/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 0.2.0-b8ad66e [2020-10-23 17:57:02,643 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 17:57:02,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 17:57:02,683 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 17:57:02,684 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 17:57:02,686 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 17:57:02,688 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 17:57:02,717 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 17:57:02,721 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 17:57:02,728 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 17:57:02,729 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 17:57:02,733 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-10-23 17:57:02,798 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 17:57:02,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 17:57:02,800 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 17:57:02,801 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-23 17:57:02,870 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 17:57:02,870 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 17:57:02,876 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 17:57:02,876 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 17:57:02,876 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 17:57:02,877 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 17:57:02,877 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 17:57:02,877 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 17:57:02,877 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 17:57:02,878 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 17:57:02,879 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 17:57:02,879 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 17:57:02,880 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 17:57:02,880 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 17:57:02,880 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 17:57:02,880 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 17:57:02,880 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 17:57:02,881 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 17:57:02,881 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 17:57:02,881 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 17:57:02,881 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 17:57:02,882 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 17:57:02,882 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 17:57:02,882 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 17:57:02,882 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 17:57:02,883 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 17:57:02,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 17:57:02,883 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 17:57:02,883 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 17:57:02,883 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 17:57:03,336 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 17:57:03,373 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 17:57:03,376 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 17:57:03,378 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 17:57:03,379 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 17:57:03,380 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-23 17:57:03,461 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f2872926/07de8463e27143cc88cb3fcd19f7fe24/FLAG7eacb7e4e [2020-10-23 17:57:04,207 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 17:57:04,208 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-10-23 17:57:04,217 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f2872926/07de8463e27143cc88cb3fcd19f7fe24/FLAG7eacb7e4e [2020-10-23 17:57:04,551 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f2872926/07de8463e27143cc88cb3fcd19f7fe24 [2020-10-23 17:57:04,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 17:57:04,566 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 17:57:04,571 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 17:57:04,572 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 17:57:04,576 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 17:57:04,578 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,583 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c984b71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04, skipping insertion in model container [2020-10-23 17:57:04,583 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,594 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 17:57:04,613 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 17:57:04,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 17:57:04,811 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 17:57:04,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 17:57:04,849 INFO L208 MainTranslator]: Completed translation [2020-10-23 17:57:04,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04 WrapperNode [2020-10-23 17:57:04,849 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 17:57:04,851 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 17:57:04,851 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 17:57:04,851 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 17:57:04,867 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,876 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,877 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,883 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,886 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,887 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (1/1) ... [2020-10-23 17:57:04,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 17:57:04,891 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 17:57:04,891 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 17:57:04,892 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 17:57:04,893 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (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 [2020-10-23 17:57:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 17:57:04,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 17:57:04,988 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 17:57:04,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-10-23 17:57:04,988 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 17:57:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 17:57:04,989 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 17:57:04,990 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 17:57:04,990 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 17:57:04,990 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 17:57:04,991 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-10-23 17:57:04,991 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 17:57:04,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 17:57:04,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 17:57:04,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 17:57:04,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 17:57:04,994 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 17:57:04,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 17:57:05,454 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 17:57:05,455 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 17:57:05,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 05:57:05 BoogieIcfgContainer [2020-10-23 17:57:05,457 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 17:57:05,463 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 17:57:05,464 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 17:57:05,470 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 17:57:05,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 05:57:04" (1/3) ... [2020-10-23 17:57:05,474 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34d7aa9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 05:57:05, skipping insertion in model container [2020-10-23 17:57:05,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 05:57:04" (2/3) ... [2020-10-23 17:57:05,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34d7aa9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 05:57:05, skipping insertion in model container [2020-10-23 17:57:05,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 05:57:05" (3/3) ... [2020-10-23 17:57:05,484 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-10-23 17:57:05,524 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 17:57:05,535 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 17:57:05,571 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 17:57:05,606 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 17:57:05,606 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 17:57:05,606 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 17:57:05,606 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 17:57:05,607 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 17:57:05,607 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 17:57:05,607 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 17:57:05,607 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 17:57:05,628 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-10-23 17:57:05,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-23 17:57:05,636 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:57:05,637 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 17:57:05,638 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:57:05,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:57:05,646 INFO L82 PathProgramCache]: Analyzing trace with hash 192942640, now seen corresponding path program 1 times [2020-10-23 17:57:05,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:57:05,659 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705800955] [2020-10-23 17:57:05,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:57:05,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:57:06,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-23 17:57:06,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 17:57:06,146 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705800955] [2020-10-23 17:57:06,149 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 17:57:06,149 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 17:57:06,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008988895] [2020-10-23 17:57:06,160 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 17:57:06,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:57:06,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 17:57:06,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 17:57:06,184 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 6 states. [2020-10-23 17:57:06,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:57:06,582 INFO L93 Difference]: Finished difference Result 61 states and 84 transitions. [2020-10-23 17:57:06,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 17:57:06,584 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-10-23 17:57:06,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:57:06,597 INFO L225 Difference]: With dead ends: 61 [2020-10-23 17:57:06,597 INFO L226 Difference]: Without dead ends: 30 [2020-10-23 17:57:06,602 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 17:57:06,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-23 17:57:06,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-23 17:57:06,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-23 17:57:06,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-10-23 17:57:06,668 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 17 [2020-10-23 17:57:06,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:57:06,669 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-10-23 17:57:06,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 17:57:06,670 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-10-23 17:57:06,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-23 17:57:06,673 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:57:06,673 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, 1, 1] [2020-10-23 17:57:06,674 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 17:57:06,674 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:57:06,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:57:06,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1691639833, now seen corresponding path program 1 times [2020-10-23 17:57:06,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:57:06,678 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712797610] [2020-10-23 17:57:06,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:57:06,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:57:06,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-23 17:57:06,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:57:06,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:06,904 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 17:57:06,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712797610] [2020-10-23 17:57:06,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969223216] [2020-10-23 17:57:06,905 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 [2020-10-23 17:57:07,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:07,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-23 17:57:07,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:57:07,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 17:57:07,123 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:57:07,124 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2020-10-23 17:57:07,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470756927] [2020-10-23 17:57:07,126 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 17:57:07,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:57:07,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 17:57:07,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-10-23 17:57:07,128 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 9 states. [2020-10-23 17:57:07,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:57:07,723 INFO L93 Difference]: Finished difference Result 63 states and 97 transitions. [2020-10-23 17:57:07,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-23 17:57:07,724 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-10-23 17:57:07,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:57:07,726 INFO L225 Difference]: With dead ends: 63 [2020-10-23 17:57:07,726 INFO L226 Difference]: Without dead ends: 35 [2020-10-23 17:57:07,729 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2020-10-23 17:57:07,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-23 17:57:07,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-10-23 17:57:07,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-23 17:57:07,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-10-23 17:57:07,742 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 24 [2020-10-23 17:57:07,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:57:07,742 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-10-23 17:57:07,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 17:57:07,743 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-10-23 17:57:07,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-23 17:57:07,745 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:57:07,745 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, 1, 1] [2020-10-23 17:57:07,959 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-10-23 17:57:07,960 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:57:07,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:57:07,960 INFO L82 PathProgramCache]: Analyzing trace with hash -920167398, now seen corresponding path program 2 times [2020-10-23 17:57:07,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:57:07,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610247790] [2020-10-23 17:57:07,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:57:07,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:08,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 17:57:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:08,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-23 17:57:08,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:08,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:57:08,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:08,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 17:57:08,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 17:57:08,085 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-23 17:57:08,086 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610247790] [2020-10-23 17:57:08,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349613736] [2020-10-23 17:57:08,088 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 [2020-10-23 17:57:08,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 17:57:08,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 17:57:08,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 3 conjunts are in the unsatisfiable core [2020-10-23 17:57:08,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 17:57:08,219 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-23 17:57:08,220 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 17:57:08,220 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2020-10-23 17:57:08,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352676128] [2020-10-23 17:57:08,221 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 17:57:08,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 17:57:08,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 17:57:08,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-10-23 17:57:08,223 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 7 states. [2020-10-23 17:57:08,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 17:57:08,457 INFO L93 Difference]: Finished difference Result 65 states and 92 transitions. [2020-10-23 17:57:08,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-23 17:57:08,458 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2020-10-23 17:57:08,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 17:57:08,460 INFO L225 Difference]: With dead ends: 65 [2020-10-23 17:57:08,460 INFO L226 Difference]: Without dead ends: 39 [2020-10-23 17:57:08,462 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2020-10-23 17:57:08,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-23 17:57:08,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-23 17:57:08,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-23 17:57:08,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 50 transitions. [2020-10-23 17:57:08,476 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 50 transitions. Word has length 31 [2020-10-23 17:57:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 17:57:08,476 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 50 transitions. [2020-10-23 17:57:08,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 17:57:08,477 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 50 transitions. [2020-10-23 17:57:08,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-23 17:57:08,478 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 17:57:08,479 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, 1, 1, 1, 1, 1] [2020-10-23 17:57:08,689 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 17:57:08,690 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 17:57:08,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 17:57:08,692 INFO L82 PathProgramCache]: Analyzing trace with hash -561126020, now seen corresponding path program 1 times [2020-10-23 17:57:08,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 17:57:08,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470760148] [2020-10-23 17:57:08,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 17:57:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 17:57:08,751 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 17:57:08,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 17:57:08,800 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 17:57:08,844 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 17:57:08,844 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 17:57:08,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 17:57:08,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 05:57:08 BoogieIcfgContainer [2020-10-23 17:57:08,895 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 17:57:08,898 INFO L168 Benchmark]: Toolchain (without parser) took 4337.53 ms. Allocated memory was 152.0 MB in the beginning and 189.8 MB in the end (delta: 37.7 MB). Free memory was 127.9 MB in the beginning and 123.8 MB in the end (delta: 4.2 MB). Peak memory consumption was 43.5 MB. Max. memory is 8.0 GB. [2020-10-23 17:57:08,899 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 152.0 MB. Free memory is still 123.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 17:57:08,900 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.65 ms. Allocated memory is still 152.0 MB. Free memory was 127.3 MB in the beginning and 118.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 17:57:08,901 INFO L168 Benchmark]: Boogie Preprocessor took 39.31 ms. Allocated memory is still 152.0 MB. Free memory was 118.0 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 17:57:08,902 INFO L168 Benchmark]: RCFGBuilder took 566.19 ms. Allocated memory is still 152.0 MB. Free memory was 116.6 MB in the beginning and 134.7 MB in the end (delta: -18.1 MB). Peak memory consumption was 16.3 MB. Max. memory is 8.0 GB. [2020-10-23 17:57:08,904 INFO L168 Benchmark]: TraceAbstraction took 3432.13 ms. Allocated memory was 152.0 MB in the beginning and 189.8 MB in the end (delta: 37.7 MB). Free memory was 134.2 MB in the beginning and 123.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 49.2 MB. Max. memory is 8.0 GB. [2020-10-23 17:57:08,909 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 152.0 MB. Free memory is still 123.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 278.65 ms. Allocated memory is still 152.0 MB. Free memory was 127.3 MB in the beginning and 118.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.31 ms. Allocated memory is still 152.0 MB. Free memory was 118.0 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 566.19 ms. Allocated memory is still 152.0 MB. Free memory was 116.6 MB in the beginning and 134.7 MB in the end (delta: -18.1 MB). Peak memory consumption was 16.3 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3432.13 ms. Allocated memory was 152.0 MB in the beginning and 189.8 MB in the end (delta: 37.7 MB). Free memory was 134.2 MB in the beginning and 123.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 49.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_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) VAL [m=2, n=0] [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) VAL [ackermann(m,n)=3, m=2, n=0] [L41] int result = ackermann(m,n); [L42] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L45] CALL reach_error() [L3] __assert_fail("0", "Ackermann02.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.2s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 78 SDtfs, 106 SDslu, 73 SDs, 0 SdLazy, 275 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 98 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred 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, 0.7s InterpolantComputationTime, 171 NumberOfCodeBlocks, 171 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 122 ConstructedInterpolants, 0 QuantifiedInterpolants, 7076 SizeOfPredicates, 4 NumberOfNonLiveVariables, 284 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...