:07,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-22 06:58:07,163 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:07,164 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:07,164 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 06:58:07,164 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:07,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:07,165 INFO L82 PathProgramCache]: Analyzing trace with hash 941922339, now seen corresponding path program 1 times [2020-12-22 06:58:07,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:07,166 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144405107] [2020-12-22 06:58:07,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:07,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:07,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:07,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,326 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 06:58:07,326 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144405107] [2020-12-22 06:58:07,326 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151229363] [2020-12-22 06:58:07,327 INFO L95 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 [2020-12-22 06:58:07,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:07,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 06:58:07,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:07,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 06:58:07,617 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:07,617 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-12-22 06:58:07,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204384761] [2020-12-22 06:58:07,619 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 06:58:07,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:07,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 06:58:07,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-12-22 06:58:07,621 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 8 states. [2020-12-22 06:58:07,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:07,870 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2020-12-22 06:58:07,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 06:58:07,871 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-12-22 06:58:07,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:07,873 INFO L225 Difference]: With dead ends: 57 [2020-12-22 06:58:07,873 INFO L226 Difference]: Without dead ends: 30 [2020-12-22 06:58:07,876 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-12-22 06:58:07,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-22 06:58:07,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-22 06:58:07,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-22 06:58:07,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2020-12-22 06:58:07,885 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 19 [2020-12-22 06:58:07,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:07,886 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2020-12-22 06:58:07,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 06:58:07,886 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2020-12-22 06:58:07,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-22 06:58:07,888 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:07,889 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:08,102 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-22 06:58:08,103 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:08,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:08,104 INFO L82 PathProgramCache]: Analyzing trace with hash -952852693, now seen corresponding path program 2 times [2020-12-22 06:58:08,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:08,105 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953921885] [2020-12-22 06:58:08,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:08,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-22 06:58:08,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:08,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:08,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:08,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 06:58:08,277 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953921885] [2020-12-22 06:58:08,277 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428359533] [2020-12-22 06:58:08,278 INFO L93 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 [2020-12-22 06:58:08,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 06:58:08,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:08,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 06:58:08,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:08,399 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 06:58:08,400 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:08,400 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-22 06:58:08,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642527672] [2020-12-22 06:58:08,401 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 06:58:08,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:08,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 06:58:08,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-22 06:58:08,402 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 6 states. [2020-12-22 06:58:08,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:08,459 INFO L93 Difference]: Finished difference Result 59 states and 86 transitions. [2020-12-22 06:58:08,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 06:58:08,460 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-12-22 06:58:08,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:08,462 INFO L225 Difference]: With dead ends: 59 [2020-12-22 06:58:08,462 INFO L226 Difference]: Without dead ends: 34 [2020-12-22 06:58:08,463 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-22 06:58:08,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-22 06:58:08,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-22 06:58:08,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-22 06:58:08,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2020-12-22 06:58:08,476 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 26 [2020-12-22 06:58:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:08,476 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2020-12-22 06:58:08,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 06:58:08,477 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2020-12-22 06:58:08,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-22 06:58:08,479 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:08,479 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] [2020-12-22 06:58:08,693 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:08,694 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:08,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:08,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1429337198, now seen corresponding path program 1 times [2020-12-22 06:58:08,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:08,697 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507979361] [2020-12-22 06:58:08,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:08,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 06:58:08,724 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 06:58:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 06:58:08,749 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 06:58:08,775 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 06:58:08,775 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 06:58:08,775 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 06:58:08,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 06:58:08 BoogieIcfgContainer [2020-12-22 06:58:08,825 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 06:58:08,825 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 06:58:08,825 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 06:58:08,826 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 06:58:08,826 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:06" (3/4) ... [2020-12-22 06:58:08,828 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 06:58:08,933 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive/Ackermann02.c-witness.graphml [2020-12-22 06:58:08,933 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 06:58:08,935 INFO L168 Benchmark]: Toolchain (without parser) took 3251.99 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 105.9 MB in the end (delta: 20.5 MB). Peak memory consumption was 21.5 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,936 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 151.0 MB. Free memory is still 124.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 06:58:08,940 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.01 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,941 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.08 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 114.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,941 INFO L168 Benchmark]: Boogie Preprocessor took 23.21 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.9 MB in the end (delta: 862.1 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,942 INFO L168 Benchmark]: RCFGBuilder took 413.22 ms. Allocated memory is still 151.0 MB. Free memory was 113.8 MB in the beginning and 101.1 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,943 INFO L168 Benchmark]: TraceAbstraction took 2405.18 ms. Allocated memory is still 151.0 MB. Free memory was 134.0 MB in the beginning and 109.1 MB in the end (delta: 24.9 MB). Peak memory consumption was 24.9 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,944 INFO L168 Benchmark]: Witness Printer took 107.73 ms. Allocated memory is still 151.0 MB. Free memory was 109.1 MB in the beginning and 105.9 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:08,952 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 151.0 MB. Free memory is still 124.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 233.01 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 39.08 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 114.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 23.21 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.9 MB in the end (delta: 862.1 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 413.22 ms. Allocated memory is still 151.0 MB. Free memory was 113.8 MB in the beginning and 101.1 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2405.18 ms. Allocated memory is still 151.0 MB. Free memory was 134.0 MB in the beginning and 109.1 MB in the end (delta: 24.9 MB). Peak memory consumption was 24.9 MB. Max. memory is 8.0 GB. * Witness Printer took 107.73 ms. Allocated memory is still 151.0 MB. Free memory was 109.1 MB in the beginning and 105.9 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 45]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L28] int m = __VERIFIER_nondet_int(); [L29] COND FALSE !(m < 0 || m > 3) [L34] int n = __VERIFIER_nondet_int(); [L35] COND FALSE !(n < 0 || n > 23) [L41] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L17] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L20] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L21] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L17] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L20] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L23] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L17] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L20] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L21] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L17] COND TRUE m==0 [L18] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L21] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L21] return ackermann(m-1,1); [L23] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L23] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L17] COND TRUE m==0 [L18] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L23] 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] [L23] return ackermann(m-1,ackermann(m,n-1)); [L21] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L21] return ackermann(m-1,1); [L41] RET, EXPR ackermann(m,n) [L41] int result = ackermann(m,n); [L42] COND FALSE !(m < 2 || result >= 4) [L45] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.2s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 65 SDtfs, 46 SDslu, 135 SDs, 0 SdLazy, 148 SolverSat, 24 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 75 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred 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, 0.6s InterpolantComputationTime, 141 NumberOfCodeBlocks, 141 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 97 ConstructedInterpolants, 0 QuantifiedInterpolants, 3521 SizeOfPredicates, 3 NumberOfNonLiveVariables, 194 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...