/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 0.2.0-7d8eed3 [2020-11-06 22:13:18,779 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:13:18,781 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:13:18,825 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:13:18,826 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:13:18,830 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:13:18,834 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:13:18,841 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:13:18,844 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:13:18,850 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:13:18,851 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:13:18,853 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:13:18,853 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:13:18,856 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:13:18,858 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:13:18,860 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:13:18,861 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:13:18,864 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:13:18,871 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:13:18,878 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:13:18,881 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:13:18,882 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:13:18,883 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:13:18,886 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:13:18,899 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:13:18,909 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:13:18,910 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:13:18,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:13:18,911 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 [2020-11-06 22:13:18,943 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:13:18,943 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:13:18,945 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:13:18,945 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:13:18,946 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:13:18,947 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:13:18,947 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:13:18,948 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:13:18,948 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:13:18,948 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:13:18,949 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:13:18,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:13:18,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:13:18,950 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:13:18,950 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:13:18,950 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:13:18,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:13:18,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:13:18,951 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:13:18,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:13:18,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:13:18,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:13:18,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:13:18,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:13:18,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:13:18,953 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:13:18,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:13:18,953 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:13:18,954 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:13:18,954 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:13:19,404 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:13:19,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:13:19,467 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:13:19,468 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:13:19,470 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:13:19,471 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-11-06 22:13:19,555 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05315d567/ff348f89a50a4b2da4404031c348f729/FLAGb241add31 [2020-11-06 22:13:20,285 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:13:20,286 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-11-06 22:13:20,295 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05315d567/ff348f89a50a4b2da4404031c348f729/FLAGb241add31 [2020-11-06 22:13:20,634 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05315d567/ff348f89a50a4b2da4404031c348f729 [2020-11-06 22:13:20,637 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:13:20,645 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:13:20,647 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:13:20,647 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:13:20,651 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:13:20,652 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:20,658 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33014f0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20, skipping insertion in model container [2020-11-06 22:13:20,659 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:20,667 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:13:20,682 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:13:20,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:13:20,886 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:13:20,915 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:13:20,935 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:13:20,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20 WrapperNode [2020-11-06 22:13:20,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:13:20,941 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:13:20,941 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:13:20,941 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:13:20,956 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:20,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:20,974 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:20,975 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:21,001 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:21,005 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:21,008 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (1/1) ... [2020-11-06 22:13:21,015 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:13:21,019 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:13:21,020 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:13:21,020 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:13:21,021 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (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 [2020-11-06 22:13:21,120 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:13:21,120 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:13:21,121 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:13:21,121 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-11-06 22:13:21,121 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-11-06 22:13:21,122 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:13:21,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:13:21,122 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:13:21,122 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:13:21,123 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:13:21,124 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:13:21,124 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-11-06 22:13:21,124 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-11-06 22:13:21,126 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:13:21,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:13:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:13:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:13:21,128 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:13:21,128 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:13:21,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:13:21,534 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:13:21,534 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:13:21,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:13:21 BoogieIcfgContainer [2020-11-06 22:13:21,536 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:13:21,538 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:13:21,538 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:13:21,541 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:13:21,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:13:20" (1/3) ... [2020-11-06 22:13:21,543 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1acf7749 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:13:21, skipping insertion in model container [2020-11-06 22:13:21,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:13:20" (2/3) ... [2020-11-06 22:13:21,543 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1acf7749 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:13:21, skipping insertion in model container [2020-11-06 22:13:21,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:13:21" (3/3) ... [2020-11-06 22:13:21,545 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-11-06 22:13:21,561 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:13:21,567 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:13:21,581 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:13:21,611 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:13:21,611 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:13:21,611 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:13:21,611 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:13:21,612 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:13:21,612 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:13:21,612 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:13:21,612 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:13:21,632 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-11-06 22:13:21,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:13:21,640 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:13:21,641 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:13:21,641 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:13:21,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:13:21,649 INFO L82 PathProgramCache]: Analyzing trace with hash 219823047, now seen corresponding path program 1 times [2020-11-06 22:13:21,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:13:21,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047580402] [2020-11-06 22:13:21,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:13:21,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:21,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:13:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:21,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:13:21,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:22,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:13:22,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047580402] [2020-11-06 22:13:22,027 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:13:22,027 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:13:22,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893856961] [2020-11-06 22:13:22,034 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:13:22,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:13:22,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:13:22,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:13:22,054 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 6 states. [2020-11-06 22:13:22,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:13:22,506 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-11-06 22:13:22,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:13:22,509 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:13:22,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:13:22,520 INFO L225 Difference]: With dead ends: 50 [2020-11-06 22:13:22,520 INFO L226 Difference]: Without dead ends: 32 [2020-11-06 22:13:22,524 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:13:22,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-06 22:13:22,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-11-06 22:13:22,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:13:22,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:13:22,587 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 15 [2020-11-06 22:13:22,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:13:22,587 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:13:22,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:13:22,588 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:13:22,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-06 22:13:22,590 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:13:22,590 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:13:22,590 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:13:22,591 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:13:22,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:13:22,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1220716726, now seen corresponding path program 1 times [2020-11-06 22:13:22,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:13:22,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079943486] [2020-11-06 22:13:22,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:13:22,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:22,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:13:22,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:22,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:13:22,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:22,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:13:22,724 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079943486] [2020-11-06 22:13:22,725 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:13:22,725 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:13:22,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390358735] [2020-11-06 22:13:22,727 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:13:22,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:13:22,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:13:22,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:13:22,729 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2020-11-06 22:13:23,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:13:23,032 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-11-06 22:13:23,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:13:23,033 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-11-06 22:13:23,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:13:23,035 INFO L225 Difference]: With dead ends: 39 [2020-11-06 22:13:23,035 INFO L226 Difference]: Without dead ends: 34 [2020-11-06 22:13:23,036 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 [2020-11-06 22:13:23,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-06 22:13:23,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-11-06 22:13:23,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:13:23,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:13:23,049 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 16 [2020-11-06 22:13:23,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:13:23,049 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:13:23,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:13:23,049 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:13:23,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:13:23,051 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:13:23,051 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] [2020-11-06 22:13:23,052 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:13:23,052 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:13:23,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:13:23,053 INFO L82 PathProgramCache]: Analyzing trace with hash 2083135015, now seen corresponding path program 1 times [2020-11-06 22:13:23,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:13:23,053 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686006530] [2020-11-06 22:13:23,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:13:23,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:13:23,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:13:23,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:13:23,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:13:23,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:13:23,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686006530] [2020-11-06 22:13:23,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733851688] [2020-11-06 22:13:23,228 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 [2020-11-06 22:13:23,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:13:23,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:13:23,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:13:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:13:23,450 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:13:23,450 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2020-11-06 22:13:23,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660435717] [2020-11-06 22:13:23,451 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-06 22:13:23,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:13:23,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-06 22:13:23,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:13:23,453 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 12 states. [2020-11-06 22:13:24,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:13:24,275 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2020-11-06 22:13:24,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:13:24,276 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-11-06 22:13:24,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:13:24,278 INFO L225 Difference]: With dead ends: 61 [2020-11-06 22:13:24,278 INFO L226 Difference]: Without dead ends: 36 [2020-11-06 22:13:24,279 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-11-06 22:13:24,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-11-06 22:13:24,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-11-06 22:13:24,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-06 22:13:24,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2020-11-06 22:13:24,290 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 28 [2020-11-06 22:13:24,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:13:24,290 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2020-11-06 22:13:24,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-06 22:13:24,290 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2020-11-06 22:13:24,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:13:24,292 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:13:24,292 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] [2020-11-06 22:13:24,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:13:24,507 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:13:24,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:13:24,508 INFO L82 PathProgramCache]: Analyzing trace with hash 752879968, now seen corresponding path program 1 times [2020-11-06 22:13:24,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:13:24,510 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499520323] [2020-11-06 22:13:24,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:13:24,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:13:24,530 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:13:24,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:13:24,552 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:13:24,576 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:13:24,576 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:13:24,577 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-06 22:13:24,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:13:24 BoogieIcfgContainer [2020-11-06 22:13:24,618 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:13:24,621 INFO L168 Benchmark]: Toolchain (without parser) took 3980.12 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 105.7 MB in the end (delta: 21.0 MB). Peak memory consumption was 52.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:13:24,622 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 151.0 MB. Free memory is still 124.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:13:24,622 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.12 ms. Allocated memory is still 151.0 MB. Free memory was 125.9 MB in the beginning and 116.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:13:24,623 INFO L168 Benchmark]: Boogie Preprocessor took 74.65 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 114.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:13:24,624 INFO L168 Benchmark]: RCFGBuilder took 517.03 ms. Allocated memory is still 151.0 MB. Free memory was 114.7 MB in the beginning and 134.3 MB in the end (delta: -19.6 MB). Peak memory consumption was 17.3 MB. Max. memory is 8.0 GB. [2020-11-06 22:13:24,626 INFO L168 Benchmark]: TraceAbstraction took 3080.62 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 134.0 MB in the beginning and 105.7 MB in the end (delta: 28.3 MB). Peak memory consumption was 59.2 MB. Max. memory is 8.0 GB. [2020-11-06 22:13:24,630 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 151.0 MB. Free memory is still 124.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 291.12 ms. Allocated memory is still 151.0 MB. Free memory was 125.9 MB in the beginning and 116.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 74.65 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 114.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 517.03 ms. Allocated memory is still 151.0 MB. Free memory was 114.7 MB in the beginning and 134.3 MB in the end (delta: -19.6 MB). Peak memory consumption was 17.3 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3080.62 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 134.0 MB in the beginning and 105.7 MB in the end (delta: 28.3 MB). Peak memory consumption was 59.2 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: 2.9s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 1.6s, 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, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s 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, 0.6s 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...