/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 04:48:18,886 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 04:48:18,888 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 04:48:18,924 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-07 04:48:18,936 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 04:48:18,938 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 04:48:18,939 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 04:48:18,941 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 04:48:18,942 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 04:48:18,943 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 04:48:18,945 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 04:48:18,947 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 04:48:18,949 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 04:48:18,950 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 04:48:18,951 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 04:48:18,952 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 04:48:18,956 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 04:48:18,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 04:48:18,984 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 04:48:18,984 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 04:48:18,986 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 04:48:18,998 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 04:48:18,998 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 04:48:19,000 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 04:48:19,000 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 04:48:19,000 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 04:48:19,000 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 04:48:19,001 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 04:48:19,001 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 04:48:19,001 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 04:48:19,001 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 04:48:19,002 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 04:48:19,002 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 04:48:19,002 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 04:48:19,002 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 04:48:19,003 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 04:48:19,003 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 04:48:19,003 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 04:48:19,004 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 04:48:19,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 04:48:19,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 04:48:19,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 04:48:19,004 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 04:48:19,005 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 04:48:19,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 04:48:19,431 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 04:48:19,435 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 04:48:19,436 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 04:48:19,437 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 04:48:19,438 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-11-07 04:48:19,514 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1831c5c1/ed8e94865241465e84ea79dff070f8a5/FLAG1c8934ea7 [2020-11-07 04:48:20,148 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 04:48:20,149 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-11-07 04:48:20,158 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1831c5c1/ed8e94865241465e84ea79dff070f8a5/FLAG1c8934ea7 [2020-11-07 04:48:20,498 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1831c5c1/ed8e94865241465e84ea79dff070f8a5 [2020-11-07 04:48:20,501 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 04:48:20,507 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 04:48:20,509 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 04:48:20,510 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 04:48:20,513 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 04:48:20,514 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,518 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f201a56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20, skipping insertion in model container [2020-11-07 04:48:20,518 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,527 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 04:48:20,541 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 04:48:20,731 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 04:48:20,750 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 04:48:20,769 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 04:48:20,785 INFO L208 MainTranslator]: Completed translation [2020-11-07 04:48:20,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20 WrapperNode [2020-11-07 04:48:20,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 04:48:20,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 04:48:20,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 04:48:20,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 04:48:20,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,809 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,809 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,817 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (1/1) ... [2020-11-07 04:48:20,821 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 04:48:20,822 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 04:48:20,822 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 04:48:20,822 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 04:48:20,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (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 [2020-11-07 04:48:20,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 04:48:20,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 04:48:20,897 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 04:48:20,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-11-07 04:48:20,897 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 04:48:20,898 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 04:48:20,898 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 04:48:20,898 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 04:48:20,898 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 04:48:20,898 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 04:48:20,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 04:48:20,900 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 04:48:20,900 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 04:48:21,487 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 04:48:21,489 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-07 04:48:21,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:48:21 BoogieIcfgContainer [2020-11-07 04:48:21,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 04:48:21,498 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 04:48:21,499 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 04:48:21,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 04:48:21,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:48:20" (1/3) ... [2020-11-07 04:48:21,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@456fee9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:48:21, skipping insertion in model container [2020-11-07 04:48:21,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:48:20" (2/3) ... [2020-11-07 04:48:21,505 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@456fee9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:48:21, skipping insertion in model container [2020-11-07 04:48:21,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:48:21" (3/3) ... [2020-11-07 04:48:21,507 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-11-07 04:48:21,526 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 04:48:21,531 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 04:48:21,543 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 04:48:21,578 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 04:48:21,579 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 04:48:21,579 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 04:48:21,579 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 04:48:21,579 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 04:48:21,579 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 04:48:21,580 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 04:48:21,580 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 04:48:21,602 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2020-11-07 04:48:21,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-07 04:48:21,616 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:48:21,618 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:48:21,618 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:48:21,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:48:21,628 INFO L82 PathProgramCache]: Analyzing trace with hash -946996355, now seen corresponding path program 1 times [2020-11-07 04:48:21,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:48:21,640 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507183591] [2020-11-07 04:48:21,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:48:21,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:21,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 04:48:21,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-11-07 04:48:22,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 04:48:22,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507183591] [2020-11-07 04:48:22,061 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 04:48:22,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 04:48:22,063 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758857678] [2020-11-07 04:48:22,068 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 04:48:22,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 04:48:22,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 04:48:22,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 04:48:22,086 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 6 states. [2020-11-07 04:48:22,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 04:48:22,575 INFO L93 Difference]: Finished difference Result 101 states and 124 transitions. [2020-11-07 04:48:22,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-07 04:48:22,576 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-11-07 04:48:22,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 04:48:22,588 INFO L225 Difference]: With dead ends: 101 [2020-11-07 04:48:22,589 INFO L226 Difference]: Without dead ends: 54 [2020-11-07 04:48:22,593 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-11-07 04:48:22,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-11-07 04:48:22,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-11-07 04:48:22,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-11-07 04:48:22,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2020-11-07 04:48:22,654 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 33 [2020-11-07 04:48:22,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 04:48:22,655 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2020-11-07 04:48:22,655 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 04:48:22,655 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2020-11-07 04:48:22,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-07 04:48:22,659 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:48:22,659 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:48:22,659 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 04:48:22,660 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:48:22,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:48:22,661 INFO L82 PathProgramCache]: Analyzing trace with hash 300807360, now seen corresponding path program 1 times [2020-11-07 04:48:22,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:48:22,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203629234] [2020-11-07 04:48:22,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:48:22,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 04:48:22,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-11-07 04:48:22,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-07 04:48:22,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:22,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-07 04:48:22,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203629234] [2020-11-07 04:48:22,819 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 04:48:22,819 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-11-07 04:48:22,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553080413] [2020-11-07 04:48:22,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-07 04:48:22,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 04:48:22,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-07 04:48:22,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-11-07 04:48:22,823 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand 7 states. [2020-11-07 04:48:23,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 04:48:23,314 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2020-11-07 04:48:23,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-07 04:48:23,314 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 43 [2020-11-07 04:48:23,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 04:48:23,319 INFO L225 Difference]: With dead ends: 78 [2020-11-07 04:48:23,319 INFO L226 Difference]: Without dead ends: 71 [2020-11-07 04:48:23,321 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-11-07 04:48:23,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-11-07 04:48:23,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2020-11-07 04:48:23,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-11-07 04:48:23,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2020-11-07 04:48:23,344 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 43 [2020-11-07 04:48:23,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 04:48:23,344 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2020-11-07 04:48:23,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-07 04:48:23,345 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2020-11-07 04:48:23,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-11-07 04:48:23,348 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:48:23,348 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:48:23,348 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 04:48:23,348 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:48:23,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:48:23,349 INFO L82 PathProgramCache]: Analyzing trace with hash 167896605, now seen corresponding path program 2 times [2020-11-07 04:48:23,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:48:23,350 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127839001] [2020-11-07 04:48:23,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:48:23,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:23,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 04:48:23,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:23,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-11-07 04:48:23,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:23,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-07 04:48:23,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:23,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-07 04:48:23,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:48:23,526 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-07 04:48:23,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127839001] [2020-11-07 04:48:23,528 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 04:48:23,528 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-11-07 04:48:23,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226962165] [2020-11-07 04:48:23,529 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-07 04:48:23,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 04:48:23,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-07 04:48:23,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-07 04:48:23,532 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand 5 states. [2020-11-07 04:48:23,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 04:48:23,785 INFO L93 Difference]: Finished difference Result 125 states and 184 transitions. [2020-11-07 04:48:23,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 04:48:23,786 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 53 [2020-11-07 04:48:23,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 04:48:23,790 INFO L225 Difference]: With dead ends: 125 [2020-11-07 04:48:23,790 INFO L226 Difference]: Without dead ends: 75 [2020-11-07 04:48:23,793 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-07 04:48:23,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-11-07 04:48:23,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-11-07 04:48:23,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-11-07 04:48:23,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 98 transitions. [2020-11-07 04:48:23,820 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 98 transitions. Word has length 53 [2020-11-07 04:48:23,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 04:48:23,821 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 98 transitions. [2020-11-07 04:48:23,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-07 04:48:23,821 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 98 transitions. [2020-11-07 04:48:23,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-11-07 04:48:23,824 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:48:23,824 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:48:23,825 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 04:48:23,825 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:48:23,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:48:23,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1842837274, now seen corresponding path program 1 times [2020-11-07 04:48:23,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:48:23,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635582945] [2020-11-07 04:48:23,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:48:23,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 04:48:23,875 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 04:48:23,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 04:48:23,916 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 04:48:23,956 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 04:48:23,957 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 04:48:23,957 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 04:48:24,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:48:24 BoogieIcfgContainer [2020-11-07 04:48:24,011 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 04:48:24,014 INFO L168 Benchmark]: Toolchain (without parser) took 3510.36 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 126.7 MB in the beginning and 148.4 MB in the end (delta: -21.6 MB). Peak memory consumption was 23.0 MB. Max. memory is 8.0 GB. [2020-11-07 04:48:24,015 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory is still 125.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 04:48:24,016 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-11-07 04:48:24,017 INFO L168 Benchmark]: Boogie Preprocessor took 33.62 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-07 04:48:24,018 INFO L168 Benchmark]: RCFGBuilder took 671.96 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 99.3 MB in the end (delta: 16.1 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2020-11-07 04:48:24,019 INFO L168 Benchmark]: TraceAbstraction took 2513.20 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 99.1 MB in the beginning and 148.9 MB in the end (delta: -49.9 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 04:48:24,023 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory is still 125.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 277.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.62 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 671.96 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 99.3 MB in the end (delta: 16.1 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2513.20 ms. Allocated memory was 151.0 MB in the beginning and 195.0 MB in the end (delta: 44.0 MB). Free memory was 99.1 MB in the beginning and 148.9 MB in the end (delta: -49.9 MB). There was no memory consumed. 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(); VAL [__VERIFIER_nondet_int()=2, m=2] [L29] COND FALSE !(m < 0 || m > 3) VAL [m=2] [L34] int n = __VERIFIER_nondet_int(); VAL [__VERIFIER_nondet_int()=0, m=2, n=0] [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 VAL [\old(m)=0, \old(n)=1, m=0, n=1] [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); VAL [\old(m)=1, \old(n)=0, \result=2, ackermann(m-1,1)=2, m=1, n=0] [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 VAL [\old(m)=0, \old(n)=2, m=0, n=2] [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)); VAL [\old(m)=1, \old(n)=1, \result=3, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, 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); VAL [\old(m)=2, \old(n)=0, \result=3, ackermann(m-1,1)=3, m=2, n=0] [L41] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L41] int result = ackermann(m,n); VAL [ackermann(m,n)=3, m=2, n=0, result=3] [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, 56 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 155 SDtfs, 192 SDslu, 125 SDs, 0 SdLazy, 354 SolverSat, 91 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred 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, 201 NumberOfCodeBlocks, 201 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 126 ConstructedInterpolants, 0 QuantifiedInterpolants, 12192 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 22/25 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...