/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 09:24:39,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 09:24:39,763 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 09:24:39,818 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 09:24:39,819 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 09:24:39,823 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 09:24:39,827 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 09:24:39,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 09:24:39,837 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 09:24:39,846 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 09:24:39,851 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 09:24:39,853 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 09:24:39,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 09:24:39,858 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 09:24:39,860 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 09:24:39,861 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 09:24:39,863 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 09:24:39,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 09:24:39,875 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 09:24:39,880 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 09:24:39,885 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 09:24:39,887 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 09:24:39,889 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 09:24:39,914 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 09:24:39,924 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 09:24:39,930 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 09:24:39,931 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 09:24:39,934 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 09:24:39,935 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 09:24:39,936 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 09:24:39,937 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 09:24:39,938 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 09:24:39,938 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 09:24:39,938 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 09:24:39,939 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 09:24:39,940 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 09:24:39,945 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 09:24:39,995 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 09:24:39,995 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 09:24:40,005 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 09:24:40,006 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 09:24:40,006 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 09:24:40,006 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 09:24:40,006 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 09:24:40,007 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 09:24:40,007 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 09:24:40,007 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 09:24:40,009 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 09:24:40,009 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 09:24:40,009 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 09:24:40,009 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 09:24:40,010 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 09:24:40,010 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 09:24:40,010 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 09:24:40,010 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 09:24:40,011 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 09:24:40,011 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 09:24:40,011 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 09:24:40,011 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 09:24:40,012 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 09:24:40,012 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 09:24:40,012 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 09:24:40,012 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 09:24:40,414 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 09:24:40,452 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 09:24:40,456 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 09:24:40,458 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 09:24:40,459 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 09:24:40,460 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2020-12-23 09:24:40,562 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/363b6aab1/f8539e8ac4f34ea6a9035ace5d2bf831/FLAG365f78738 [2020-12-23 09:24:41,259 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 09:24:41,259 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2020-12-23 09:24:41,268 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/363b6aab1/f8539e8ac4f34ea6a9035ace5d2bf831/FLAG365f78738 [2020-12-23 09:24:41,612 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/363b6aab1/f8539e8ac4f34ea6a9035ace5d2bf831 [2020-12-23 09:24:41,615 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 09:24:41,618 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 09:24:41,622 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 09:24:41,622 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 09:24:41,626 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 09:24:41,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,630 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22092625 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41, skipping insertion in model container [2020-12-23 09:24:41,630 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,639 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 09:24:41,658 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 09:24:41,885 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2020-12-23 09:24:41,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 09:24:41,908 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 09:24:41,927 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2020-12-23 09:24:41,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 09:24:41,945 INFO L208 MainTranslator]: Completed translation [2020-12-23 09:24:41,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41 WrapperNode [2020-12-23 09:24:41,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 09:24:41,947 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 09:24:41,947 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 09:24:41,947 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 09:24:41,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,965 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,984 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 09:24:41,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 09:24:41,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 09:24:41,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 09:24:41,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,996 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,997 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:41,998 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:42,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:42,004 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:42,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... [2020-12-23 09:24:42,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 09:24:42,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 09:24:42,009 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 09:24:42,010 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 09:24:42,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 09:24:42,100 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 09:24:42,101 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-12-23 09:24:42,101 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-12-23 09:24:42,101 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 09:24:42,101 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-12-23 09:24:42,101 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-12-23 09:24:42,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 09:24:42,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 09:24:42,388 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 09:24:42,389 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-23 09:24:42,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:24:42 BoogieIcfgContainer [2020-12-23 09:24:42,406 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 09:24:42,411 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 09:24:42,412 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 09:24:42,415 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 09:24:42,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 09:24:41" (1/3) ... [2020-12-23 09:24:42,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27ac28c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 09:24:42, skipping insertion in model container [2020-12-23 09:24:42,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 09:24:41" (2/3) ... [2020-12-23 09:24:42,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27ac28c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 09:24:42, skipping insertion in model container [2020-12-23 09:24:42,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:24:42" (3/3) ... [2020-12-23 09:24:42,430 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-12-23 09:24:42,447 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 09:24:42,453 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 09:24:42,482 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 09:24:42,518 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 09:24:42,519 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 09:24:42,519 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 09:24:42,519 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 09:24:42,519 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 09:24:42,519 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 09:24:42,520 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 09:24:42,520 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 09:24:42,542 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-12-23 09:24:42,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 09:24:42,549 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:24:42,550 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 09:24:42,551 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:24:42,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:24:42,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2020-12-23 09:24:42,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:24:42,570 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941366826] [2020-12-23 09:24:42,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:24:42,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:42,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-23 09:24:42,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 09:24:43,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941366826] [2020-12-23 09:24:43,010 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 09:24:43,010 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 09:24:43,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111576831] [2020-12-23 09:24:43,025 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 09:24:43,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:24:43,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 09:24:43,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-23 09:24:43,050 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 5 states. [2020-12-23 09:24:43,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:24:43,147 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2020-12-23 09:24:43,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 09:24:43,150 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-23 09:24:43,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:24:43,162 INFO L225 Difference]: With dead ends: 39 [2020-12-23 09:24:43,163 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 09:24:43,167 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 09:24:43,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 09:24:43,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-12-23 09:24:43,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 09:24:43,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2020-12-23 09:24:43,222 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2020-12-23 09:24:43,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:24:43,223 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2020-12-23 09:24:43,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 09:24:43,223 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2020-12-23 09:24:43,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 09:24:43,226 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:24:43,226 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 09:24:43,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 09:24:43,227 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:24:43,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:24:43,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2020-12-23 09:24:43,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:24:43,229 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171435082] [2020-12-23 09:24:43,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:24:43,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-23 09:24:43,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 09:24:43,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171435082] [2020-12-23 09:24:43,327 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 09:24:43,327 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 09:24:43,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690869405] [2020-12-23 09:24:43,329 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 09:24:43,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:24:43,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 09:24:43,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-23 09:24:43,334 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 5 states. [2020-12-23 09:24:43,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:24:43,408 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2020-12-23 09:24:43,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 09:24:43,409 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-23 09:24:43,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:24:43,410 INFO L225 Difference]: With dead ends: 33 [2020-12-23 09:24:43,410 INFO L226 Difference]: Without dead ends: 29 [2020-12-23 09:24:43,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 09:24:43,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-23 09:24:43,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-12-23 09:24:43,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 09:24:43,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2020-12-23 09:24:43,422 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2020-12-23 09:24:43,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:24:43,423 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2020-12-23 09:24:43,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 09:24:43,423 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2020-12-23 09:24:43,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 09:24:43,425 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:24:43,425 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] [2020-12-23 09:24:43,426 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 09:24:43,426 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:24:43,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:24:43,427 INFO L82 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2020-12-23 09:24:43,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:24:43,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229798644] [2020-12-23 09:24:43,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:24:43,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-23 09:24:43,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-23 09:24:43,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-12-23 09:24:43,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,605 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 09:24:43,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229798644] [2020-12-23 09:24:43,606 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280768879] [2020-12-23 09:24:43,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 09:24:43,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 09:24:43,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 09:24:43,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 09:24:43,863 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 09:24:43,864 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 09:24:43,864 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2020-12-23 09:24:43,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418971673] [2020-12-23 09:24:43,865 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 09:24:43,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 09:24:43,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 09:24:43,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-12-23 09:24:43,867 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 11 states. [2020-12-23 09:24:44,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 09:24:44,095 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2020-12-23 09:24:44,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 09:24:44,096 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-23 09:24:44,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 09:24:44,097 INFO L225 Difference]: With dead ends: 55 [2020-12-23 09:24:44,098 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 09:24:44,099 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-12-23 09:24:44,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 09:24:44,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-23 09:24:44,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 09:24:44,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2020-12-23 09:24:44,108 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2020-12-23 09:24:44,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 09:24:44,108 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2020-12-23 09:24:44,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 09:24:44,109 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2020-12-23 09:24:44,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 09:24:44,110 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 09:24:44,111 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] [2020-12-23 09:24:44,324 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-23 09:24:44,325 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 09:24:44,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 09:24:44,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2020-12-23 09:24:44,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 09:24:44,328 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508898110] [2020-12-23 09:24:44,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 09:24:44,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 09:24:44,350 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 09:24:44,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 09:24:44,368 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 09:24:44,391 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-23 09:24:44,392 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-23 09:24:44,392 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 09:24:44,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 09:24:44 BoogieIcfgContainer [2020-12-23 09:24:44,434 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 09:24:44,434 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 09:24:44,434 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 09:24:44,435 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 09:24:44,435 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 09:24:42" (3/4) ... [2020-12-23 09:24:44,438 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-23 09:24:44,526 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/fibo_2calls_2-1.c-witness.graphml [2020-12-23 09:24:44,526 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 09:24:44,528 INFO L168 Benchmark]: Toolchain (without parser) took 2909.95 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 115.3 MB in the end (delta: 11.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,529 INFO L168 Benchmark]: CDTParser took 0.22 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. [2020-12-23 09:24:44,531 INFO L168 Benchmark]: CACSL2BoogieTranslator took 324.41 ms. Allocated memory is still 151.0 MB. Free memory was 126.5 MB in the beginning and 117.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,532 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.19 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.6 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,533 INFO L168 Benchmark]: Boogie Preprocessor took 23.56 ms. Allocated memory is still 151.0 MB. Free memory was 115.6 MB in the beginning and 114.6 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,539 INFO L168 Benchmark]: RCFGBuilder took 397.25 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 134.0 MB in the end (delta: -19.4 MB). Peak memory consumption was 15.2 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,540 INFO L168 Benchmark]: TraceAbstraction took 2022.44 ms. Allocated memory is still 151.0 MB. Free memory was 133.4 MB in the beginning and 117.9 MB in the end (delta: 15.6 MB). Peak memory consumption was 16.1 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,542 INFO L168 Benchmark]: Witness Printer took 91.75 ms. Allocated memory is still 151.0 MB. Free memory was 117.9 MB in the beginning and 115.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-23 09:24:44,548 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 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 324.41 ms. Allocated memory is still 151.0 MB. Free memory was 126.5 MB in the beginning and 117.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 37.19 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.6 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 23.56 ms. Allocated memory is still 151.0 MB. Free memory was 115.6 MB in the beginning and 114.6 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 397.25 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 134.0 MB in the end (delta: -19.4 MB). Peak memory consumption was 15.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2022.44 ms. Allocated memory is still 151.0 MB. Free memory was 133.4 MB in the beginning and 117.9 MB in the end (delta: 15.6 MB). Peak memory consumption was 16.1 MB. Max. memory is 8.0 GB. * Witness Printer took 91.75 ms. Allocated memory is still 151.0 MB. Free memory was 117.9 MB in the beginning and 115.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int 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) [L39] int result = fibo1(x); [L40] COND TRUE result == 1 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.8s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 72 SDtfs, 51 SDslu, 232 SDs, 0 SdLazy, 195 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 55 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred 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, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 63 ConstructedInterpolants, 0 QuantifiedInterpolants, 2113 SizeOfPredicates, 3 NumberOfNonLiveVariables, 81 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...