/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:18:23,071 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:18:23,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:18:23,116 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:18:23,116 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:18:23,121 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:18:23,123 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:18:23,128 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:18:23,133 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:18:23,135 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:18:23,137 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:18:23,139 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:18:23,139 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:18:23,143 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:18:23,146 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:18:23,148 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:18:23,149 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:18:23,151 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:18:23,152 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:18:23,161 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:18:23,163 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:18:23,164 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:18:23,165 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:18:23,166 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:18:23,169 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 16:18:23,169 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 16:18:23,169 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 16:18:23,172 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 16:18:23,173 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 16:18:23,184 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 16:18:23,184 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 16:18:23,185 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 16:18:23,186 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 16:18:23,186 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 16:18:23,187 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 16:18:23,188 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 16:18:23,188 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 16:18:23,188 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 16:18:23,189 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 16:18:23,190 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 16:18:23,190 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 16:18:23,191 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 [2020-08-22 16:18:23,214 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:18:23,214 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:18:23,215 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:18:23,216 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:18:23,216 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:18:23,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:18:23,216 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:18:23,217 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:18:23,218 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:18:23,218 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:18:23,218 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:18:23,218 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:18:23,218 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:18:23,219 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:18:23,219 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:18:23,219 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:18:23,219 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:18:23,219 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:18:23,220 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:18:23,220 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:18:23,220 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:18:23,220 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:18:23,220 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:18:23,221 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:18:23,221 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:18:23,523 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:18:23,542 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:18:23,552 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:18:23,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:18:23,555 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:18:23,556 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-08-22 16:18:23,637 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcf43ea65/f2f3c2e068d645e88a8362ab35bf5503/FLAG8f60d2a03 [2020-08-22 16:18:24,068 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:18:24,069 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-08-22 16:18:24,075 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcf43ea65/f2f3c2e068d645e88a8362ab35bf5503/FLAG8f60d2a03 [2020-08-22 16:18:24,446 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dcf43ea65/f2f3c2e068d645e88a8362ab35bf5503 [2020-08-22 16:18:24,456 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:18:24,458 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:18:24,460 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:18:24,460 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:18:24,464 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:18:24,465 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,468 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e751fdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24, skipping insertion in model container [2020-08-22 16:18:24,468 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,477 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:18:24,499 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:18:24,661 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:18:24,666 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:18:24,683 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:18:24,694 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:18:24,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24 WrapperNode [2020-08-22 16:18:24,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:18:24,696 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:18:24,696 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:18:24,696 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:18:24,705 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,706 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,711 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,711 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,715 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,717 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (1/1) ... [2020-08-22 16:18:24,720 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:18:24,720 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:18:24,721 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:18:24,721 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:18:24,722 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (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 16:18:24,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:18:24,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:18:24,867 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-08-22 16:18:24,867 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:18:24,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:18:24,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 16:18:24,867 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-08-22 16:18:24,867 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:18:24,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:18:24,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:18:25,064 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:18:25,065 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 16:18:25,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:18:25 BoogieIcfgContainer [2020-08-22 16:18:25,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:18:25,070 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:18:25,070 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:18:25,073 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:18:25,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:18:24" (1/3) ... [2020-08-22 16:18:25,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410977a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:18:25, skipping insertion in model container [2020-08-22 16:18:25,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:18:24" (2/3) ... [2020-08-22 16:18:25,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410977a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:18:25, skipping insertion in model container [2020-08-22 16:18:25,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:18:25" (3/3) ... [2020-08-22 16:18:25,077 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-08-22 16:18:25,088 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:18:25,096 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:18:25,112 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:18:25,138 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:18:25,138 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:18:25,138 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:18:25,139 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:18:25,139 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:18:25,139 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:18:25,139 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:18:25,139 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:18:25,168 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-22 16:18:25,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 16:18:25,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:25,180 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:25,180 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:25,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:25,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-08-22 16:18:25,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:25,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239946606] [2020-08-22 16:18:25,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:25,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:25,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,436 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 16:18:25,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239946606] [2020-08-22 16:18:25,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:18:25,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 16:18:25,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122295999] [2020-08-22 16:18:25,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:18:25,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:25,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:18:25,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:18:25,458 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-08-22 16:18:25,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:25,618 INFO L93 Difference]: Finished difference Result 55 states and 77 transitions. [2020-08-22 16:18:25,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:18:25,620 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-22 16:18:25,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:25,632 INFO L225 Difference]: With dead ends: 55 [2020-08-22 16:18:25,633 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 16:18:25,637 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 16:18:25,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 16:18:25,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 16:18:25,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 16:18:25,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-08-22 16:18:25,682 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2020-08-22 16:18:25,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:25,683 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-08-22 16:18:25,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:18:25,683 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-08-22 16:18:25,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 16:18:25,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:25,687 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:25,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:18:25,687 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:25,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:25,688 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-08-22 16:18:25,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:25,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831035031] [2020-08-22 16:18:25,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:25,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:25,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:25,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:25,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,816 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:18:25,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831035031] [2020-08-22 16:18:25,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905165166] [2020-08-22 16:18:25,817 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 [2020-08-22 16:18:25,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:25,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:18:25,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:26,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:18:26,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:26,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-08-22 16:18:26,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773556280] [2020-08-22 16:18:26,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:18:26,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:26,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:18:26,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:18:26,068 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 8 states. [2020-08-22 16:18:26,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:26,270 INFO L93 Difference]: Finished difference Result 60 states and 94 transitions. [2020-08-22 16:18:26,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:18:26,272 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-08-22 16:18:26,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:26,274 INFO L225 Difference]: With dead ends: 60 [2020-08-22 16:18:26,275 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 16:18:26,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:18:26,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 16:18:26,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 16:18:26,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 16:18:26,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-22 16:18:26,294 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2020-08-22 16:18:26,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:26,295 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-22 16:18:26,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:18:26,295 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-22 16:18:26,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 16:18:26,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:26,297 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:26,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:18:26,509 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:26,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:26,510 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-08-22 16:18:26,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:26,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853537437] [2020-08-22 16:18:26,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:26,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:18:26,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 16:18:26,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:26,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 16:18:26,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:18:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 16:18:26,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853537437] [2020-08-22 16:18:26,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214865433] [2020-08-22 16:18:26,638 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 [2020-08-22 16:18:26,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:18:26,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:18:26,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-08-22 16:18:26,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:18:26,743 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 16:18:26,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:18:26,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-08-22 16:18:26,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570129906] [2020-08-22 16:18:26,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:18:26,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:18:26,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:18:26,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:18:26,746 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 6 states. [2020-08-22 16:18:26,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:18:26,805 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-08-22 16:18:26,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:18:26,806 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-08-22 16:18:26,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:18:26,808 INFO L225 Difference]: With dead ends: 62 [2020-08-22 16:18:26,808 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 16:18:26,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:18:26,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 16:18:26,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 16:18:26,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 16:18:26,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2020-08-22 16:18:26,819 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 29 [2020-08-22 16:18:26,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:18:26,820 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-08-22 16:18:26,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:18:26,820 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2020-08-22 16:18:26,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 16:18:26,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:18:26,822 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:18:27,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:18:27,036 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:18:27,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:18:27,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-08-22 16:18:27,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:18:27,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120259448] [2020-08-22 16:18:27,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:18:27,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:18:27,061 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:18:27,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:18:27,101 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:18:27,128 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:18:27,129 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:18:27,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 16:18:27,169 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:18:27 BoogieIcfgContainer [2020-08-22 16:18:27,169 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:18:27,171 INFO L168 Benchmark]: Toolchain (without parser) took 2712.87 ms. Allocated memory was 138.9 MB in the beginning and 233.8 MB in the end (delta: 94.9 MB). Free memory was 102.6 MB in the beginning and 180.0 MB in the end (delta: -77.4 MB). Peak memory consumption was 17.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,172 INFO L168 Benchmark]: CDTParser took 1.45 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,173 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.50 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,174 INFO L168 Benchmark]: Boogie Preprocessor took 24.62 ms. Allocated memory is still 138.9 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,175 INFO L168 Benchmark]: RCFGBuilder took 348.53 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 91.4 MB in the beginning and 168.2 MB in the end (delta: -76.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,176 INFO L168 Benchmark]: TraceAbstraction took 2099.13 ms. Allocated memory was 201.9 MB in the beginning and 233.8 MB in the end (delta: 32.0 MB). Free memory was 168.2 MB in the beginning and 180.0 MB in the end (delta: -11.8 MB). Peak memory consumption was 20.2 MB. Max. memory is 7.1 GB. [2020-08-22 16:18:27,180 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.45 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 235.50 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.62 ms. Allocated memory is still 138.9 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 348.53 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 91.4 MB in the beginning and 168.2 MB in the end (delta: -76.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2099.13 ms. Allocated memory was 201.9 MB in the beginning and 233.8 MB in the end (delta: 32.0 MB). Free memory was 168.2 MB in the beginning and 180.0 MB in the end (delta: -11.8 MB). Peak memory consumption was 20.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) VAL [m=2, n=0] [L39] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L18] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L18] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L21] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L18] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L43] __VERIFIER_error() VAL [m=2, n=0, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 75 SDtfs, 41 SDslu, 180 SDs, 0 SdLazy, 151 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 159 NumberOfCodeBlocks, 159 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4382 SizeOfPredicates, 4 NumberOfNonLiveVariables, 152 ConjunctsInSsa, 9 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 32/38 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...