/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-21 18:55:40,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:55:40,253 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:55:40,278 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:55:40,278 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:55:40,279 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:55:40,280 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:55:40,282 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:55:40,284 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:55:40,285 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:55:40,286 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:55:40,287 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:55:40,287 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:55:40,288 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:55:40,289 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:55:40,290 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:55:40,291 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:55:40,292 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:55:40,293 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:55:40,295 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:55:40,297 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:55:40,298 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:55:40,299 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:55:40,300 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:55:40,302 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:55:40,302 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:55:40,303 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:55:40,303 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:55:40,304 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:55:40,305 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:55:40,305 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:55:40,306 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:55:40,306 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:55:40,307 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:55:40,308 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:55:40,309 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:55:40,309 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:55:40,310 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:55:40,310 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:55:40,311 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:55:40,311 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:55:40,312 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:55:40,360 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:55:40,363 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:55:40,364 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:55:40,364 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:55:40,365 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:55:40,365 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:55:40,365 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:55:40,365 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:55:40,365 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:55:40,369 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:55:40,369 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:55:40,369 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:55:40,369 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:55:40,370 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:55:40,370 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:55:40,370 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:55:40,370 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:55:40,370 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:55:40,371 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:55:40,371 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:55:40,371 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:55:40,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:55:40,372 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:55:40,372 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:55:40,372 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:55:40,372 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:55:40,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:55:40,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:55:40,377 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:55:40,377 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:55:40,715 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:55:40,726 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:55:40,730 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:55:40,731 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:55:40,732 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:55:40,732 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-21 18:55:40,808 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7337fd43c/95be242b58354738bd896251c7b830ac/FLAG03acbbdfc [2020-08-21 18:55:41,230 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:55:41,230 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-21 18:55:41,238 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7337fd43c/95be242b58354738bd896251c7b830ac/FLAG03acbbdfc [2020-08-21 18:55:41,617 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7337fd43c/95be242b58354738bd896251c7b830ac [2020-08-21 18:55:41,627 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:55:41,630 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:55:41,631 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:55:41,631 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:55:41,635 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:55:41,636 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:41,640 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c77fbdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41, skipping insertion in model container [2020-08-21 18:55:41,640 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:41,649 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:55:41,666 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:55:41,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:55:41,897 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:55:41,918 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:55:41,936 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:55:41,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41 WrapperNode [2020-08-21 18:55:41,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:55:41,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:55:41,938 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:55:41,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:55:41,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:41,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:41,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:41,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:42,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:42,066 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:42,070 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... [2020-08-21 18:55:42,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:55:42,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:55:42,074 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:55:42,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:55:42,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 18:55:42,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:55:42,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:55:42,145 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-08-21 18:55:42,145 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-08-21 18:55:42,146 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:55:42,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:55:42,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:55:42,146 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-08-21 18:55:42,146 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-08-21 18:55:42,146 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:55:42,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:55:42,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:55:42,339 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:55:42,340 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:55:42,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:55:42 BoogieIcfgContainer [2020-08-21 18:55:42,344 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:55:42,345 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:55:42,345 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:55:42,348 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:55:42,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:55:41" (1/3) ... [2020-08-21 18:55:42,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73795d2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:55:42, skipping insertion in model container [2020-08-21 18:55:42,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:55:41" (2/3) ... [2020-08-21 18:55:42,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73795d2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:55:42, skipping insertion in model container [2020-08-21 18:55:42,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:55:42" (3/3) ... [2020-08-21 18:55:42,352 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-08-21 18:55:42,363 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:55:42,371 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:55:42,388 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:55:42,425 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:55:42,429 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:55:42,429 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:55:42,429 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:55:42,430 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:55:42,430 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:55:42,430 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:55:42,430 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:55:42,478 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 18:55:42,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:55:42,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:55:42,492 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:55:42,492 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:55:42,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:55:42,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-08-21 18:55:42,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:55:42,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403760400] [2020-08-21 18:55:42,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:55:42,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:55:42,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:55:42,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:55:42,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [403760400] [2020-08-21 18:55:42,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:55:42,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:55:42,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732940471] [2020-08-21 18:55:42,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:55:42,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:55:42,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:55:42,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:55:42,744 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-08-21 18:55:42,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:55:42,841 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-08-21 18:55:42,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:55:42,843 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:55:42,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:55:42,854 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:55:42,854 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:55:42,858 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 [2020-08-21 18:55:42,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:55:42,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 18:55:42,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:55:42,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-08-21 18:55:42,903 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-08-21 18:55:42,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:55:42,904 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-08-21 18:55:42,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:55:42,904 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-08-21 18:55:42,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 18:55:42,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:55:42,906 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:55:42,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:55:42,907 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:55:42,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:55:42,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-08-21 18:55:42,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:55:42,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459927298] [2020-08-21 18:55:42,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:55:42,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:55:42,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:55:42,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:42,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:55:42,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459927298] [2020-08-21 18:55:42,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:55:42,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:55:42,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762190295] [2020-08-21 18:55:42,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:55:42,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:55:42,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:55:42,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:55:42,975 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-08-21 18:55:43,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:55:43,067 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 18:55:43,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:55:43,069 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 18:55:43,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:55:43,070 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:55:43,071 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:55:43,073 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 [2020-08-21 18:55:43,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:55:43,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-08-21 18:55:43,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:55:43,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-08-21 18:55:43,093 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-08-21 18:55:43,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:55:43,094 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-08-21 18:55:43,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:55:43,094 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-08-21 18:55:43,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:55:43,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:55:43,098 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] [2020-08-21 18:55:43,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:55:43,099 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:55:43,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:55:43,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-08-21 18:55:43,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:55:43,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739881325] [2020-08-21 18:55:43,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:55:43,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:43,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:55:43,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:43,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:55:43,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:43,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:55:43,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:43,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 18:55:43,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:55:43,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:55:43,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739881325] [2020-08-21 18:55:43,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:55:43,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:55:43,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391428834] [2020-08-21 18:55:43,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:55:43,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:55:43,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:55:43,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:55:43,286 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2020-08-21 18:55:43,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:55:43,372 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-08-21 18:55:43,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:55:43,373 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-08-21 18:55:43,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:55:43,374 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:55:43,375 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:55:43,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:55:43,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:55:43,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-21 18:55:43,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 18:55:43,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-08-21 18:55:43,386 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-08-21 18:55:43,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:55:43,387 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-08-21 18:55:43,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:55:43,387 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-08-21 18:55:43,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 18:55:43,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:55:43,389 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] [2020-08-21 18:55:43,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:55:43,390 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:55:43,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:55:43,391 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-08-21 18:55:43,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:55:43,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176968929] [2020-08-21 18:55:43,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:55:43,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:55:43,408 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:55:43,408 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:55:43,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:55:43,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:55:43 BoogieIcfgContainer [2020-08-21 18:55:43,432 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:55:43,435 INFO L168 Benchmark]: Toolchain (without parser) took 1803.68 ms. Allocated memory was 149.4 MB in the beginning and 202.9 MB in the end (delta: 53.5 MB). Free memory was 106.1 MB in the beginning and 103.3 MB in the end (delta: 2.8 MB). Peak memory consumption was 56.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,436 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 149.4 MB. Free memory was 123.9 MB in the beginning and 123.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,437 INFO L168 Benchmark]: CACSL2BoogieTranslator took 306.00 ms. Allocated memory is still 149.4 MB. Free memory was 105.9 MB in the beginning and 96.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,438 INFO L168 Benchmark]: Boogie Preprocessor took 134.77 ms. Allocated memory was 149.4 MB in the beginning and 202.9 MB in the end (delta: 53.5 MB). Free memory was 96.2 MB in the beginning and 181.8 MB in the end (delta: -85.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,439 INFO L168 Benchmark]: RCFGBuilder took 271.62 ms. Allocated memory is still 202.9 MB. Free memory was 181.8 MB in the beginning and 168.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,440 INFO L168 Benchmark]: TraceAbstraction took 1086.50 ms. Allocated memory is still 202.9 MB. Free memory was 168.2 MB in the beginning and 103.3 MB in the end (delta: 64.9 MB). Peak memory consumption was 64.9 MB. Max. memory is 7.1 GB. [2020-08-21 18:55:43,444 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 149.4 MB. Free memory was 123.9 MB in the beginning and 123.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 306.00 ms. Allocated memory is still 149.4 MB. Free memory was 105.9 MB in the beginning and 96.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 134.77 ms. Allocated memory was 149.4 MB in the beginning and 202.9 MB in the end (delta: 53.5 MB). Free memory was 96.2 MB in the beginning and 181.8 MB in the end (delta: -85.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 271.62 ms. Allocated memory is still 202.9 MB. Free memory was 181.8 MB in the beginning and 168.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1086.50 ms. Allocated memory is still 202.9 MB. Free memory was 168.2 MB in the beginning and 103.3 MB in the end (delta: 64.9 MB). Peak memory consumption was 64.9 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; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 1 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 91 SDtfs, 43 SDslu, 232 SDs, 0 SdLazy, 107 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=0, 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, 0.2s InterpolantComputationTime, 80 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 50 ConstructedInterpolants, 0 QuantifiedInterpolants, 1464 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 1/4 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...