/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:11:16,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:11:16,289 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:11:16,326 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:11:16,326 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:11:16,328 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:11:16,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:11:16,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:11:16,335 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:11:16,336 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:11:16,337 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:11:16,339 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:11:16,340 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:11:16,344 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:11:16,345 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:11:16,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:11:16,353 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:11:16,355 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:11:16,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:11:16,378 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:11:16,384 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:11:16,387 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:11:16,388 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:11:16,389 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:11:16,396 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:11:16,416 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:11:16,417 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:11:16,418 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:11:16,419 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 [2020-10-23 18:11:16,475 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:11:16,475 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:11:16,479 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:11:16,480 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:11:16,480 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:11:16,480 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:11:16,481 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:11:16,481 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:11:16,481 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:11:16,481 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:11:16,482 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:11:16,483 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:11:16,483 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:11:16,483 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:11:16,483 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:11:16,484 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:11:16,484 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:11:16,484 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:11:16,484 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:11:16,484 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:11:16,485 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:11:16,485 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:11:16,485 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:11:16,485 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:11:16,485 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:11:16,486 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:11:16,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:11:16,486 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:11:16,486 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:11:16,486 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:11:16,907 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:11:16,939 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:11:16,943 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:11:16,945 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:11:16,945 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:11:16,947 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-23 18:11:17,041 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fb2e1522/d54087e0a1214c1bbab97d253d45a12f/FLAG272b31f37 [2020-10-23 18:11:17,676 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:11:17,676 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-23 18:11:17,684 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fb2e1522/d54087e0a1214c1bbab97d253d45a12f/FLAG272b31f37 [2020-10-23 18:11:18,052 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fb2e1522/d54087e0a1214c1bbab97d253d45a12f [2020-10-23 18:11:18,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:11:18,063 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:11:18,065 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:11:18,065 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:11:18,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:11:18,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,074 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a1e4f46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18, skipping insertion in model container [2020-10-23 18:11:18,075 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,083 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:11:18,099 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:11:18,272 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:11:18,283 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:11:18,302 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:11:18,316 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:11:18,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18 WrapperNode [2020-10-23 18:11:18,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:11:18,318 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:11:18,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:11:18,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:11:18,332 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,333 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,341 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,341 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,347 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,351 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (1/1) ... [2020-10-23 18:11:18,353 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:11:18,354 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:11:18,354 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:11:18,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:11:18,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (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 [2020-10-23 18:11:18,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:11:18,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:11:18,436 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:11:18,437 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-10-23 18:11:18,437 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-10-23 18:11:18,437 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:11:18,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 18:11:18,437 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:11:18,437 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:11:18,437 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:11:18,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:11:18,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:11:18,439 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:11:18,439 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:11:18,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:11:18,829 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:11:18,830 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:11:18,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:11:18 BoogieIcfgContainer [2020-10-23 18:11:18,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:11:18,847 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:11:18,847 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:11:18,854 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:11:18,855 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:11:18" (1/3) ... [2020-10-23 18:11:18,855 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a7b7d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:11:18, skipping insertion in model container [2020-10-23 18:11:18,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:11:18" (2/3) ... [2020-10-23 18:11:18,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a7b7d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:11:18, skipping insertion in model container [2020-10-23 18:11:18,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:11:18" (3/3) ... [2020-10-23 18:11:18,864 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-10-23 18:11:18,908 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:11:18,921 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:11:18,952 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:11:19,000 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:11:19,001 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:11:19,001 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:11:19,001 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:11:19,001 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:11:19,001 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:11:19,002 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:11:19,002 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:11:19,029 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-10-23 18:11:19,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:11:19,038 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:11:19,039 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:11:19,039 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:11:19,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:11:19,053 INFO L82 PathProgramCache]: Analyzing trace with hash 219823047, now seen corresponding path program 1 times [2020-10-23 18:11:19,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:11:19,066 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109646791] [2020-10-23 18:11:19,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:11:19,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:19,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:11:19,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:19,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:11:19,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:19,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:11:19,440 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109646791] [2020-10-23 18:11:19,441 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:11:19,441 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:11:19,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439711155] [2020-10-23 18:11:19,447 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:11:19,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:11:19,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:11:19,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:11:19,465 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 6 states. [2020-10-23 18:11:19,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:11:19,783 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-10-23 18:11:19,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:11:19,785 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:11:19,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:11:19,796 INFO L225 Difference]: With dead ends: 50 [2020-10-23 18:11:19,796 INFO L226 Difference]: Without dead ends: 32 [2020-10-23 18:11:19,800 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:11:19,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-23 18:11:19,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-23 18:11:19,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:11:19,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-10-23 18:11:19,857 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 15 [2020-10-23 18:11:19,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:11:19,858 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-10-23 18:11:19,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:11:19,858 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-10-23 18:11:19,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-23 18:11:19,860 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:11:19,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:11:19,861 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:11:19,861 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:11:19,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:11:19,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1220716726, now seen corresponding path program 1 times [2020-10-23 18:11:19,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:11:19,863 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464122228] [2020-10-23 18:11:19,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:11:19,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:19,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:11:19,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:19,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:11:19,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:11:20,002 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464122228] [2020-10-23 18:11:20,002 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:11:20,002 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:11:20,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779492180] [2020-10-23 18:11:20,004 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:11:20,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:11:20,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:11:20,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:11:20,006 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2020-10-23 18:11:20,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:11:20,257 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-10-23 18:11:20,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:11:20,258 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-10-23 18:11:20,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:11:20,260 INFO L225 Difference]: With dead ends: 39 [2020-10-23 18:11:20,260 INFO L226 Difference]: Without dead ends: 34 [2020-10-23 18:11:20,261 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:11:20,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-23 18:11:20,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-10-23 18:11:20,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:11:20,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-10-23 18:11:20,274 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 16 [2020-10-23 18:11:20,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:11:20,274 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-10-23 18:11:20,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:11:20,275 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-10-23 18:11:20,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 18:11:20,276 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:11:20,277 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:11:20,277 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:11:20,277 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:11:20,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:11:20,278 INFO L82 PathProgramCache]: Analyzing trace with hash 2083135015, now seen corresponding path program 1 times [2020-10-23 18:11:20,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:11:20,278 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413268768] [2020-10-23 18:11:20,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:11:20,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:11:20,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:11:20,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 18:11:20,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-10-23 18:11:20,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-23 18:11:20,440 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413268768] [2020-10-23 18:11:20,440 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108795445] [2020-10-23 18:11:20,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:11:20,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:11:20,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-23 18:11:20,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:11:20,643 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-23 18:11:20,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:11:20,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2020-10-23 18:11:20,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198380731] [2020-10-23 18:11:20,645 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 18:11:20,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:11:20,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 18:11:20,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-10-23 18:11:20,646 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 12 states. [2020-10-23 18:11:21,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:11:21,283 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2020-10-23 18:11:21,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-23 18:11:21,284 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-10-23 18:11:21,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:11:21,286 INFO L225 Difference]: With dead ends: 61 [2020-10-23 18:11:21,286 INFO L226 Difference]: Without dead ends: 36 [2020-10-23 18:11:21,287 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-10-23 18:11:21,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-23 18:11:21,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-10-23 18:11:21,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-23 18:11:21,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2020-10-23 18:11:21,298 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 28 [2020-10-23 18:11:21,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:11:21,299 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2020-10-23 18:11:21,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 18:11:21,299 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2020-10-23 18:11:21,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:11:21,301 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:11:21,301 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, 1, 1] [2020-10-23 18:11:21,514 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-23 18:11:21,515 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:11:21,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:11:21,517 INFO L82 PathProgramCache]: Analyzing trace with hash 752879968, now seen corresponding path program 1 times [2020-10-23 18:11:21,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:11:21,518 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754733555] [2020-10-23 18:11:21,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:11:21,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:11:21,540 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:11:21,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:11:21,560 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:11:21,587 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:11:21,587 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:11:21,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 18:11:21,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:11:21 BoogieIcfgContainer [2020-10-23 18:11:21,636 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:11:21,638 INFO L168 Benchmark]: Toolchain (without parser) took 3579.01 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 126.7 MB in the beginning and 105.2 MB in the end (delta: 21.4 MB). Peak memory consumption was 52.2 MB. Max. memory is 8.0 GB. [2020-10-23 18:11:21,639 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:11:21,640 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.78 ms. Allocated memory is still 151.0 MB. Free memory was 125.9 MB in the beginning and 116.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:11:21,641 INFO L168 Benchmark]: Boogie Preprocessor took 35.01 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:11:21,642 INFO L168 Benchmark]: RCFGBuilder took 484.23 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 134.2 MB in the end (delta: -19.0 MB). Peak memory consumption was 16.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:11:21,643 INFO L168 Benchmark]: TraceAbstraction took 2789.03 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 133.4 MB in the beginning and 105.2 MB in the end (delta: 28.2 MB). Peak memory consumption was 58.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:11:21,648 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 252.78 ms. Allocated memory is still 151.0 MB. Free memory was 125.9 MB in the beginning and 116.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.01 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 484.23 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 134.2 MB in the end (delta: -19.0 MB). Peak memory consumption was 16.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2789.03 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 133.4 MB in the beginning and 105.2 MB in the end (delta: 28.2 MB). Peak memory consumption was 58.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L38] int x = 2; VAL [x=2] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L39] int result = fibo1(x); [L40] COND TRUE result == 1 VAL [result=1, x=2] [L41] CALL reach_error() [L4] __assert_fail("0", "fibo_2calls_2-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.5s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 81 SDtfs, 114 SDslu, 129 SDs, 0 SdLazy, 394 SolverSat, 58 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 83 ConstructedInterpolants, 0 QuantifiedInterpolants, 4793 SizeOfPredicates, 3 NumberOfNonLiveVariables, 126 ConjunctsInSsa, 6 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...