./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive/Fibonacci04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive/Fibonacci04.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 13:17:35,350 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 13:17:35,352 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 13:17:35,386 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 13:17:35,387 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 13:17:35,390 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 13:17:35,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 13:17:35,397 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 13:17:35,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 13:17:35,402 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 13:17:35,403 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 13:17:35,404 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 13:17:35,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 13:17:35,406 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 13:17:35,408 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 13:17:35,409 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 13:17:35,410 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 13:17:35,410 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 13:17:35,414 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 13:17:35,419 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 13:17:35,420 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 13:17:35,421 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 13:17:35,423 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 13:17:35,423 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 13:17:35,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 13:17:35,430 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 13:17:35,430 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 13:17:35,431 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 13:17:35,432 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 13:17:35,432 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 13:17:35,433 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 13:17:35,434 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 13:17:35,435 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 13:17:35,436 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 13:17:35,437 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 13:17:35,437 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 13:17:35,437 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 13:17:35,438 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 13:17:35,438 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 13:17:35,439 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 13:17:35,439 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 13:17:35,441 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 13:17:35,472 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 13:17:35,473 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 13:17:35,473 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 13:17:35,473 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 13:17:35,474 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 13:17:35,474 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 13:17:35,475 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 13:17:35,475 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 13:17:35,475 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 13:17:35,475 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 13:17:35,476 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 13:17:35,476 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 13:17:35,477 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 13:17:35,478 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 13:17:35,478 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 13:17:35,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 13:17:35,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 13:17:35,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 13:17:35,479 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 13:17:35,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:17:35,479 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 13:17:35,479 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 13:17:35,480 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 13:17:35,481 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 13:17:35,481 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 13:17:35,481 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 13:17:35,481 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 13:17:35,481 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 13:17:35,482 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 13:17:35,482 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 [2021-12-21 13:17:35,726 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 13:17:35,759 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 13:17:35,761 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 13:17:35,762 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 13:17:35,763 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 13:17:35,764 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/Fibonacci04.c [2021-12-21 13:17:35,829 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5242ec69a/c551f2dcfea7447384e6d690f4d6a31c/FLAG399a225b3 [2021-12-21 13:17:36,121 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 13:17:36,122 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Fibonacci04.c [2021-12-21 13:17:36,127 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5242ec69a/c551f2dcfea7447384e6d690f4d6a31c/FLAG399a225b3 [2021-12-21 13:17:36,557 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5242ec69a/c551f2dcfea7447384e6d690f4d6a31c [2021-12-21 13:17:36,559 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 13:17:36,560 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 13:17:36,565 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 13:17:36,565 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 13:17:36,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 13:17:36,571 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,572 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1dbf6051 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36, skipping insertion in model container [2021-12-21 13:17:36,572 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,578 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 13:17:36,589 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 13:17:36,688 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-12-21 13:17:36,691 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:17:36,699 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 13:17:36,710 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-12-21 13:17:36,710 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 13:17:36,720 INFO L208 MainTranslator]: Completed translation [2021-12-21 13:17:36,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36 WrapperNode [2021-12-21 13:17:36,721 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 13:17:36,722 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 13:17:36,722 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 13:17:36,722 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 13:17:36,728 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,733 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,745 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 23 [2021-12-21 13:17:36,746 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 13:17:36,746 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 13:17:36,746 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 13:17:36,746 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 13:17:36,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,753 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,754 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,756 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,757 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,758 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,759 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 13:17:36,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 13:17:36,760 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 13:17:36,760 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 13:17:36,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (1/1) ... [2021-12-21 13:17:36,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 13:17:36,778 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:17:36,792 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 13:17:36,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 13:17:36,840 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-12-21 13:17:36,840 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-12-21 13:17:36,840 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 13:17:36,840 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 13:17:36,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 13:17:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 13:17:36,891 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 13:17:36,893 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 13:17:37,022 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 13:17:37,027 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 13:17:37,027 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-21 13:17:37,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:17:37 BoogieIcfgContainer [2021-12-21 13:17:37,029 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 13:17:37,030 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 13:17:37,030 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 13:17:37,033 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 13:17:37,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 01:17:36" (1/3) ... [2021-12-21 13:17:37,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36df9d5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:17:37, skipping insertion in model container [2021-12-21 13:17:37,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 01:17:36" (2/3) ... [2021-12-21 13:17:37,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36df9d5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 01:17:37, skipping insertion in model container [2021-12-21 13:17:37,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:17:37" (3/3) ... [2021-12-21 13:17:37,036 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2021-12-21 13:17:37,044 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 13:17:37,044 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 13:17:37,076 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 13:17:37,082 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 13:17:37,082 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 13:17:37,095 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 13:17:37,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 13:17:37,099 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:37,100 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:37,100 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:37,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:37,106 INFO L85 PathProgramCache]: Analyzing trace with hash 117289724, now seen corresponding path program 1 times [2021-12-21 13:17:37,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:37,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691955752] [2021-12-21 13:17:37,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:37,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:37,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:17:37,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 13:17:37,316 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:17:37,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691955752] [2021-12-21 13:17:37,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691955752] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 13:17:37,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 13:17:37,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 13:17:37,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671548498] [2021-12-21 13:17:37,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 13:17:37,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 13:17:37,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:17:37,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 13:17:37,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:17:37,344 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 13:17:37,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:17:37,401 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2021-12-21 13:17:37,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 13:17:37,403 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-12-21 13:17:37,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:17:37,409 INFO L225 Difference]: With dead ends: 31 [2021-12-21 13:17:37,409 INFO L226 Difference]: Without dead ends: 18 [2021-12-21 13:17:37,412 INFO L932 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 [2021-12-21 13:17:37,415 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 11 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:17:37,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 41 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:17:37,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-21 13:17:37,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-12-21 13:17:37,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-21 13:17:37,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-12-21 13:17:37,478 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2021-12-21 13:17:37,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:17:37,479 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-12-21 13:17:37,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 13:17:37,479 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-12-21 13:17:37,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 13:17:37,480 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:37,480 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:37,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 13:17:37,481 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:37,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:37,483 INFO L85 PathProgramCache]: Analyzing trace with hash 36927066, now seen corresponding path program 1 times [2021-12-21 13:17:37,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:37,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751127767] [2021-12-21 13:17:37,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:37,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:37,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:17:37,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 13:17:37,551 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:17:37,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751127767] [2021-12-21 13:17:37,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751127767] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 13:17:37,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 13:17:37,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 13:17:37,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784703285] [2021-12-21 13:17:37,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 13:17:37,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 13:17:37,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:17:37,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 13:17:37,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 13:17:37,554 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 13:17:37,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:17:37,593 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2021-12-21 13:17:37,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 13:17:37,593 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-21 13:17:37,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:17:37,594 INFO L225 Difference]: With dead ends: 24 [2021-12-21 13:17:37,594 INFO L226 Difference]: Without dead ends: 20 [2021-12-21 13:17:37,595 INFO L932 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 [2021-12-21 13:17:37,596 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 7 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 13:17:37,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 33 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 13:17:37,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-12-21 13:17:37,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-12-21 13:17:37,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-21 13:17:37,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-12-21 13:17:37,602 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2021-12-21 13:17:37,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:17:37,603 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-12-21 13:17:37,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 13:17:37,603 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-12-21 13:17:37,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 13:17:37,604 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:37,604 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:37,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 13:17:37,605 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:37,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:37,605 INFO L85 PathProgramCache]: Analyzing trace with hash 703243533, now seen corresponding path program 1 times [2021-12-21 13:17:37,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:37,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408053448] [2021-12-21 13:17:37,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:37,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:37,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:17:37,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,710 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:37,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-21 13:17:37,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,751 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 13:17:37,752 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:17:37,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408053448] [2021-12-21 13:17:37,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408053448] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:17:37,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931429701] [2021-12-21 13:17:37,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:37,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:17:37,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:17:37,756 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:17:37,757 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 13:17:37,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:37,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 13:17:37,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:17:37,998 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 13:17:37,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:17:38,240 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 13:17:38,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931429701] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:17:38,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:17:38,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 13 [2021-12-21 13:17:38,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441277967] [2021-12-21 13:17:38,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:17:38,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 13:17:38,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:17:38,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 13:17:38,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-12-21 13:17:38,251 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 13:17:38,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:17:38,458 INFO L93 Difference]: Finished difference Result 46 states and 69 transitions. [2021-12-21 13:17:38,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 13:17:38,458 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) Word has length 23 [2021-12-21 13:17:38,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:17:38,460 INFO L225 Difference]: With dead ends: 46 [2021-12-21 13:17:38,460 INFO L226 Difference]: Without dead ends: 29 [2021-12-21 13:17:38,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=272, Unknown=0, NotChecked=0, Total=380 [2021-12-21 13:17:38,461 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 48 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:17:38,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 65 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:17:38,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-21 13:17:38,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-12-21 13:17:38,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-12-21 13:17:38,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 41 transitions. [2021-12-21 13:17:38,470 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 41 transitions. Word has length 23 [2021-12-21 13:17:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:17:38,470 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 41 transitions. [2021-12-21 13:17:38,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 13 states have internal predecessors, (35), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 13:17:38,470 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 41 transitions. [2021-12-21 13:17:38,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-21 13:17:38,472 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:38,472 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:38,493 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 13:17:38,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:17:38,688 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:38,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:38,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1937134450, now seen corresponding path program 1 times [2021-12-21 13:17:38,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:38,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049385227] [2021-12-21 13:17:38,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:38,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:38,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:17:38,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:38,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:38,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:38,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:17:38,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:38,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:38,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:38,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:38,943 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 44 proven. 63 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-12-21 13:17:38,943 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:17:38,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049385227] [2021-12-21 13:17:38,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049385227] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:17:38,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272782491] [2021-12-21 13:17:38,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:38,944 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:17:38,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:17:38,946 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:17:38,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 13:17:39,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:39,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 13:17:39,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:17:39,217 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-12-21 13:17:39,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:17:39,600 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 16 proven. 82 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-12-21 13:17:39,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272782491] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:17:39,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:17:39,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 9] total 18 [2021-12-21 13:17:39,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066124555] [2021-12-21 13:17:39,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:17:39,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 13:17:39,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:17:39,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 13:17:39,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2021-12-21 13:17:39,603 INFO L87 Difference]: Start difference. First operand 29 states and 41 transitions. Second operand has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 11 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 11 states have call predecessors, (18), 11 states have call successors, (18) [2021-12-21 13:17:39,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:17:39,805 INFO L93 Difference]: Finished difference Result 73 states and 118 transitions. [2021-12-21 13:17:39,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 13:17:39,806 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 11 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 11 states have call predecessors, (18), 11 states have call successors, (18) Word has length 65 [2021-12-21 13:17:39,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:17:39,809 INFO L225 Difference]: With dead ends: 73 [2021-12-21 13:17:39,809 INFO L226 Difference]: Without dead ends: 44 [2021-12-21 13:17:39,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=160, Invalid=392, Unknown=0, NotChecked=0, Total=552 [2021-12-21 13:17:39,811 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 37 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:17:39,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 94 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:17:39,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-21 13:17:39,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-12-21 13:17:39,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2021-12-21 13:17:39,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 61 transitions. [2021-12-21 13:17:39,820 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 61 transitions. Word has length 65 [2021-12-21 13:17:39,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:17:39,821 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 61 transitions. [2021-12-21 13:17:39,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 11 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 11 states have call predecessors, (18), 11 states have call successors, (18) [2021-12-21 13:17:39,821 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 61 transitions. [2021-12-21 13:17:39,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-12-21 13:17:39,824 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:39,824 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:39,849 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 13:17:40,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-21 13:17:40,048 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:40,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:40,048 INFO L85 PathProgramCache]: Analyzing trace with hash -1961744707, now seen corresponding path program 2 times [2021-12-21 13:17:40,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:40,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352028399] [2021-12-21 13:17:40,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:40,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:40,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-21 13:17:40,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,176 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:17:40,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-21 13:17:40,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:40,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-12-21 13:17:40,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 13:17:40,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-21 13:17:40,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-21 13:17:40,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 13:17:40,318 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 85 proven. 119 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-21 13:17:40,318 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 13:17:40,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352028399] [2021-12-21 13:17:40,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352028399] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 13:17:40,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855993088] [2021-12-21 13:17:40,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 13:17:40,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:17:40,321 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 13:17:40,324 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 13:17:40,325 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 13:17:40,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 13:17:40,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 13:17:40,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 13:17:40,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 13:17:40,601 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 64 proven. 158 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-12-21 13:17:40,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 13:17:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-12-21 13:17:41,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855993088] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 13:17:41,242 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 13:17:41,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11] total 17 [2021-12-21 13:17:41,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990851745] [2021-12-21 13:17:41,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 13:17:41,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 13:17:41,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 13:17:41,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 13:17:41,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-12-21 13:17:41,244 INFO L87 Difference]: Start difference. First operand 44 states and 61 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 10 states have call successors, (15), 1 states have call predecessors, (15), 7 states have return successors, (20), 11 states have call predecessors, (20), 10 states have call successors, (20) [2021-12-21 13:17:41,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 13:17:41,461 INFO L93 Difference]: Finished difference Result 101 states and 150 transitions. [2021-12-21 13:17:41,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 13:17:41,462 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 10 states have call successors, (15), 1 states have call predecessors, (15), 7 states have return successors, (20), 11 states have call predecessors, (20), 10 states have call successors, (20) Word has length 104 [2021-12-21 13:17:41,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 13:17:41,469 INFO L225 Difference]: With dead ends: 101 [2021-12-21 13:17:41,469 INFO L226 Difference]: Without dead ends: 60 [2021-12-21 13:17:41,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 227 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=182, Invalid=418, Unknown=0, NotChecked=0, Total=600 [2021-12-21 13:17:41,474 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 66 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 13:17:41,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 92 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 13:17:41,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-21 13:17:41,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 44. [2021-12-21 13:17:41,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (16), 9 states have call predecessors, (16), 7 states have call successors, (16) [2021-12-21 13:17:41,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-12-21 13:17:41,495 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 104 [2021-12-21 13:17:41,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 13:17:41,496 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-12-21 13:17:41,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 10 states have call successors, (15), 1 states have call predecessors, (15), 7 states have return successors, (20), 11 states have call predecessors, (20), 10 states have call successors, (20) [2021-12-21 13:17:41,496 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-12-21 13:17:41,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-12-21 13:17:41,503 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 13:17:41,503 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 13:17:41,523 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-21 13:17:41,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 13:17:41,715 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 13:17:41,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 13:17:41,716 INFO L85 PathProgramCache]: Analyzing trace with hash -2094125593, now seen corresponding path program 3 times [2021-12-21 13:17:41,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 13:17:41,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86915382] [2021-12-21 13:17:41,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 13:17:41,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 13:17:41,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-21 13:17:41,744 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-21 13:17:41,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-21 13:17:41,777 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-21 13:17:41,777 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-12-21 13:17:41,778 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-12-21 13:17:41,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-21 13:17:41,783 INFO L732 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1] [2021-12-21 13:17:41,785 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-21 13:17:41,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.12 01:17:41 BoogieIcfgContainer [2021-12-21 13:17:41,847 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-21 13:17:41,848 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-21 13:17:41,848 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-21 13:17:41,849 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-21 13:17:41,849 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 01:17:37" (3/4) ... [2021-12-21 13:17:41,851 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-12-21 13:17:41,907 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-12-21 13:17:41,907 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-21 13:17:41,908 INFO L158 Benchmark]: Toolchain (without parser) took 5347.65ms. Allocated memory was 98.6MB in the beginning and 127.9MB in the end (delta: 29.4MB). Free memory was 59.5MB in the beginning and 66.1MB in the end (delta: -6.6MB). Peak memory consumption was 26.7MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,908 INFO L158 Benchmark]: CDTParser took 0.19ms. Allocated memory is still 98.6MB. Free memory is still 76.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 13:17:41,909 INFO L158 Benchmark]: CACSL2BoogieTranslator took 156.72ms. Allocated memory is still 98.6MB. Free memory was 59.3MB in the beginning and 49.8MB in the end (delta: 9.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,909 INFO L158 Benchmark]: Boogie Procedure Inliner took 23.73ms. Allocated memory is still 98.6MB. Free memory was 49.7MB in the beginning and 48.4MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 13:17:41,914 INFO L158 Benchmark]: Boogie Preprocessor took 13.02ms. Allocated memory is still 98.6MB. Free memory was 48.4MB in the beginning and 47.5MB in the end (delta: 879.6kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,915 INFO L158 Benchmark]: RCFGBuilder took 269.28ms. Allocated memory is still 98.6MB. Free memory was 47.4MB in the beginning and 76.4MB in the end (delta: -29.0MB). Peak memory consumption was 11.5MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,915 INFO L158 Benchmark]: TraceAbstraction took 4816.96ms. Allocated memory was 98.6MB in the beginning and 127.9MB in the end (delta: 29.4MB). Free memory was 75.7MB in the beginning and 69.2MB in the end (delta: 6.5MB). Peak memory consumption was 36.1MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,915 INFO L158 Benchmark]: Witness Printer took 59.79ms. Allocated memory is still 127.9MB. Free memory was 69.2MB in the beginning and 66.1MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-12-21 13:17:41,917 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19ms. Allocated memory is still 98.6MB. Free memory is still 76.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 156.72ms. Allocated memory is still 98.6MB. Free memory was 59.3MB in the beginning and 49.8MB in the end (delta: 9.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 23.73ms. Allocated memory is still 98.6MB. Free memory was 49.7MB in the beginning and 48.4MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 13.02ms. Allocated memory is still 98.6MB. Free memory was 48.4MB in the beginning and 47.5MB in the end (delta: 879.6kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 269.28ms. Allocated memory is still 98.6MB. Free memory was 47.4MB in the beginning and 76.4MB in the end (delta: -29.0MB). Peak memory consumption was 11.5MB. Max. memory is 16.1GB. * TraceAbstraction took 4816.96ms. Allocated memory was 98.6MB in the beginning and 127.9MB in the end (delta: 29.4MB). Free memory was 75.7MB in the beginning and 69.2MB in the end (delta: 6.5MB). Peak memory consumption was 36.1MB. Max. memory is 16.1GB. * Witness Printer took 59.79ms. Allocated memory is still 127.9MB. Free memory was 69.2MB in the beginning and 66.1MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 35]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L30] int x = __VERIFIER_nondet_int(); [L31] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L19] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L21] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L19] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L21] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L24] return fibonacci(n-1) + fibonacci(n-2); [L31] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L35] reach_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 4.7s, OverallIterations: 6, TraceHistogramMax: 15, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.0s, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 180 SdHoareTripleChecker+Valid, 0.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 169 mSDsluCounter, 325 SdHoareTripleChecker+Invalid, 0.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 248 mSDsCounter, 173 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 507 IncrementalHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 173 mSolverCounterUnsat, 77 mSDtfsCounter, 507 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 499 GetRequests, 421 SyntacticMatches, 7 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=4, InterpolantAutomatonStates: 52, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 18 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.6s InterpolantComputationTime, 511 NumberOfCodeBlocks, 511 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 586 ConstructedInterpolants, 0 QuantifiedInterpolants, 1103 SizeOfPredicates, 10 NumberOfNonLiveVariables, 501 ConjunctsInSsa, 24 ConjunctsInUnsatCore, 11 InterpolantComputations, 2 PerfectInterpolantSequences, 1567/2250 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! [2021-12-21 13:17:41,950 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE