/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 BIGGEST_EQUIVALENCE_CLASS --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-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:17:17,522 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:17:17,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:17:17,539 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:17:17,539 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:17:17,541 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:17:17,542 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:17:17,545 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:17:17,547 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:17:17,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:17:17,549 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:17:17,551 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:17:17,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:17:17,553 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:17:17,554 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:17:17,556 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:17:17,557 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:17:17,558 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:17:17,560 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:17:17,563 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:17:17,568 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:17:17,569 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:17:17,571 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:17:17,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:17:17,581 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:17:17,601 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:17:17,605 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:17:17,606 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:17:17,607 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 [2020-07-21 22:17:17,623 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:17:17,623 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:17:17,625 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:17:17,625 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:17:17,625 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:17:17,625 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:17:17,626 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:17:17,627 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:17:17,627 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:17:17,627 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:17:17,627 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:17:17,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:17:17,628 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:17:17,628 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:17:17,628 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:17:17,628 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:17:17,628 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:17:17,629 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:17:17,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:17:17,632 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:17:17,632 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:17:17,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:17:17,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:17:17,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:17:17,633 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:17:17,934 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:17:17,949 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:17:17,954 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:17:17,956 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:17:17,956 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:17:17,957 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 22:17:18,037 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52ec716e4/9905cdde77c6473897b1a77b28a3b219/FLAG044515e2f [2020-07-21 22:17:18,536 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:17:18,537 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 22:17:18,549 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52ec716e4/9905cdde77c6473897b1a77b28a3b219/FLAG044515e2f [2020-07-21 22:17:18,888 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52ec716e4/9905cdde77c6473897b1a77b28a3b219 [2020-07-21 22:17:18,901 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:17:18,905 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:17:18,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:17:18,907 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:17:18,911 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:17:18,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:17:18" (1/1) ... [2020-07-21 22:17:18,916 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1649d608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:18, skipping insertion in model container [2020-07-21 22:17:18,917 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:17:18" (1/1) ... [2020-07-21 22:17:18,926 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:17:18,948 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:17:19,142 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:17:19,148 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:17:19,169 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:17:19,187 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:17:19,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19 WrapperNode [2020-07-21 22:17:19,188 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:17:19,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:17:19,189 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:17:19,189 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:17:19,201 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,201 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,207 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,207 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,294 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,298 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (1/1) ... [2020-07-21 22:17:19,300 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:17:19,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:17:19,301 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:17:19,301 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:17:19,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (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 [2020-07-21 22:17:19,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:17:19,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:17:19,385 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 22:17:19,385 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 22:17:19,386 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:17:19,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:17:19,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:17:19,386 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 22:17:19,386 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 22:17:19,386 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:17:19,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:17:19,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:17:19,618 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:17:19,619 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:17:19,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:17:19 BoogieIcfgContainer [2020-07-21 22:17:19,627 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:17:19,629 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:17:19,629 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:17:19,641 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:17:19,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:17:18" (1/3) ... [2020-07-21 22:17:19,643 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ef8006 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:17:19, skipping insertion in model container [2020-07-21 22:17:19,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:17:19" (2/3) ... [2020-07-21 22:17:19,647 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ef8006 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:17:19, skipping insertion in model container [2020-07-21 22:17:19,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:17:19" (3/3) ... [2020-07-21 22:17:19,652 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-07-21 22:17:19,680 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:17:19,698 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:17:19,731 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:17:19,770 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:17:19,771 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:17:19,771 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:17:19,771 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:17:19,772 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:17:19,772 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:17:19,772 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:17:19,772 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:17:19,800 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 22:17:19,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:17:19,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:17:19,813 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:17:19,814 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:17:19,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:17:19,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 22:17:19,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:17:19,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135761018] [2020-07-21 22:17:19,831 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 [2020-07-21 22:17:19,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:17:19,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:17:19,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:17:19,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:17:20,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:17:20,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:17:20,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135761018] [2020-07-21 22:17:20,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:17:20,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:17:20,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26791596] [2020-07-21 22:17:20,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:17:20,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:17:20,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:17:20,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:17:20,041 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 22:17:20,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:17:20,176 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 22:17:20,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:17:20,178 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:17:20,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:17:20,191 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:17:20,191 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:17:20,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:17:20,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:17:20,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:17:20,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:17:20,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:17:20,256 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 22:17:20,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:17:20,257 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:17:20,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:17:20,257 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:17:20,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:17:20,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:17:20,260 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:17:20,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:17:20,477 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:17:20,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:17:20,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 22:17:20,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:17:20,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003666986] [2020-07-21 22:17:20,480 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 [2020-07-21 22:17:20,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:17:20,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:17:20,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:17:20,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:17:20,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:17:20,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:17:20,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003666986] [2020-07-21 22:17:20,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:17:20,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:17:20,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620388431] [2020-07-21 22:17:20,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:17:20,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:17:20,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:17:20,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:17:20,583 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 22:17:20,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:17:20,691 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 22:17:20,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:17:20,692 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:17:20,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:17:20,694 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:17:20,695 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:17:20,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:17:20,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:17:20,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:17:20,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:17:20,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:17:20,708 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 22:17:20,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:17:20,708 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:17:20,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:17:20,709 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:17:20,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:17:20,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:17:20,711 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] [2020-07-21 22:17:20,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:17:20,917 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:17:20,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:17:20,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 22:17:20,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:17:20,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437653758] [2020-07-21 22:17:20,920 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 [2020-07-21 22:17:20,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:17:20,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:17:20,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:17:20,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:17:21,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:17:21,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:17:21,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:21,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:21,361 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:17:21,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437653758] [2020-07-21 22:17:21,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:17:21,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 22:17:21,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642560481] [2020-07-21 22:17:21,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:17:21,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:17:21,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:17:21,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:17:21,384 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 9 states. [2020-07-21 22:17:21,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:17:21,537 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 22:17:21,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:17:21,539 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:17:21,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:17:21,541 INFO L225 Difference]: With dead ends: 41 [2020-07-21 22:17:21,541 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 22:17:21,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:17:21,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 22:17:21,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 22:17:21,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:17:21,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:17:21,553 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 22:17:21,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:17:21,554 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:17:21,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:17:21,554 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:17:21,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:17:21,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:17:21,556 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:17:21,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:17:21,769 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:17:21,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:17:21,770 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 22:17:21,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:17:21,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567983373] [2020-07-21 22:17:21,772 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 [2020-07-21 22:17:21,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:17:21,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:17:21,807 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:17:21,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:17:21,817 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:17:21,835 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:17:21,835 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:17:22,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:17:22,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:17:22 BoogieIcfgContainer [2020-07-21 22:17:22,083 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:17:22,086 INFO L168 Benchmark]: Toolchain (without parser) took 3181.92 ms. Allocated memory was 137.9 MB in the beginning and 234.4 MB in the end (delta: 96.5 MB). Free memory was 101.2 MB in the beginning and 181.6 MB in the end (delta: -80.4 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,088 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,089 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.70 ms. Allocated memory is still 137.9 MB. Free memory was 100.8 MB in the beginning and 90.8 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,090 INFO L168 Benchmark]: Boogie Preprocessor took 111.59 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 90.8 MB in the beginning and 181.1 MB in the end (delta: -90.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,093 INFO L168 Benchmark]: RCFGBuilder took 326.90 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 167.2 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,094 INFO L168 Benchmark]: TraceAbstraction took 2453.99 ms. Allocated memory was 201.9 MB in the beginning and 234.4 MB in the end (delta: 32.5 MB). Free memory was 167.2 MB in the beginning and 181.6 MB in the end (delta: -14.4 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. [2020-07-21 22:17:22,101 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.70 ms. Allocated memory is still 137.9 MB. Free memory was 100.8 MB in the beginning and 90.8 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.59 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 90.8 MB in the beginning and 181.1 MB in the end (delta: -90.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 326.90 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 167.2 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2453.99 ms. Allocated memory was 201.9 MB in the beginning and 234.4 MB in the end (delta: 32.5 MB). Free memory was 167.2 MB in the beginning and 181.6 MB in the end (delta: -14.4 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; VAL [x=2] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L37] int result = fibo1(x); [L38] COND TRUE result == 1 VAL [result=1, x=2] [L39] __VERIFIER_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.2s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 80 SDtfs, 51 SDslu, 203 SDs, 0 SdLazy, 129 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 80 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred 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, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 80 NumberOfCodeBlocks, 61 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 75 ConstructedInterpolants, 0 QuantifiedInterpolants, 3389 SizeOfPredicates, 7 NumberOfNonLiveVariables, 83 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 4 InterpolantComputations, 2 PerfectInterpolantSequences, 2/8 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...