/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-bitabs-dcfa08f [2020-12-23 09:21:19,822 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 09:21:19,827 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 09:21:19,888 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-23 09:21:20,001 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 09:21:20,050 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 09:21:20,050 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 09:21:20,055 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 09:21:20,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 09:21:20,055 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 09:21:20,056 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 09:21:20,056 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 09:21:20,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 09:21:20,056 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 09:21:20,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 09:21:20,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 09:21:20,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 09:21:20,059 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 09:21:20,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 09:21:20,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 09:21:20,059 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 09:21:20,059 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 09:21:20,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 09:21:20,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 09:21:20,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 09:21:20,060 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 09:21:20,060 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 09:21:20,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 09:21:20,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 09:21:20,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 09:21:20,061 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 09:21:20,517 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 09:21:20,548 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 09:21:20,551 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 09:21:20,553 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 09:21:20,554 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 09:21:20,555 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/Ackermann02.c [2020-12-23 09:21:20,645 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/236196162/b3164b4a58b14368b17603711b6e0c5f/FLAGa1d0171f5 [2020-12-23 09:21:21,372 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 09:21:21,372 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c [2020-12-23 09:21:21,383 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/236196162/b3164b4a58b14368b17603711b6e0c5f/FLAGa1d0171f5 [2020-12-23 09:21:21,740 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/236196162/b3164b4a58b14368b17603711b6e0c5f [2020-12-23 09:21:21,743 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 09:21:21,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 09:21:21,752 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 09:21:21,752 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 09:21:21,756 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 09:21:21,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 09:21:21" (1/1) ... [2020-12-23 09:21:21,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36243e1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:21, skipping insertion in model container [2020-12-23 09:21:21,761 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 09:21:21" (1/1) ... [2020-12-23 09:21:21,770 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 09:21:21,787 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 09:21:21,958 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2020-12-23 09:21:21,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 09:21:21,973 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 09:21:21,993 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2020-12-23 09:21:21,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 09:21:22,011 INFO L208 MainTranslator]: Completed translation [2020-12-23 09:21:22,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22 WrapperNode [2020-12-23 09:21:22,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 09:21:22,014 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 09:21:22,014 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 09:21:22,014 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 09:21:22,024 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,033 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,054 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 09:21:22,055 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 09:21:22,055 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 09:21:22,055 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 09:21:22,066 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,067 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,068 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,073 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,075 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... [2020-12-23 09:21:22,078 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 09:21:22,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 09:21:22,080 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 09:21:22,080 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 09:21:22,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 09:21:22,199 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 09:21:22,200 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 09:21:22,201 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-12-23 09:21:22,201 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-12-23 09:21:22,201 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 09:21:22,201 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 09:21:22,632 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 09:21:22,632 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-23 09:21:22,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:21:22 BoogieIcfgContainer [2020-12-23 09:21:22,638 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 09:21:22,643 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 09:21:22,644 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 09:21:22,653 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 09:21:22,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 09:21:21" (1/3) ... [2020-12-23 09:21:22,655 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ad41772 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 09:21:22, skipping insertion in model container [2020-12-23 09:21:22,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:21:22" (2/3) ... [2020-12-23 09:21:22,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ad41772 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 09:21:22, skipping insertion in model container [2020-12-23 09:21:22,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:21:22" (3/3) ... [2020-12-23 09:21:22,661 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-12-23 09:21:22,678 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 09:21:22,690 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 09:21:22,723 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 09:21:22,772 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 09:21:22,772 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 09:21:22,772 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 09:21:22,773 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 09:21:22,773 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 09:21:22,773 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 09:21:22,773 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 09:21:22,773 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 09:21:22,801 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-12-23 09:21:22,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 09:21:22,808 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:21:22,809 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 09:21:22,809 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:21:22,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:21:22,818 INFO L82 PathProgramCache]: Analyzing trace with hash 1470704041, now seen corresponding path program 1 times [2020-12-23 09:21:22,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:21:22,833 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496197507] [2020-12-23 09:21:22,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:21:23,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-23 09:21:23,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 09:21:23,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496197507] [2020-12-23 09:21:23,267 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 09:21:23,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 09:21:23,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59727993] [2020-12-23 09:21:23,273 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 09:21:23,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:21:23,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 09:21:23,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-23 09:21:23,288 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-12-23 09:21:23,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:21:23,405 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-12-23 09:21:23,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 09:21:23,408 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-23 09:21:23,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:21:23,418 INFO L225 Difference]: With dead ends: 51 [2020-12-23 09:21:23,418 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 09:21:23,422 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 [2020-12-23 09:21:23,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 09:21:23,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-12-23 09:21:23,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 09:21:23,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2020-12-23 09:21:23,473 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 12 [2020-12-23 09:21:23,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:21:23,474 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2020-12-23 09:21:23,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 09:21:23,474 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2020-12-23 09:21:23,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 09:21:23,477 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:21:23,477 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 09:21:23,478 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 09:21:23,478 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:21:23,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:21:23,479 INFO L82 PathProgramCache]: Analyzing trace with hash 941922339, now seen corresponding path program 1 times [2020-12-23 09:21:23,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:21:23,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198615494] [2020-12-23 09:21:23,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:21:23,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-23 09:21:23,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-23 09:21:23,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 09:21:23,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198615494] [2020-12-23 09:21:23,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112085022] [2020-12-23 09:21:23,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 09:21:23,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:23,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 09:21:23,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 09:21:23,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-23 09:21:23,917 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 09:21:23,917 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-12-23 09:21:23,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779910266] [2020-12-23 09:21:23,920 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 09:21:23,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:21:23,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 09:21:23,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-12-23 09:21:23,922 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 8 states. [2020-12-23 09:21:24,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:21:24,178 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2020-12-23 09:21:24,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 09:21:24,179 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-12-23 09:21:24,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:21:24,181 INFO L225 Difference]: With dead ends: 57 [2020-12-23 09:21:24,182 INFO L226 Difference]: Without dead ends: 30 [2020-12-23 09:21:24,186 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-12-23 09:21:24,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-23 09:21:24,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-23 09:21:24,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-23 09:21:24,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2020-12-23 09:21:24,198 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 19 [2020-12-23 09:21:24,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:21:24,198 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2020-12-23 09:21:24,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 09:21:24,199 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2020-12-23 09:21:24,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 09:21:24,203 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:21:24,203 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 09:21:24,404 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 09:21:24,405 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:21:24,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:21:24,407 INFO L82 PathProgramCache]: Analyzing trace with hash -952852693, now seen corresponding path program 2 times [2020-12-23 09:21:24,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:21:24,408 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221991191] [2020-12-23 09:21:24,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:21:24,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:24,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-23 09:21:24,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:24,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-23 09:21:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:24,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-23 09:21:24,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:21:24,516 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 09:21:24,517 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221991191] [2020-12-23 09:21:24,517 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031038834] [2020-12-23 09:21:24,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 09:21:24,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 09:21:24,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 09:21:24,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 09:21:24,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 09:21:24,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 09:21:24,644 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 09:21:24,645 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-23 09:21:24,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126090978] [2020-12-23 09:21:24,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 09:21:24,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:21:24,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 09:21:24,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 09:21:24,647 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 6 states. [2020-12-23 09:21:24,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:21:24,728 INFO L93 Difference]: Finished difference Result 59 states and 86 transitions. [2020-12-23 09:21:24,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 09:21:24,729 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-12-23 09:21:24,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:21:24,732 INFO L225 Difference]: With dead ends: 59 [2020-12-23 09:21:24,732 INFO L226 Difference]: Without dead ends: 34 [2020-12-23 09:21:24,734 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 [2020-12-23 09:21:24,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-23 09:21:24,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-23 09:21:24,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-23 09:21:24,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2020-12-23 09:21:24,764 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 26 [2020-12-23 09:21:24,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:21:24,765 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2020-12-23 09:21:24,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 09:21:24,765 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2020-12-23 09:21:24,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 09:21:24,769 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:21:24,770 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] [2020-12-23 09:21:24,970 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 09:21:24,971 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:21:24,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:21:24,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1429337198, now seen corresponding path program 1 times [2020-12-23 09:21:24,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:21:24,974 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529897226] [2020-12-23 09:21:24,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:21:25,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 09:21:25,029 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 09:21:25,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 09:21:25,087 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 09:21:25,118 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-23 09:21:25,118 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-23 09:21:25,119 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 09:21:25,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 09:21:25 BoogieIcfgContainer [2020-12-23 09:21:25,194 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 09:21:25,195 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 09:21:25,195 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 09:21:25,195 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 09:21:25,196 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:21:22" (3/4) ... [2020-12-23 09:21:25,198 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-23 09:21:25,268 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive/Ackermann02.c-witness.graphml [2020-12-23 09:21:25,269 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 09:21:25,271 INFO L168 Benchmark]: Toolchain (without parser) took 3523.86 ms. Allocated memory was 161.5 MB in the beginning and 206.6 MB in the end (delta: 45.1 MB). Free memory was 136.2 MB in the beginning and 169.9 MB in the end (delta: -33.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 8.0 GB. [2020-12-23 09:21:25,272 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 161.5 MB. Free memory is still 133.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 09:21:25,272 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.62 ms. Allocated memory is still 161.5 MB. Free memory was 136.0 MB in the beginning and 126.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-23 09:21:25,273 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.49 ms. Allocated memory is still 161.5 MB. Free memory was 126.6 MB in the beginning and 125.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 09:21:25,274 INFO L168 Benchmark]: Boogie Preprocessor took 23.83 ms. Allocated memory is still 161.5 MB. Free memory was 125.2 MB in the beginning and 124.3 MB in the end (delta: 904.9 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 09:21:25,275 INFO L168 Benchmark]: RCFGBuilder took 558.70 ms. Allocated memory is still 161.5 MB. Free memory was 124.2 MB in the beginning and 111.3 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-23 09:21:25,275 INFO L168 Benchmark]: TraceAbstraction took 2550.57 ms. Allocated memory was 161.5 MB in the beginning and 206.6 MB in the end (delta: 45.1 MB). Free memory was 110.9 MB in the beginning and 173.1 MB in the end (delta: -62.2 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 09:21:25,276 INFO L168 Benchmark]: Witness Printer took 74.22 ms. Allocated memory is still 206.6 MB. Free memory was 173.1 MB in the beginning and 169.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-23 09:21:25,280 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 161.5 MB. Free memory is still 133.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 260.62 ms. Allocated memory is still 161.5 MB. Free memory was 136.0 MB in the beginning and 126.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 40.49 ms. Allocated memory is still 161.5 MB. Free memory was 126.6 MB in the beginning and 125.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 23.83 ms. Allocated memory is still 161.5 MB. Free memory was 125.2 MB in the beginning and 124.3 MB in the end (delta: 904.9 kB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 558.70 ms. Allocated memory is still 161.5 MB. Free memory was 124.2 MB in the beginning and 111.3 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2550.57 ms. Allocated memory was 161.5 MB in the beginning and 206.6 MB in the end (delta: 45.1 MB). Free memory was 110.9 MB in the beginning and 173.1 MB in the end (delta: -62.2 MB). There was no memory consumed. Max. memory is 8.0 GB. * Witness Printer took 74.22 ms. Allocated memory is still 206.6 MB. Free memory was 173.1 MB in the beginning and 169.9 MB in the end (delta: 3.1 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: 2.3s, 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, 0.1s 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, 0.2s 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...