./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f4b24e32 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-simple/fibo_2calls_2-1.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 2c47a69833f1a958e38c27482b535b2d176258e52297f9899a8926a996c05520 --- Real Ultimate output --- This is Ultimate 0.2.2-?-f4b24e3 [2022-07-13 18:05:01,057 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-13 18:05:01,059 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-13 18:05:01,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-13 18:05:01,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-13 18:05:01,087 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-13 18:05:01,088 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-13 18:05:01,090 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-13 18:05:01,091 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-13 18:05:01,092 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-13 18:05:01,093 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-13 18:05:01,094 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-13 18:05:01,094 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-13 18:05:01,095 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-13 18:05:01,096 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-13 18:05:01,097 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-13 18:05:01,098 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-13 18:05:01,099 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-13 18:05:01,100 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-13 18:05:01,101 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-13 18:05:01,103 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-13 18:05:01,104 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-13 18:05:01,104 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-13 18:05:01,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-13 18:05:01,106 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-13 18:05:01,108 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-13 18:05:01,109 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-13 18:05:01,109 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-13 18:05:01,110 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-13 18:05:01,110 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-13 18:05:01,111 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-13 18:05:01,112 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-13 18:05:01,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-13 18:05:01,113 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-13 18:05:01,114 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-13 18:05:01,115 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-13 18:05:01,115 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-13 18:05:01,116 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-13 18:05:01,116 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-13 18:05:01,116 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-13 18:05:01,117 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-13 18:05:01,118 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-13 18:05:01,119 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-13 18:05:01,137 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-13 18:05:01,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-13 18:05:01,137 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-13 18:05:01,138 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-13 18:05:01,138 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-13 18:05:01,139 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-13 18:05:01,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-13 18:05:01,140 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-13 18:05:01,140 INFO L138 SettingsManager]: * Use SBE=true [2022-07-13 18:05:01,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-13 18:05:01,140 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-13 18:05:01,141 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-13 18:05:01,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-13 18:05:01,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-13 18:05:01,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-13 18:05:01,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-13 18:05:01,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-13 18:05:01,142 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-13 18:05:01,142 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-13 18:05:01,143 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-13 18:05:01,143 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-13 18:05:01,143 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-13 18:05:01,143 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-13 18:05:01,144 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-13 18:05:01,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-13 18:05:01,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-13 18:05:01,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-13 18:05:01,145 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-13 18:05:01,145 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-13 18:05:01,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-13 18:05:01,145 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-13 18:05:01,146 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-13 18:05:01,146 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-13 18:05:01,146 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2c47a69833f1a958e38c27482b535b2d176258e52297f9899a8926a996c05520 [2022-07-13 18:05:01,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-13 18:05:01,366 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-13 18:05:01,369 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-13 18:05:01,371 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-13 18:05:01,372 INFO L275 PluginConnector]: CDTParser initialized [2022-07-13 18:05:01,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2022-07-13 18:05:01,461 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba614ecf9/1aa24eff3da349659197d59cca517d3c/FLAG7b0eb5fce [2022-07-13 18:05:01,809 INFO L306 CDTParser]: Found 1 translation units. [2022-07-13 18:05:01,809 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2022-07-13 18:05:01,817 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba614ecf9/1aa24eff3da349659197d59cca517d3c/FLAG7b0eb5fce [2022-07-13 18:05:02,218 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba614ecf9/1aa24eff3da349659197d59cca517d3c [2022-07-13 18:05:02,221 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-13 18:05:02,224 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-13 18:05:02,230 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-13 18:05:02,230 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-13 18:05:02,234 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-13 18:05:02,235 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,236 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8549202 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02, skipping insertion in model container [2022-07-13 18:05:02,236 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,242 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-13 18:05:02,259 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-13 18:05:02,438 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-simple/fibo_2calls_2-1.c[946,959] [2022-07-13 18:05:02,441 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-13 18:05:02,448 INFO L203 MainTranslator]: Completed pre-run [2022-07-13 18:05:02,465 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-simple/fibo_2calls_2-1.c[946,959] [2022-07-13 18:05:02,467 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-13 18:05:02,478 INFO L208 MainTranslator]: Completed translation [2022-07-13 18:05:02,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02 WrapperNode [2022-07-13 18:05:02,479 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-13 18:05:02,480 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-13 18:05:02,480 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-13 18:05:02,481 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-13 18:05:02,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,491 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,512 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-07-13 18:05:02,513 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-13 18:05:02,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-13 18:05:02,513 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-13 18:05:02,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-13 18:05:02,520 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,522 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,525 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,527 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,527 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,529 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-13 18:05:02,530 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-13 18:05:02,530 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-13 18:05:02,530 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-13 18:05:02,531 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (1/1) ... [2022-07-13 18:05:02,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-13 18:05:02,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-13 18:05:02,559 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) [2022-07-13 18:05:02,566 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 [2022-07-13 18:05:02,601 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-13 18:05:02,601 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-13 18:05:02,601 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-07-13 18:05:02,602 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-07-13 18:05:02,602 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-07-13 18:05:02,602 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-07-13 18:05:02,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-13 18:05:02,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-13 18:05:02,644 INFO L234 CfgBuilder]: Building ICFG [2022-07-13 18:05:02,645 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-13 18:05:02,728 INFO L275 CfgBuilder]: Performing block encoding [2022-07-13 18:05:02,734 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-13 18:05:02,734 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-07-13 18:05:02,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 06:05:02 BoogieIcfgContainer [2022-07-13 18:05:02,736 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-13 18:05:02,738 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-13 18:05:02,738 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-13 18:05:02,750 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-13 18:05:02,750 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.07 06:05:02" (1/3) ... [2022-07-13 18:05:02,751 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20cfe801 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.07 06:05:02, skipping insertion in model container [2022-07-13 18:05:02,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.07 06:05:02" (2/3) ... [2022-07-13 18:05:02,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20cfe801 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.07 06:05:02, skipping insertion in model container [2022-07-13 18:05:02,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 06:05:02" (3/3) ... [2022-07-13 18:05:02,753 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2022-07-13 18:05:02,766 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-13 18:05:02,766 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-13 18:05:02,808 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-13 18:05:02,814 INFO L357 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, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@404036a4, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@a821227 [2022-07-13 18:05:02,814 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-13 18:05:02,818 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-07-13 18:05:02,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-13 18:05:02,825 INFO L187 NwaCegarLoop]: Found error trace [2022-07-13 18:05:02,825 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-13 18:05:02,826 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-13 18:05:02,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-13 18:05:02,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2022-07-13 18:05:02,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-13 18:05:02,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752646705] [2022-07-13 18:05:02,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-13 18:05:02,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-13 18:05:02,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:02,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-13 18:05:02,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-13 18:05:03,022 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-13 18:05:03,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752646705] [2022-07-13 18:05:03,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752646705] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-13 18:05:03,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-13 18:05:03,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-13 18:05:03,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14092033] [2022-07-13 18:05:03,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-13 18:05:03,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-13 18:05:03,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-13 18:05:03,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-13 18:05:03,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-13 18:05:03,052 INFO L87 Difference]: Start difference. First operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 2.0) 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) [2022-07-13 18:05:03,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-13 18:05:03,158 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2022-07-13 18:05:03,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-13 18:05:03,160 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) 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 [2022-07-13 18:05:03,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-13 18:05:03,167 INFO L225 Difference]: With dead ends: 39 [2022-07-13 18:05:03,167 INFO L226 Difference]: Without dead ends: 27 [2022-07-13 18:05:03,169 INFO L412 NwaCegarLoop]: 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 [2022-07-13 18:05:03,171 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 15 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-13 18:05:03,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 82 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-13 18:05:03,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-07-13 18:05:03,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-07-13 18:05:03,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-13 18:05:03,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-07-13 18:05:03,204 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2022-07-13 18:05:03,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-13 18:05:03,204 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-07-13 18:05:03,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) 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) [2022-07-13 18:05:03,205 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-07-13 18:05:03,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-13 18:05:03,206 INFO L187 NwaCegarLoop]: Found error trace [2022-07-13 18:05:03,206 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-13 18:05:03,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-13 18:05:03,207 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-13 18:05:03,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-13 18:05:03,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2022-07-13 18:05:03,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-13 18:05:03,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633652746] [2022-07-13 18:05:03,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-13 18:05:03,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-13 18:05:03,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-13 18:05:03,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-13 18:05:03,257 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-13 18:05:03,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633652746] [2022-07-13 18:05:03,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633652746] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-13 18:05:03,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-13 18:05:03,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-13 18:05:03,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440860180] [2022-07-13 18:05:03,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-13 18:05:03,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-13 18:05:03,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-13 18:05:03,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-13 18:05:03,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-13 18:05:03,261 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 5 states, 4 states have (on average 2.25) 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) [2022-07-13 18:05:03,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-13 18:05:03,304 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2022-07-13 18:05:03,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-13 18:05:03,305 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) 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 [2022-07-13 18:05:03,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-13 18:05:03,306 INFO L225 Difference]: With dead ends: 33 [2022-07-13 18:05:03,306 INFO L226 Difference]: Without dead ends: 29 [2022-07-13 18:05:03,307 INFO L412 NwaCegarLoop]: 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 [2022-07-13 18:05:03,308 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 10 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-13 18:05:03,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 70 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-13 18:05:03,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-07-13 18:05:03,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-07-13 18:05:03,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-13 18:05:03,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-07-13 18:05:03,316 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2022-07-13 18:05:03,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-13 18:05:03,316 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-07-13 18:05:03,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) 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) [2022-07-13 18:05:03,317 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-07-13 18:05:03,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-07-13 18:05:03,318 INFO L187 NwaCegarLoop]: Found error trace [2022-07-13 18:05:03,318 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-13 18:05:03,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-13 18:05:03,318 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-13 18:05:03,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-13 18:05:03,319 INFO L85 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2022-07-13 18:05:03,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-13 18:05:03,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45969553] [2022-07-13 18:05:03,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-13 18:05:03,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-13 18:05:03,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-13 18:05:03,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,410 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-07-13 18:05:03,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-13 18:05:03,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-13 18:05:03,448 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-13 18:05:03,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45969553] [2022-07-13 18:05:03,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45969553] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-13 18:05:03,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874849898] [2022-07-13 18:05:03,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-13 18:05:03,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-13 18:05:03,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-13 18:05:03,459 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) [2022-07-13 18:05:03,469 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-13 18:05:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-13 18:05:03,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-13 18:05:03,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-13 18:05:03,638 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-13 18:05:03,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-13 18:05:03,882 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-13 18:05:03,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874849898] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-13 18:05:03,882 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-13 18:05:03,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-07-13 18:05:03,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142268383] [2022-07-13 18:05:03,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-13 18:05:03,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-13 18:05:03,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-13 18:05:03,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-13 18:05:03,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-07-13 18:05:03,885 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) [2022-07-13 18:05:04,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-13 18:05:04,074 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-07-13 18:05:04,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-13 18:05:04,076 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) Word has length 23 [2022-07-13 18:05:04,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-13 18:05:04,079 INFO L225 Difference]: With dead ends: 55 [2022-07-13 18:05:04,079 INFO L226 Difference]: Without dead ends: 31 [2022-07-13 18:05:04,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-07-13 18:05:04,087 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 34 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-13 18:05:04,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 97 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-13 18:05:04,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-07-13 18:05:04,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2022-07-13 18:05:04,102 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, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-07-13 18:05:04,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-07-13 18:05:04,105 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2022-07-13 18:05:04,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-13 18:05:04,105 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-07-13 18:05:04,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) [2022-07-13 18:05:04,106 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-07-13 18:05:04,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-13 18:05:04,110 INFO L187 NwaCegarLoop]: Found error trace [2022-07-13 18:05:04,110 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-13 18:05:04,132 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-13 18:05:04,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-13 18:05:04,324 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-13 18:05:04,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-13 18:05:04,324 INFO L85 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2022-07-13 18:05:04,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-13 18:05:04,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396994364] [2022-07-13 18:05:04,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-13 18:05:04,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-13 18:05:04,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-13 18:05:04,342 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-13 18:05:04,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-13 18:05:04,375 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-13 18:05:04,375 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-13 18:05:04,376 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-07-13 18:05:04,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-13 18:05:04,380 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2022-07-13 18:05:04,384 INFO L176 ceAbstractionStarter]: Computing trace abstraction results [2022-07-13 18:05:04,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.07 06:05:04 BoogieIcfgContainer [2022-07-13 18:05:04,402 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-07-13 18:05:04,403 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-07-13 18:05:04,403 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-07-13 18:05:04,403 INFO L275 PluginConnector]: Witness Printer initialized [2022-07-13 18:05:04,404 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 06:05:02" (3/4) ... [2022-07-13 18:05:04,406 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-07-13 18:05:04,433 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2022-07-13 18:05:04,434 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-07-13 18:05:04,434 INFO L158 Benchmark]: Toolchain (without parser) took 2209.69ms. Allocated memory was 88.1MB in the beginning and 113.2MB in the end (delta: 25.2MB). Free memory was 54.0MB in the beginning and 72.0MB in the end (delta: -18.0MB). Peak memory consumption was 6.4MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,435 INFO L158 Benchmark]: CDTParser took 0.21ms. Allocated memory is still 88.1MB. Free memory was 58.1MB in the beginning and 58.1MB in the end (delta: 26.6kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-13 18:05:04,435 INFO L158 Benchmark]: CACSL2BoogieTranslator took 249.59ms. Allocated memory was 88.1MB in the beginning and 113.2MB in the end (delta: 25.2MB). Free memory was 53.7MB in the beginning and 89.8MB in the end (delta: -36.1MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,436 INFO L158 Benchmark]: Boogie Procedure Inliner took 32.35ms. Allocated memory is still 113.2MB. Free memory was 89.8MB in the beginning and 88.4MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,436 INFO L158 Benchmark]: Boogie Preprocessor took 15.72ms. Allocated memory is still 113.2MB. Free memory was 88.4MB in the beginning and 87.4MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-13 18:05:04,436 INFO L158 Benchmark]: RCFGBuilder took 206.84ms. Allocated memory is still 113.2MB. Free memory was 87.4MB in the beginning and 78.3MB in the end (delta: 9.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,437 INFO L158 Benchmark]: TraceAbstraction took 1664.43ms. Allocated memory is still 113.2MB. Free memory was 77.6MB in the beginning and 74.1MB in the end (delta: 3.5MB). Peak memory consumption was 4.8MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,437 INFO L158 Benchmark]: Witness Printer took 30.62ms. Allocated memory is still 113.2MB. Free memory was 73.8MB in the beginning and 72.0MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-13 18:05:04,439 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21ms. Allocated memory is still 88.1MB. Free memory was 58.1MB in the beginning and 58.1MB in the end (delta: 26.6kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 249.59ms. Allocated memory was 88.1MB in the beginning and 113.2MB in the end (delta: 25.2MB). Free memory was 53.7MB in the beginning and 89.8MB in the end (delta: -36.1MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 32.35ms. Allocated memory is still 113.2MB. Free memory was 89.8MB in the beginning and 88.4MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 15.72ms. Allocated memory is still 113.2MB. Free memory was 88.4MB in the beginning and 87.4MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 206.84ms. Allocated memory is still 113.2MB. Free memory was 87.4MB in the beginning and 78.3MB in the end (delta: 9.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 1664.43ms. Allocated memory is still 113.2MB. Free memory was 77.6MB in the beginning and 74.1MB in the end (delta: 3.5MB). Peak memory consumption was 4.8MB. Max. memory is 16.1GB. * Witness Printer took 30.62ms. Allocated memory is still 113.2MB. Free memory was 73.8MB in the beginning and 72.0MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. 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: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 2; VAL [x=2] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L39] int result = fibo1(x); [L40] COND TRUE result == 1 VAL [result=1, x=2] [L41] reach_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.6s, OverallIterations: 4, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 70 SdHoareTripleChecker+Valid, 0.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 59 mSDsluCounter, 249 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 177 mSDsCounter, 16 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 229 IncrementalHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 16 mSolverCounterUnsat, 72 mSDtfsCounter, 229 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=0, InterpolantAutomatonStates: 20, 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, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 181 SizeOfPredicates, 2 NumberOfNonLiveVariables, 75 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 3/12 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! [2022-07-13 18:05:04,481 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