./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash db54bc93f5615de8b0a803193005d14234c84165 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 08:22:27,051 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 08:22:27,052 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 08:22:27,078 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 08:22:27,079 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 08:22:27,080 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 08:22:27,081 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 08:22:27,083 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 08:22:27,088 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 08:22:27,089 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 08:22:27,090 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 08:22:27,092 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 08:22:27,092 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 08:22:27,093 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 08:22:27,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 08:22:27,095 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 08:22:27,096 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 08:22:27,097 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 08:22:27,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 08:22:27,100 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 08:22:27,101 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 08:22:27,102 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 08:22:27,103 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 08:22:27,104 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 08:22:27,106 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 08:22:27,107 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 08:22:27,107 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 08:22:27,108 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 08:22:27,108 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 08:22:27,109 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 08:22:27,109 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 08:22:27,110 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 08:22:27,110 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 08:22:27,111 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 08:22:27,112 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 08:22:27,112 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 08:22:27,112 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 08:22:27,112 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 08:22:27,113 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 08:22:27,113 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 08:22:27,114 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 08:22:27,114 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 08:22:27,132 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 08:22:27,132 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 08:22:27,132 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 08:22:27,132 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 08:22:27,133 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 08:22:27,133 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 08:22:27,133 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 08:22:27,134 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 08:22:27,134 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 08:22:27,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 08:22:27,134 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 08:22:27,135 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 08:22:27,136 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 08:22:27,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 08:22:27,136 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 08:22:27,137 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 08:22:27,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 08:22:27,137 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 08:22:27,137 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 08:22:27,137 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db54bc93f5615de8b0a803193005d14234c84165 [2020-12-09 08:22:27,315 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 08:22:27,331 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 08:22:27,332 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 08:22:27,333 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 08:22:27,334 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 08:22:27,334 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/../../sv-benchmarks/c/recursive/Fibonacci04.c [2020-12-09 08:22:27,377 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/data/f7f9ede03/1b9069d38fd24aa4be5b89f7d8505546/FLAG97686a84c [2020-12-09 08:22:27,732 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 08:22:27,732 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/sv-benchmarks/c/recursive/Fibonacci04.c [2020-12-09 08:22:27,739 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/data/f7f9ede03/1b9069d38fd24aa4be5b89f7d8505546/FLAG97686a84c [2020-12-09 08:22:28,169 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/data/f7f9ede03/1b9069d38fd24aa4be5b89f7d8505546 [2020-12-09 08:22:28,171 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 08:22:28,172 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 08:22:28,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 08:22:28,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 08:22:28,176 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 08:22:28,177 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@787b791d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28, skipping insertion in model container [2020-12-09 08:22:28,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,185 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 08:22:28,194 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 08:22:28,308 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2020-12-09 08:22:28,311 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 08:22:28,320 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 08:22:28,330 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2020-12-09 08:22:28,331 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 08:22:28,341 INFO L208 MainTranslator]: Completed translation [2020-12-09 08:22:28,342 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28 WrapperNode [2020-12-09 08:22:28,342 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 08:22:28,343 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 08:22:28,343 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 08:22:28,343 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 08:22:28,349 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,353 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,364 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 08:22:28,365 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 08:22:28,365 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 08:22:28,365 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 08:22:28,371 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,371 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,372 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,372 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,375 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,377 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,378 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... [2020-12-09 08:22:28,379 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 08:22:28,380 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 08:22:28,380 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 08:22:28,380 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 08:22:28,381 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 08:22:28,435 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-12-09 08:22:28,435 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-12-09 08:22:28,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 08:22:28,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 08:22:28,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 08:22:28,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 08:22:28,593 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 08:22:28,593 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-09 08:22:28,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:22:28 BoogieIcfgContainer [2020-12-09 08:22:28,596 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 08:22:28,597 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 08:22:28,597 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 08:22:28,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 08:22:28,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 08:22:28" (1/3) ... [2020-12-09 08:22:28,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1afeece5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 08:22:28, skipping insertion in model container [2020-12-09 08:22:28,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:22:28" (2/3) ... [2020-12-09 08:22:28,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1afeece5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 08:22:28, skipping insertion in model container [2020-12-09 08:22:28,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:22:28" (3/3) ... [2020-12-09 08:22:28,603 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-12-09 08:22:28,617 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 08:22:28,620 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 08:22:28,630 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 08:22:28,650 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 08:22:28,650 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 08:22:28,650 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 08:22:28,650 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 08:22:28,651 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 08:22:28,651 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 08:22:28,651 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 08:22:28,651 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 08:22:28,663 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-12-09 08:22:28,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 08:22:28,666 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:28,666 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:28,667 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:28,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:28,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1615401540, now seen corresponding path program 1 times [2020-12-09 08:22:28,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:28,677 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347260327] [2020-12-09 08:22:28,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:28,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 08:22:28,821 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347260327] [2020-12-09 08:22:28,821 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 08:22:28,822 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 08:22:28,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854298031] [2020-12-09 08:22:28,825 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 08:22:28,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:28,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 08:22:28,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 08:22:28,836 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-12-09 08:22:28,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:28,902 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-12-09 08:22:28,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 08:22:28,904 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-12-09 08:22:28,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:28,910 INFO L225 Difference]: With dead ends: 27 [2020-12-09 08:22:28,910 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 08:22:28,912 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-09 08:22:28,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 08:22:28,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 08:22:28,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 08:22:28,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-09 08:22:28,940 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2020-12-09 08:22:28,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:28,940 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-09 08:22:28,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 08:22:28,940 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-09 08:22:28,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 08:22:28,941 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:28,941 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:28,942 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 08:22:28,942 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:28,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:28,943 INFO L82 PathProgramCache]: Analyzing trace with hash -2136894566, now seen corresponding path program 1 times [2020-12-09 08:22:28,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:28,943 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782587703] [2020-12-09 08:22:28,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:28,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:28,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 08:22:28,985 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782587703] [2020-12-09 08:22:28,986 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 08:22:28,986 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 08:22:28,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322482903] [2020-12-09 08:22:28,987 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 08:22:28,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:28,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 08:22:28,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 08:22:28,989 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 5 states. [2020-12-09 08:22:29,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:29,031 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2020-12-09 08:22:29,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 08:22:29,031 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-09 08:22:29,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:29,032 INFO L225 Difference]: With dead ends: 23 [2020-12-09 08:22:29,033 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 08:22:29,033 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-09 08:22:29,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 08:22:29,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-12-09 08:22:29,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 08:22:29,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-09 08:22:29,039 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2020-12-09 08:22:29,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:29,040 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-09 08:22:29,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 08:22:29,040 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-09 08:22:29,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-09 08:22:29,041 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:29,041 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:29,041 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 08:22:29,041 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:29,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:29,042 INFO L82 PathProgramCache]: Analyzing trace with hash -338238899, now seen corresponding path program 1 times [2020-12-09 08:22:29,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:29,042 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974642215] [2020-12-09 08:22:29,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:29,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:29,102 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 08:22:29,102 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974642215] [2020-12-09 08:22:29,102 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758618506] [2020-12-09 08:22:29,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:29,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:29,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 08:22:29,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 08:22:29,208 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 08:22:29,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 08:22:29,365 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 08:22:29,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457067443] [2020-12-09 08:22:29,387 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 08:22:29,388 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 08:22:29,393 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 08:22:29,393 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 08:22:29,394 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2020-12-09 08:22:29,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477272721] [2020-12-09 08:22:29,395 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-09 08:22:29,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:29,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-09 08:22:29,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-12-09 08:22:29,396 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 12 states. [2020-12-09 08:22:29,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:29,508 INFO L93 Difference]: Finished difference Result 41 states and 59 transitions. [2020-12-09 08:22:29,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 08:22:29,509 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-12-09 08:22:29,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:29,510 INFO L225 Difference]: With dead ends: 41 [2020-12-09 08:22:29,510 INFO L226 Difference]: Without dead ends: 24 [2020-12-09 08:22:29,511 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-12-09 08:22:29,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-09 08:22:29,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-09 08:22:29,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-09 08:22:29,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2020-12-09 08:22:29,515 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 22 [2020-12-09 08:22:29,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:29,516 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2020-12-09 08:22:29,516 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-09 08:22:29,516 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2020-12-09 08:22:29,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-09 08:22:29,517 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:29,518 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:29,718 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-09 08:22:29,719 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:29,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:29,721 INFO L82 PathProgramCache]: Analyzing trace with hash 271867855, now seen corresponding path program 1 times [2020-12-09 08:22:29,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:29,722 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847260559] [2020-12-09 08:22:29,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:29,903 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-12-09 08:22:29,904 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847260559] [2020-12-09 08:22:29,904 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189434995] [2020-12-09 08:22:29,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:29,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:29,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-09 08:22:29,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 08:22:29,992 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-12-09 08:22:29,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 08:22:30,223 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-12-09 08:22:30,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151272266] [2020-12-09 08:22:30,225 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 08:22:30,225 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 08:22:30,226 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 08:22:30,226 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 08:22:30,226 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 12 [2020-12-09 08:22:30,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326706498] [2020-12-09 08:22:30,227 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-09 08:22:30,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:30,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-09 08:22:30,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-12-09 08:22:30,227 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand 12 states. [2020-12-09 08:22:30,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:30,316 INFO L93 Difference]: Finished difference Result 43 states and 73 transitions. [2020-12-09 08:22:30,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 08:22:30,316 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2020-12-09 08:22:30,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:30,319 INFO L225 Difference]: With dead ends: 43 [2020-12-09 08:22:30,319 INFO L226 Difference]: Without dead ends: 37 [2020-12-09 08:22:30,319 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-12-09 08:22:30,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-09 08:22:30,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-12-09 08:22:30,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-09 08:22:30,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 59 transitions. [2020-12-09 08:22:30,327 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 59 transitions. Word has length 50 [2020-12-09 08:22:30,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:30,328 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 59 transitions. [2020-12-09 08:22:30,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-09 08:22:30,328 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 59 transitions. [2020-12-09 08:22:30,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-12-09 08:22:30,331 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:30,332 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:30,532 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:30,533 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:30,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:30,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1320545923, now seen corresponding path program 2 times [2020-12-09 08:22:30,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:30,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905143491] [2020-12-09 08:22:30,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:30,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:30,723 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 64 proven. 158 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2020-12-09 08:22:30,723 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905143491] [2020-12-09 08:22:30,723 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466206783] [2020-12-09 08:22:30,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:30,762 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-09 08:22:30,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 08:22:30,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-09 08:22:30,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 08:22:30,861 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 12 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2020-12-09 08:22:30,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 08:22:31,198 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 14 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2020-12-09 08:22:31,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [708328009] [2020-12-09 08:22:31,200 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 08:22:31,200 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 08:22:31,200 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 08:22:31,201 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 08:22:31,201 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2020-12-09 08:22:31,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77752169] [2020-12-09 08:22:31,202 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-09 08:22:31,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:31,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-09 08:22:31,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-12-09 08:22:31,202 INFO L87 Difference]: Start difference. First operand 34 states and 59 transitions. Second operand 15 states. [2020-12-09 08:22:31,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:31,437 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-12-09 08:22:31,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-09 08:22:31,438 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 103 [2020-12-09 08:22:31,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:31,440 INFO L225 Difference]: With dead ends: 91 [2020-12-09 08:22:31,440 INFO L226 Difference]: Without dead ends: 59 [2020-12-09 08:22:31,443 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 199 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2020-12-09 08:22:31,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-09 08:22:31,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-12-09 08:22:31,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-09 08:22:31,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 82 transitions. [2020-12-09 08:22:31,456 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 82 transitions. Word has length 103 [2020-12-09 08:22:31,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:31,456 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 82 transitions. [2020-12-09 08:22:31,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-09 08:22:31,456 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 82 transitions. [2020-12-09 08:22:31,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-12-09 08:22:31,459 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:31,459 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 15, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:31,660 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:31,661 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:31,662 INFO L82 PathProgramCache]: Analyzing trace with hash -177793588, now seen corresponding path program 3 times [2020-12-09 08:22:31,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:31,663 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054172381] [2020-12-09 08:22:31,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:31,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 08:22:31,809 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 231 proven. 72 refuted. 0 times theorem prover too weak. 458 trivial. 0 not checked. [2020-12-09 08:22:31,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054172381] [2020-12-09 08:22:31,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086262079] [2020-12-09 08:22:31,809 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:31,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 08:22:31,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 08:22:31,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 08:22:31,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 08:22:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 264 proven. 72 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-09 08:22:31,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 08:22:32,600 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 264 proven. 94 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2020-12-09 08:22:32,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392030344] [2020-12-09 08:22:32,602 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 08:22:32,602 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 08:22:32,602 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 08:22:32,602 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 08:22:32,603 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 13] total 17 [2020-12-09 08:22:32,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859247470] [2020-12-09 08:22:32,603 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-09 08:22:32,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 08:22:32,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-09 08:22:32,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2020-12-09 08:22:32,604 INFO L87 Difference]: Start difference. First operand 56 states and 82 transitions. Second operand 17 states. [2020-12-09 08:22:32,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 08:22:32,722 INFO L93 Difference]: Finished difference Result 77 states and 129 transitions. [2020-12-09 08:22:32,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 08:22:32,722 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-12-09 08:22:32,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 08:22:32,724 INFO L225 Difference]: With dead ends: 77 [2020-12-09 08:22:32,724 INFO L226 Difference]: Without dead ends: 60 [2020-12-09 08:22:32,725 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2020-12-09 08:22:32,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-09 08:22:32,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2020-12-09 08:22:32,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-09 08:22:32,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 76 transitions. [2020-12-09 08:22:32,731 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 76 transitions. Word has length 120 [2020-12-09 08:22:32,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 08:22:32,732 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 76 transitions. [2020-12-09 08:22:32,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-09 08:22:32,732 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 76 transitions. [2020-12-09 08:22:32,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-12-09 08:22:32,733 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 08:22:32,733 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2020-12-09 08:22:32,934 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 08:22:32,935 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 08:22:32,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 08:22:32,936 INFO L82 PathProgramCache]: Analyzing trace with hash -82417497, now seen corresponding path program 4 times [2020-12-09 08:22:32,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 08:22:32,937 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365274042] [2020-12-09 08:22:32,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 08:22:33,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 08:22:33,023 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 08:22:33,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 08:22:33,071 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 08:22:33,102 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 08:22:33,102 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 08:22:33,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-09 08:22:33,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 08:22:33 BoogieIcfgContainer [2020-12-09 08:22:33,153 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 08:22:33,153 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 08:22:33,153 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 08:22:33,153 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 08:22:33,154 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:22:28" (3/4) ... [2020-12-09 08:22:33,155 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 08:22:33,204 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a1ac6f39-d4c5-400a-a224-19878c004b6c/bin/utaipan/witness.graphml [2020-12-09 08:22:33,204 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 08:22:33,206 INFO L168 Benchmark]: Toolchain (without parser) took 5032.83 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 79.0 MB in the beginning and 52.7 MB in the end (delta: 26.3 MB). Peak memory consumption was 77.9 MB. Max. memory is 16.1 GB. [2020-12-09 08:22:33,206 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 115.3 MB. Free memory is still 95.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 08:22:33,207 INFO L168 Benchmark]: CACSL2BoogieTranslator took 168.35 ms. Allocated memory is still 115.3 MB. Free memory was 78.9 MB in the beginning and 92.2 MB in the end (delta: -13.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 08:22:33,207 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.69 ms. Allocated memory is still 115.3 MB. Free memory was 92.2 MB in the beginning and 91.1 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 08:22:33,207 INFO L168 Benchmark]: Boogie Preprocessor took 14.50 ms. Allocated memory is still 115.3 MB. Free memory was 90.6 MB in the beginning and 90.2 MB in the end (delta: 468.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 08:22:33,208 INFO L168 Benchmark]: RCFGBuilder took 215.64 ms. Allocated memory is still 115.3 MB. Free memory was 89.7 MB in the beginning and 76.6 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-09 08:22:33,208 INFO L168 Benchmark]: TraceAbstraction took 4555.52 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 76.0 MB in the beginning and 58.0 MB in the end (delta: 18.0 MB). Peak memory consumption was 72.0 MB. Max. memory is 16.1 GB. [2020-12-09 08:22:33,208 INFO L168 Benchmark]: Witness Printer took 51.30 ms. Allocated memory is still 167.8 MB. Free memory was 58.0 MB in the beginning and 52.7 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 08:22:33,216 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 115.3 MB. Free memory is still 95.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 168.35 ms. Allocated memory is still 115.3 MB. Free memory was 78.9 MB in the beginning and 92.2 MB in the end (delta: -13.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 21.69 ms. Allocated memory is still 115.3 MB. Free memory was 92.2 MB in the beginning and 91.1 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 14.50 ms. Allocated memory is still 115.3 MB. Free memory was 90.6 MB in the beginning and 90.2 MB in the end (delta: 468.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 215.64 ms. Allocated memory is still 115.3 MB. Free memory was 89.7 MB in the beginning and 76.6 MB in the end (delta: 13.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4555.52 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 76.0 MB in the beginning and 58.0 MB in the end (delta: 18.0 MB). Peak memory consumption was 72.0 MB. Max. memory is 16.1 GB. * Witness Printer took 51.30 ms. Allocated memory is still 167.8 MB. Free memory was 58.0 MB in the beginning and 52.7 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - 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) [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) [L35] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.4s, OverallIterations: 7, TraceHistogramMax: 17, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 92 SDtfs, 149 SDslu, 258 SDs, 0 SdLazy, 554 SolverSat, 169 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 662 GetRequests, 574 SyntacticMatches, 7 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=5, 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, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 714 NumberOfCodeBlocks, 636 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 890 ConstructedInterpolants, 0 QuantifiedInterpolants, 143704 SizeOfPredicates, 18 NumberOfNonLiveVariables, 570 ConjunctsInSsa, 34 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 3695/4284 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...