/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 0.1.25-3af5e1f [2020-09-04 13:01:09,191 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:01:09,195 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:01:09,220 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:01:09,220 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:01:09,221 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:01:09,223 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:01:09,224 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:01:09,226 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:01:09,227 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:01:09,228 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:01:09,229 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:01:09,229 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:01:09,232 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:01:09,233 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:01:09,234 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:01:09,235 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:01:09,236 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:01:09,237 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:01:09,239 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:01:09,241 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:01:09,242 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:01:09,243 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:01:09,244 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:01:09,246 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:01:09,254 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:01:09,255 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:01:09,256 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:01:09,257 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:01:09,283 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:01:09,284 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:01:09,285 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:01:09,285 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:01:09,285 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:01:09,285 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:01:09,286 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:01:09,286 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:01:09,286 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:01:09,286 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:01:09,286 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:01:09,287 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:01:09,287 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:01:09,287 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:01:09,287 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:01:09,287 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:01:09,288 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:01:09,288 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:01:09,288 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:01:09,288 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:01:09,289 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:01:09,289 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:01:09,289 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:01:09,289 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:01:09,289 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:01:09,290 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:01:09,290 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:01:09,290 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:01:09,290 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:01:09,290 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:01:09,718 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:01:09,735 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:01:09,739 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:01:09,741 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:01:09,741 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:01:09,742 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-04 13:01:09,817 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d8b6a381/723e4e945d2b4e71af39a10e545dc3f6/FLAGa048abf2f [2020-09-04 13:01:10,357 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:01:10,358 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-04 13:01:10,367 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d8b6a381/723e4e945d2b4e71af39a10e545dc3f6/FLAGa048abf2f [2020-09-04 13:01:10,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d8b6a381/723e4e945d2b4e71af39a10e545dc3f6 [2020-09-04 13:01:10,729 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:01:10,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:01:10,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:01:10,733 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:01:10,737 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:01:10,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:01:10" (1/1) ... [2020-09-04 13:01:10,742 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2de25899 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:10, skipping insertion in model container [2020-09-04 13:01:10,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:01:10" (1/1) ... [2020-09-04 13:01:10,751 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:01:10,777 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:01:10,979 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:01:10,984 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:01:11,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:01:11,017 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:01:11,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11 WrapperNode [2020-09-04 13:01:11,018 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:01:11,019 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:01:11,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:01:11,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:01:11,033 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,125 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,125 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,134 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,137 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... [2020-09-04 13:01:11,139 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:01:11,140 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:01:11,140 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:01:11,140 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:01:11,141 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:01:11,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:01:11,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:01:11,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-09-04 13:01:11,222 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:01:11,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:01:11,223 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 13:01:11,223 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-09-04 13:01:11,223 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:01:11,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:01:11,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:01:11,447 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:01:11,447 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 13:01:11,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:01:11 BoogieIcfgContainer [2020-09-04 13:01:11,454 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:01:11,463 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:01:11,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:01:11,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:01:11,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:01:10" (1/3) ... [2020-09-04 13:01:11,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5eca2b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:01:11, skipping insertion in model container [2020-09-04 13:01:11,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:01:11" (2/3) ... [2020-09-04 13:01:11,486 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5eca2b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:01:11, skipping insertion in model container [2020-09-04 13:01:11,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:01:11" (3/3) ... [2020-09-04 13:01:11,491 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-09-04 13:01:11,521 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:01:11,542 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:01:11,584 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:01:11,624 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:01:11,625 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:01:11,625 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:01:11,627 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:01:11,627 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:01:11,627 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:01:11,628 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:01:11,628 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:01:11,658 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-09-04 13:01:11,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-04 13:01:11,669 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:11,671 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:01:11,671 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:11,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:11,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-09-04 13:01:11,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:11,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204376143] [2020-09-04 13:01:11,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:11,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:11,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:11,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:11,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:01:11,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204376143] [2020-09-04 13:01:11,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:01:11,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:01:11,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032531605] [2020-09-04 13:01:11,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:01:11,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:11,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:01:11,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:01:12,001 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-09-04 13:01:12,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:12,238 INFO L93 Difference]: Finished difference Result 55 states and 77 transitions. [2020-09-04 13:01:12,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:01:12,241 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-09-04 13:01:12,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:12,262 INFO L225 Difference]: With dead ends: 55 [2020-09-04 13:01:12,263 INFO L226 Difference]: Without dead ends: 28 [2020-09-04 13:01:12,272 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 [2020-09-04 13:01:12,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-04 13:01:12,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-04 13:01:12,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 13:01:12,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-09-04 13:01:12,353 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2020-09-04 13:01:12,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:12,354 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-09-04 13:01:12,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:01:12,355 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-09-04 13:01:12,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-04 13:01:12,365 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:12,365 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] [2020-09-04 13:01:12,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:01:12,366 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:12,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:12,367 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-09-04 13:01:12,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:12,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233817770] [2020-09-04 13:01:12,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:12,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:12,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:12,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:12,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:01:12,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233817770] [2020-09-04 13:01:12,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343056241] [2020-09-04 13:01:12,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:12,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:12,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:01:12,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:12,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:01:12,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:12,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-09-04 13:01:12,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884396139] [2020-09-04 13:01:12,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:01:12,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:12,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:01:12,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:01:12,736 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 8 states. [2020-09-04 13:01:12,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:12,885 INFO L93 Difference]: Finished difference Result 60 states and 94 transitions. [2020-09-04 13:01:12,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:01:12,886 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-09-04 13:01:12,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:12,889 INFO L225 Difference]: With dead ends: 60 [2020-09-04 13:01:12,889 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 13:01:12,891 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 [2020-09-04 13:01:12,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 13:01:12,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-04 13:01:12,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-04 13:01:12,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-09-04 13:01:12,901 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2020-09-04 13:01:12,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:12,902 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-09-04 13:01:12,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:01:12,902 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-09-04 13:01:12,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 13:01:12,904 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:12,904 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] [2020-09-04 13:01:13,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:01:13,119 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:13,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:13,119 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-09-04 13:01:13,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:13,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523068405] [2020-09-04 13:01:13,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:13,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:01:13,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-04 13:01:13,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:01:13,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:01:13,208 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:01:13,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523068405] [2020-09-04 13:01:13,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19886545] [2020-09-04 13:01:13,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:01:13,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:01:13,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:01:13,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-09-04 13:01:13,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:01:13,314 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:01:13,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:01:13,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-09-04 13:01:13,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071825555] [2020-09-04 13:01:13,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 13:01:13,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:01:13,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 13:01:13,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:01:13,317 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 6 states. [2020-09-04 13:01:13,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:01:13,386 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-09-04 13:01:13,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 13:01:13,387 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-09-04 13:01:13,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:01:13,389 INFO L225 Difference]: With dead ends: 62 [2020-09-04 13:01:13,389 INFO L226 Difference]: Without dead ends: 37 [2020-09-04 13:01:13,390 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 [2020-09-04 13:01:13,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-04 13:01:13,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-04 13:01:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 13:01:13,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2020-09-04 13:01:13,400 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 29 [2020-09-04 13:01:13,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:01:13,400 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-09-04 13:01:13,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 13:01:13,401 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2020-09-04 13:01:13,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-04 13:01:13,402 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:01:13,402 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] [2020-09-04 13:01:13,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:01:13,617 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:01:13,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:01:13,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-09-04 13:01:13,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:01:13,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636635228] [2020-09-04 13:01:13,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:01:13,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:01:13,659 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:01:13,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:01:13,702 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:01:13,729 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:01:13,729 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:01:13,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 13:01:13,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:01:13 BoogieIcfgContainer [2020-09-04 13:01:13,786 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:01:13,790 INFO L168 Benchmark]: Toolchain (without parser) took 3057.47 ms. Allocated memory was 139.5 MB in the beginning and 229.6 MB in the end (delta: 90.2 MB). Free memory was 99.8 MB in the beginning and 178.6 MB in the end (delta: -78.8 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,792 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 139.5 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,794 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.13 ms. Allocated memory is still 139.5 MB. Free memory was 99.6 MB in the beginning and 90.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,795 INFO L168 Benchmark]: Boogie Preprocessor took 120.36 ms. Allocated memory was 139.5 MB in the beginning and 200.8 MB in the end (delta: 61.3 MB). Free memory was 90.0 MB in the beginning and 179.4 MB in the end (delta: -89.4 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,803 INFO L168 Benchmark]: RCFGBuilder took 314.03 ms. Allocated memory is still 200.8 MB. Free memory was 179.4 MB in the beginning and 165.9 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,804 INFO L168 Benchmark]: TraceAbstraction took 2323.28 ms. Allocated memory was 200.8 MB in the beginning and 229.6 MB in the end (delta: 28.8 MB). Free memory was 165.9 MB in the beginning and 178.6 MB in the end (delta: -12.7 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2020-09-04 13:01:13,811 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 139.5 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 286.13 ms. Allocated memory is still 139.5 MB. Free memory was 99.6 MB in the beginning and 90.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.36 ms. Allocated memory was 139.5 MB in the beginning and 200.8 MB in the end (delta: 61.3 MB). Free memory was 90.0 MB in the beginning and 179.4 MB in the end (delta: -89.4 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 314.03 ms. Allocated memory is still 200.8 MB. Free memory was 179.4 MB in the beginning and 165.9 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2323.28 ms. Allocated memory was 200.8 MB in the beginning and 229.6 MB in the end (delta: 28.8 MB). Free memory was 165.9 MB in the beginning and 178.6 MB in the end (delta: -12.7 MB). Peak memory consumption was 16.2 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: 2.1s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.5s, 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, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 159 NumberOfCodeBlocks, 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...