/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 18:33:21,737 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 18:33:21,740 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 18:33:21,762 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 18:33:21,771 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 18:33:21,772 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 18:33:21,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 18:33:21,774 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 18:33:21,774 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 18:33:21,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 18:33:21,777 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 18:33:21,779 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 18:33:21,780 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 18:33:21,781 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 18:33:21,782 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 18:33:21,783 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 18:33:21,785 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 18:33:21,792 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 18:33:21,793 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 18:33:21,793 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 18:33:21,794 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 18:33:21,803 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 18:33:21,803 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 18:33:21,804 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 18:33:21,804 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 18:33:21,804 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 18:33:21,805 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 18:33:21,805 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 18:33:21,805 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 18:33:21,805 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 18:33:21,805 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 18:33:21,806 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 18:33:21,806 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 18:33:21,806 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 18:33:21,806 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 18:33:21,806 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 18:33:21,807 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 18:33:21,807 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 18:33:21,807 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 18:33:21,807 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 18:33:21,807 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 18:33:21,808 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 18:33:21,808 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 18:33:21,808 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 18:33:22,107 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 18:33:22,121 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 18:33:22,125 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 18:33:22,126 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 18:33:22,127 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 18:33:22,127 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-08-22 18:33:22,196 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/161126112/cdcf218938b94519a380009ffa869465/FLAG0b7e9cdc2 [2020-08-22 18:33:22,661 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 18:33:22,662 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-08-22 18:33:22,668 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/161126112/cdcf218938b94519a380009ffa869465/FLAG0b7e9cdc2 [2020-08-22 18:33:23,082 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/161126112/cdcf218938b94519a380009ffa869465 [2020-08-22 18:33:23,089 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 18:33:23,091 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 18:33:23,092 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 18:33:23,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 18:33:23,095 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 18:33:23,096 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,099 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61445f01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23, skipping insertion in model container [2020-08-22 18:33:23,099 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,106 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 18:33:23,124 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 18:33:23,333 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:33:23,337 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 18:33:23,351 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:33:23,361 INFO L208 MainTranslator]: Completed translation [2020-08-22 18:33:23,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23 WrapperNode [2020-08-22 18:33:23,362 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 18:33:23,362 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 18:33:23,362 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 18:33:23,363 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 18:33:23,372 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,372 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,465 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,465 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,471 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,477 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,478 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (1/1) ... [2020-08-22 18:33:23,480 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 18:33:23,482 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 18:33:23,482 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 18:33:23,482 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 18:33:23,483 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (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 [2020-08-22 18:33:23,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 18:33:23,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 18:33:23,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-08-22 18:33:23,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 18:33:23,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 18:33:23,785 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 18:33:23,785 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 18:33:23,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:33:23 BoogieIcfgContainer [2020-08-22 18:33:23,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 18:33:23,805 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 18:33:23,805 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 18:33:23,808 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 18:33:23,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:33:23" (1/3) ... [2020-08-22 18:33:23,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa3105 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:33:23, skipping insertion in model container [2020-08-22 18:33:23,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:33:23" (2/3) ... [2020-08-22 18:33:23,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa3105 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:33:23, skipping insertion in model container [2020-08-22 18:33:23,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:33:23" (3/3) ... [2020-08-22 18:33:23,822 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-08-22 18:33:23,836 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 18:33:23,843 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 18:33:23,855 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 18:33:23,875 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 18:33:23,876 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 18:33:23,876 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 18:33:23,876 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 18:33:23,876 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 18:33:23,876 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 18:33:23,877 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 18:33:23,877 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 18:33:23,890 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-08-22 18:33:23,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 18:33:23,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:33:23,902 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] [2020-08-22 18:33:23,902 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:33:23,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:33:23,908 INFO L82 PathProgramCache]: Analyzing trace with hash -852610024, now seen corresponding path program 1 times [2020-08-22 18:33:23,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:33:23,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865222622] [2020-08-22 18:33:23,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:33:23,972 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:33:24,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:33:24,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 18:33:24,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:33:24,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-22 18:33:24,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:33:24,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 18:33:24,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865222622] [2020-08-22 18:33:24,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 18:33:24,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 18:33:24,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149305822] [2020-08-22 18:33:24,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 18:33:24,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 18:33:24,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 18:33:24,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 18:33:24,159 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 5 states. [2020-08-22 18:33:24,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 18:33:24,315 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2020-08-22 18:33:24,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 18:33:24,317 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-22 18:33:24,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 18:33:24,329 INFO L225 Difference]: With dead ends: 88 [2020-08-22 18:33:24,330 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 18:33:24,334 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 [2020-08-22 18:33:24,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 18:33:24,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 18:33:24,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 18:33:24,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2020-08-22 18:33:24,383 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 24 [2020-08-22 18:33:24,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 18:33:24,384 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2020-08-22 18:33:24,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 18:33:24,384 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2020-08-22 18:33:24,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 18:33:24,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:33:24,387 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] [2020-08-22 18:33:24,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 18:33:24,388 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:33:24,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:33:24,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1574290279, now seen corresponding path program 1 times [2020-08-22 18:33:24,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:33:24,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774847404] [2020-08-22 18:33:24,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:33:24,523 INFO L278 leratedInterpolation]: Starting analysis with loop acceleration approximation PRECISE [2020-08-22 18:33:24,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:33:24,548 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:33:24,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:33:24,567 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:33:24,586 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 18:33:24,586 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 18:33:24,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 18:33:24,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:33:24 BoogieIcfgContainer [2020-08-22 18:33:24,603 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 18:33:24,605 INFO L168 Benchmark]: Toolchain (without parser) took 1513.53 ms. Allocated memory was 143.1 MB in the beginning and 199.2 MB in the end (delta: 56.1 MB). Free memory was 100.5 MB in the beginning and 113.3 MB in the end (delta: -12.8 MB). Peak memory consumption was 43.3 MB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,606 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 143.1 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,609 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.18 ms. Allocated memory is still 143.1 MB. Free memory was 100.3 MB in the beginning and 90.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,610 INFO L168 Benchmark]: Boogie Preprocessor took 119.43 ms. Allocated memory was 143.1 MB in the beginning and 199.2 MB in the end (delta: 56.1 MB). Free memory was 90.8 MB in the beginning and 177.0 MB in the end (delta: -86.2 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,611 INFO L168 Benchmark]: RCFGBuilder took 307.41 ms. Allocated memory is still 199.2 MB. Free memory was 177.0 MB in the beginning and 162.6 MB in the end (delta: 14.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,613 INFO L168 Benchmark]: TraceAbstraction took 797.79 ms. Allocated memory is still 199.2 MB. Free memory was 161.9 MB in the beginning and 113.3 MB in the end (delta: 48.6 MB). Peak memory consumption was 48.6 MB. Max. memory is 7.1 GB. [2020-08-22 18:33:24,624 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 143.1 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.18 ms. Allocated memory is still 143.1 MB. Free memory was 100.3 MB in the beginning and 90.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.43 ms. Allocated memory was 143.1 MB in the beginning and 199.2 MB in the end (delta: 56.1 MB). Free memory was 90.8 MB in the beginning and 177.0 MB in the end (delta: -86.2 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 307.41 ms. Allocated memory is still 199.2 MB. Free memory was 177.0 MB in the beginning and 162.6 MB in the end (delta: 14.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 797.79 ms. Allocated memory is still 199.2 MB. Free memory was 161.9 MB in the beginning and 113.3 MB in the end (delta: 48.6 MB). Peak memory consumption was 48.6 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) [L39] CALL, EXPR ackermann(m,n) [L15] COND FALSE !(m==0) [L18] COND TRUE n==0 [L19] CALL, EXPR ackermann(m-1,1) [L15] COND TRUE m==0 [L16] return n+1; [L19] RET, EXPR ackermann(m-1,1) [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) [L43] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 49 SDtfs, 24 SDslu, 107 SDs, 0 SdLazy, 40 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=1, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...