/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -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-d623d84 [2020-07-20 16:28:14,343 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:28:14,347 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:28:14,364 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:28:14,365 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:28:14,367 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:28:14,369 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:28:14,379 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:28:14,381 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:28:14,382 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:28:14,385 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:28:14,386 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:28:14,386 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:28:14,390 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:28:14,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:28:14,394 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:28:14,396 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:28:14,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:28:14,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:28:14,406 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:28:14,411 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:28:14,414 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:28:14,415 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:28:14,416 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:28:14,418 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:28:14,430 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:28:14,431 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:28:14,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:28:14,434 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 [2020-07-20 16:28:14,469 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:28:14,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:28:14,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:28:14,472 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:28:14,472 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:28:14,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:28:14,472 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:28:14,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:28:14,473 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:28:14,473 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:28:14,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:28:14,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:28:14,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:28:14,476 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:28:14,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:28:14,477 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:28:14,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:28:14,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:28:14,477 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:28:14,477 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:28:14,477 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:28:14,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:28:14,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:28:14,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:28:14,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:28:14,478 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:28:14,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:14,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:28:14,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:28:14,480 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:28:14,759 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:28:14,780 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:28:14,784 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:28:14,786 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:28:14,786 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:28:14,788 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-20 16:28:14,865 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6bef0e100/a98dc119d1dd454590629ae040782fef/FLAGa5fa85267 [2020-07-20 16:28:15,349 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:28:15,350 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-20 16:28:15,359 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6bef0e100/a98dc119d1dd454590629ae040782fef/FLAGa5fa85267 [2020-07-20 16:28:15,708 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6bef0e100/a98dc119d1dd454590629ae040782fef [2020-07-20 16:28:15,717 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:28:15,720 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:28:15,721 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:15,721 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:28:15,725 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:28:15,726 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,729 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b8f7a24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15, skipping insertion in model container [2020-07-20 16:28:15,729 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,737 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:28:15,756 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:28:15,920 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:15,924 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:28:15,942 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:15,957 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:28:15,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15 WrapperNode [2020-07-20 16:28:15,958 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:15,959 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:28:15,959 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:28:15,959 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:28:15,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,973 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,978 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,983 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,985 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,986 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (1/1) ... [2020-07-20 16:28:15,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:28:15,988 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:28:15,988 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:28:15,988 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:28:15,989 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (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 [2020-07-20 16:28:16,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:28:16,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:28:16,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-20 16:28:16,140 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:28:16,140 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:28:16,140 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:28:16,141 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-20 16:28:16,141 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:28:16,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:28:16,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:28:16,336 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:28:16,337 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:28:16,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:16 BoogieIcfgContainer [2020-07-20 16:28:16,341 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:28:16,342 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:28:16,342 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:28:16,346 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:28:16,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:28:15" (1/3) ... [2020-07-20 16:28:16,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d514ebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:16, skipping insertion in model container [2020-07-20 16:28:16,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:15" (2/3) ... [2020-07-20 16:28:16,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d514ebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:16, skipping insertion in model container [2020-07-20 16:28:16,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:16" (3/3) ... [2020-07-20 16:28:16,350 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-07-20 16:28:16,361 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:28:16,369 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:28:16,384 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:28:16,416 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:28:16,417 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:28:16,417 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:28:16,417 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:28:16,418 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:28:16,418 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:28:16,418 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:28:16,419 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:28:16,449 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 16:28:16,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 16:28:16,459 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:16,461 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:16,461 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:16,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:16,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-20 16:28:16,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:16,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888196726] [2020-07-20 16:28:16,481 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:16,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:16,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:16,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:28:16,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:16,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:28:16,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888196726] [2020-07-20 16:28:16,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:28:16,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:28:16,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654644520] [2020-07-20 16:28:16,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:28:16,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:16,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:28:16,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:28:16,668 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-20 16:28:16,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:16,814 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2020-07-20 16:28:16,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:28:16,817 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-20 16:28:16,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:16,829 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:28:16,829 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:28:16,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:28:16,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:28:16,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 16:28:16,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 16:28:16,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-20 16:28:16,885 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-20 16:28:16,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:16,886 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-20 16:28:16,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:28:16,887 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-20 16:28:16,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 16:28:16,890 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:16,890 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] [2020-07-20 16:28:17,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:17,107 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:17,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:17,108 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-20 16:28:17,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:17,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184117211] [2020-07-20 16:28:17,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:17,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:17,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:17,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:28:17,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:17,204 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:28:17,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:17,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:17,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:17,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:28:17,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184117211] [2020-07-20 16:28:17,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:17,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-20 16:28:17,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222365044] [2020-07-20 16:28:17,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 16:28:17,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:17,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 16:28:17,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:28:17,451 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-20 16:28:17,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:17,575 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-07-20 16:28:17,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:28:17,576 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 16:28:17,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:17,579 INFO L225 Difference]: With dead ends: 38 [2020-07-20 16:28:17,579 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 16:28:17,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:28:17,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 16:28:17,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 16:28:17,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 16:28:17,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-07-20 16:28:17,604 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 22 [2020-07-20 16:28:17,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:17,604 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-07-20 16:28:17,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 16:28:17,604 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-07-20 16:28:17,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 16:28:17,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:17,607 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] [2020-07-20 16:28:17,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:17,821 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:17,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:17,821 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-20 16:28:17,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:17,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916540551] [2020-07-20 16:28:17,822 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:17,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:17,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:17,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 16:28:17,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:17,883 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:28:17,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:17,957 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:28:17,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916540551] [2020-07-20 16:28:17,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:17,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-07-20 16:28:17,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424510963] [2020-07-20 16:28:17,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:28:17,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:17,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:28:17,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:28:17,960 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 5 states. [2020-07-20 16:28:18,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:18,024 INFO L93 Difference]: Finished difference Result 64 states and 116 transitions. [2020-07-20 16:28:18,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 16:28:18,025 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2020-07-20 16:28:18,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:18,028 INFO L225 Difference]: With dead ends: 64 [2020-07-20 16:28:18,028 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:28:18,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:28:18,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:28:18,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-20 16:28:18,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 16:28:18,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 59 transitions. [2020-07-20 16:28:18,059 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 59 transitions. Word has length 29 [2020-07-20 16:28:18,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:18,062 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 59 transitions. [2020-07-20 16:28:18,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:28:18,063 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 59 transitions. [2020-07-20 16:28:18,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 16:28:18,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:18,068 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] [2020-07-20 16:28:18,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,273 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:18,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:18,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-07-20 16:28:18,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:18,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915151173] [2020-07-20 16:28:18,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:18,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:28:18,326 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:28:18,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:28:18,338 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:28:18,356 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:28:18,356 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:28:18,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:28:18 BoogieIcfgContainer [2020-07-20 16:28:18,601 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:28:18,604 INFO L168 Benchmark]: Toolchain (without parser) took 2884.50 ms. Allocated memory was 146.3 MB in the beginning and 234.4 MB in the end (delta: 88.1 MB). Free memory was 104.1 MB in the beginning and 161.6 MB in the end (delta: -57.5 MB). Peak memory consumption was 30.6 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:18,604 INFO L168 Benchmark]: CDTParser took 0.60 ms. Allocated memory is still 146.3 MB. Free memory is still 122.1 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 16:28:18,605 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.05 ms. Allocated memory is still 146.3 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:18,606 INFO L168 Benchmark]: Boogie Preprocessor took 29.26 ms. Allocated memory is still 146.3 MB. Free memory was 94.1 MB in the beginning and 92.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:18,607 INFO L168 Benchmark]: RCFGBuilder took 352.96 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 92.4 MB in the beginning and 169.7 MB in the end (delta: -77.3 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:18,608 INFO L168 Benchmark]: TraceAbstraction took 2258.94 ms. Allocated memory was 203.4 MB in the beginning and 234.4 MB in the end (delta: 30.9 MB). Free memory was 169.7 MB in the beginning and 161.6 MB in the end (delta: 8.2 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:18,612 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.60 ms. Allocated memory is still 146.3 MB. Free memory is still 122.1 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 237.05 ms. Allocated memory is still 146.3 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.26 ms. Allocated memory is still 146.3 MB. Free memory was 94.1 MB in the beginning and 92.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 352.96 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 92.4 MB in the beginning and 169.7 MB in the end (delta: -77.3 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2258.94 ms. Allocated memory was 203.4 MB in the beginning and 234.4 MB in the end (delta: 30.9 MB). Free memory was 169.7 MB in the beginning and 161.6 MB in the end (delta: 8.2 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) VAL [m=2, n=0] [L39] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L18] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L18] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L21] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L18] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L43] __VERIFIER_error() VAL [m=2, n=0, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 71 SDtfs, 52 SDslu, 142 SDs, 0 SdLazy, 114 SolverSat, 37 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 119 GetRequests, 96 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 108 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4942 SizeOfPredicates, 7 NumberOfNonLiveVariables, 170 ConjunctsInSsa, 13 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 31/38 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...