./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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-a4ecdab [2020-11-30 02:18:40,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 02:18:40,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 02:18:40,333 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 02:18:40,345 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 02:18:40,346 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 02:18:40,348 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 02:18:40,352 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 02:18:40,354 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 02:18:40,355 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 02:18:40,357 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 02:18:40,359 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 02:18:40,359 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 02:18:40,361 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 02:18:40,362 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 02:18:40,364 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 02:18:40,365 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 02:18:40,366 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 02:18:40,369 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 02:18:40,371 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 02:18:40,373 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 02:18:40,375 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 02:18:40,377 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 02:18:40,378 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 02:18:40,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 02:18:40,383 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 02:18:40,383 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 02:18:40,385 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 02:18:40,386 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 02:18:40,387 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 02:18:40,387 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 02:18:40,389 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 02:18:40,390 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 02:18:40,391 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 02:18:40,392 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 02:18:40,393 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 02:18:40,394 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 02:18:40,395 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 02:18:40,396 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 02:18:40,398 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 02:18:40,399 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 02:18:40,401 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 02:18:40,441 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 02:18:40,442 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 02:18:40,443 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 02:18:40,444 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 02:18:40,444 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 02:18:40,444 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 02:18:40,445 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 02:18:40,445 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 02:18:40,445 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 02:18:40,445 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 02:18:40,446 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 02:18:40,447 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 02:18:40,447 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 02:18:40,447 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 02:18:40,448 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 02:18:40,448 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 02:18:40,449 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 02:18:40,449 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 02:18:40,449 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 02:18:40,449 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 02:18:40,450 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 02:18:40,450 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 02:18:40,450 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 02:18:40,450 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 02:18:40,450 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 02:18:40,451 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 02:18:40,451 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 02:18:40,451 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 02:18:40,451 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 02:18:40,453 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 02:18:40,453 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 02:18:40,453 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:18:40,453 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 02:18:40,454 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 02:18:40,454 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 02:18:40,454 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 02:18:40,454 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 02:18:40,455 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 02:18:40,455 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 02:18:40,455 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 02:18:40,455 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_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db54bc93f5615de8b0a803193005d14234c84165 [2020-11-30 02:18:40,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 02:18:40,730 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 02:18:40,733 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 02:18:40,734 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 02:18:40,735 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 02:18:40,736 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/../../sv-benchmarks/c/recursive/Fibonacci04.c [2020-11-30 02:18:40,814 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/data/8cb34867d/01dbf4c2e9934ac79eddd8e405dd7f1a/FLAG11bfc3fdd [2020-11-30 02:18:41,424 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 02:18:41,425 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/sv-benchmarks/c/recursive/Fibonacci04.c [2020-11-30 02:18:41,437 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/data/8cb34867d/01dbf4c2e9934ac79eddd8e405dd7f1a/FLAG11bfc3fdd [2020-11-30 02:18:41,767 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/data/8cb34867d/01dbf4c2e9934ac79eddd8e405dd7f1a [2020-11-30 02:18:41,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 02:18:41,772 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 02:18:41,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 02:18:41,775 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 02:18:41,778 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 02:18:41,779 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:18:41" (1/1) ... [2020-11-30 02:18:41,782 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@184d7f84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:41, skipping insertion in model container [2020-11-30 02:18:41,782 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:18:41" (1/1) ... [2020-11-30 02:18:41,790 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 02:18:41,804 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 02:18:42,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:18:42,058 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 02:18:42,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:18:42,090 INFO L208 MainTranslator]: Completed translation [2020-11-30 02:18:42,091 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42 WrapperNode [2020-11-30 02:18:42,091 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 02:18:42,093 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 02:18:42,093 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 02:18:42,093 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 02:18:42,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,110 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,128 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 02:18:42,129 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 02:18:42,129 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 02:18:42,129 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 02:18:42,138 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,140 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,140 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,144 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,146 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,148 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... [2020-11-30 02:18:42,149 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 02:18:42,151 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 02:18:42,151 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 02:18:42,151 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 02:18:42,152 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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 [2020-11-30 02:18:42,232 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-11-30 02:18:42,233 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-11-30 02:18:42,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 02:18:42,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 02:18:42,233 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 02:18:42,234 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 02:18:42,603 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 02:18:42,603 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-30 02:18:42,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:18:42 BoogieIcfgContainer [2020-11-30 02:18:42,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 02:18:42,607 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 02:18:42,607 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 02:18:42,625 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 02:18:42,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 02:18:41" (1/3) ... [2020-11-30 02:18:42,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dd9c6df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:18:42, skipping insertion in model container [2020-11-30 02:18:42,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:18:42" (2/3) ... [2020-11-30 02:18:42,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dd9c6df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:18:42, skipping insertion in model container [2020-11-30 02:18:42,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:18:42" (3/3) ... [2020-11-30 02:18:42,636 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-11-30 02:18:42,648 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 02:18:42,652 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 02:18:42,666 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 02:18:42,694 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 02:18:42,694 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 02:18:42,694 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 02:18:42,695 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 02:18:42,695 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 02:18:42,695 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 02:18:42,695 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 02:18:42,695 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 02:18:42,713 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-11-30 02:18:42,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-30 02:18:42,719 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:42,720 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:42,721 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:42,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:42,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1744630214, now seen corresponding path program 1 times [2020-11-30 02:18:42,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:42,740 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099118715] [2020-11-30 02:18:42,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:42,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:43,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:18:43,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099118715] [2020-11-30 02:18:43,023 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:18:43,023 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-30 02:18:43,024 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98494457] [2020-11-30 02:18:43,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-30 02:18:43,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:43,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-30 02:18:43,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-30 02:18:43,055 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-11-30 02:18:43,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:43,192 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-11-30 02:18:43,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-30 02:18:43,194 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-30 02:18:43,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:43,203 INFO L225 Difference]: With dead ends: 27 [2020-11-30 02:18:43,203 INFO L226 Difference]: Without dead ends: 17 [2020-11-30 02:18:43,206 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-30 02:18:43,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-11-30 02:18:43,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-11-30 02:18:43,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-30 02:18:43,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-11-30 02:18:43,257 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2020-11-30 02:18:43,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:43,258 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-11-30 02:18:43,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-30 02:18:43,258 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-11-30 02:18:43,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 02:18:43,261 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:43,261 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:43,261 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 02:18:43,262 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:43,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:43,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1849803624, now seen corresponding path program 1 times [2020-11-30 02:18:43,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:43,266 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921866926] [2020-11-30 02:18:43,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:43,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:18:43,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921866926] [2020-11-30 02:18:43,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:18:43,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-30 02:18:43,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313282557] [2020-11-30 02:18:43,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-30 02:18:43,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:43,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-30 02:18:43,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-30 02:18:43,355 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 5 states. [2020-11-30 02:18:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:43,462 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2020-11-30 02:18:43,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-30 02:18:43,464 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-30 02:18:43,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:43,465 INFO L225 Difference]: With dead ends: 23 [2020-11-30 02:18:43,465 INFO L226 Difference]: Without dead ends: 19 [2020-11-30 02:18:43,467 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 [2020-11-30 02:18:43,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-30 02:18:43,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-11-30 02:18:43,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-30 02:18:43,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-11-30 02:18:43,480 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2020-11-30 02:18:43,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:43,480 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-11-30 02:18:43,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-30 02:18:43,481 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-11-30 02:18:43,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-30 02:18:43,484 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:43,485 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:43,485 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 02:18:43,485 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:43,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:43,487 INFO L82 PathProgramCache]: Analyzing trace with hash 604295251, now seen corresponding path program 1 times [2020-11-30 02:18:43,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:43,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562024523] [2020-11-30 02:18:43,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:43,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:43,663 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 02:18:43,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562024523] [2020-11-30 02:18:43,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464868014] [2020-11-30 02:18:43,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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 [2020-11-30 02:18:43,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:43,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 02:18:43,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:18:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 02:18:43,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:18:44,223 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-30 02:18:44,230 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-30 02:18:44,290 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-30 02:18:44,291 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649686567] [2020-11-30 02:18:44,315 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-30 02:18:44,316 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:18:44,322 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-30 02:18:44,329 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:18:44,329 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2020-11-30 02:18:44,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453026420] [2020-11-30 02:18:44,331 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-30 02:18:44,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:44,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-30 02:18:44,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-30 02:18:44,335 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 12 states. [2020-11-30 02:18:44,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:44,642 INFO L93 Difference]: Finished difference Result 41 states and 59 transitions. [2020-11-30 02:18:44,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 02:18:44,643 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-11-30 02:18:44,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:44,645 INFO L225 Difference]: With dead ends: 41 [2020-11-30 02:18:44,645 INFO L226 Difference]: Without dead ends: 24 [2020-11-30 02:18:44,646 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-11-30 02:18:44,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-30 02:18:44,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-30 02:18:44,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-30 02:18:44,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2020-11-30 02:18:44,666 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 22 [2020-11-30 02:18:44,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:44,667 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2020-11-30 02:18:44,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-30 02:18:44,667 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2020-11-30 02:18:44,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-11-30 02:18:44,673 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:44,674 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:44,902 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-30 02:18:44,902 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:44,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:44,903 INFO L82 PathProgramCache]: Analyzing trace with hash 313016909, now seen corresponding path program 1 times [2020-11-30 02:18:44,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:44,903 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439223426] [2020-11-30 02:18:44,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:44,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:45,103 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-11-30 02:18:45,105 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439223426] [2020-11-30 02:18:45,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292599208] [2020-11-30 02:18:45,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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 [2020-11-30 02:18:45,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:45,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-30 02:18:45,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:18:45,269 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-11-30 02:18:45,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:18:45,815 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-11-30 02:18:45,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903947901] [2020-11-30 02:18:45,818 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-30 02:18:45,819 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:18:45,819 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-30 02:18:45,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:18:45,820 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 12 [2020-11-30 02:18:45,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163898887] [2020-11-30 02:18:45,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-30 02:18:45,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:45,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-30 02:18:45,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-11-30 02:18:45,822 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand 12 states. [2020-11-30 02:18:46,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:46,081 INFO L93 Difference]: Finished difference Result 43 states and 73 transitions. [2020-11-30 02:18:46,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 02:18:46,082 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2020-11-30 02:18:46,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:46,090 INFO L225 Difference]: With dead ends: 43 [2020-11-30 02:18:46,090 INFO L226 Difference]: Without dead ends: 37 [2020-11-30 02:18:46,091 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 93 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-11-30 02:18:46,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-30 02:18:46,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-11-30 02:18:46,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-30 02:18:46,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 59 transitions. [2020-11-30 02:18:46,110 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 59 transitions. Word has length 50 [2020-11-30 02:18:46,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:46,111 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 59 transitions. [2020-11-30 02:18:46,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-30 02:18:46,112 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 59 transitions. [2020-11-30 02:18:46,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-11-30 02:18:46,120 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:46,120 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:46,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:18:46,330 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:46,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:46,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1800968785, now seen corresponding path program 2 times [2020-11-30 02:18:46,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:46,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356044685] [2020-11-30 02:18:46,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:46,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:46,578 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 64 proven. 158 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2020-11-30 02:18:46,578 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356044685] [2020-11-30 02:18:46,578 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085012997] [2020-11-30 02:18:46,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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 [2020-11-30 02:18:46,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-11-30 02:18:46,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:18:46,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-30 02:18:46,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:18:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 12 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2020-11-30 02:18:46,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:18:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 14 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2020-11-30 02:18:47,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1508585531] [2020-11-30 02:18:47,615 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-30 02:18:47,620 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:18:47,621 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-30 02:18:47,622 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:18:47,622 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2020-11-30 02:18:47,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109067751] [2020-11-30 02:18:47,625 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-30 02:18:47,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:47,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-30 02:18:47,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-11-30 02:18:47,627 INFO L87 Difference]: Start difference. First operand 34 states and 59 transitions. Second operand 15 states. [2020-11-30 02:18:48,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:48,185 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-11-30 02:18:48,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-30 02:18:48,186 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 103 [2020-11-30 02:18:48,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:48,188 INFO L225 Difference]: With dead ends: 91 [2020-11-30 02:18:48,189 INFO L226 Difference]: Without dead ends: 59 [2020-11-30 02:18:48,192 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 196 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2020-11-30 02:18:48,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-11-30 02:18:48,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-11-30 02:18:48,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-30 02:18:48,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 82 transitions. [2020-11-30 02:18:48,228 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 82 transitions. Word has length 103 [2020-11-30 02:18:48,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:48,229 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 82 transitions. [2020-11-30 02:18:48,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-30 02:18:48,229 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 82 transitions. [2020-11-30 02:18:48,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-11-30 02:18:48,234 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:48,235 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 15, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:48,437 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:18:48,437 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:48,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:48,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1390116750, now seen corresponding path program 3 times [2020-11-30 02:18:48,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:48,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760466535] [2020-11-30 02:18:48,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:48,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:18:48,752 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 230 proven. 73 refuted. 0 times theorem prover too weak. 458 trivial. 0 not checked. [2020-11-30 02:18:48,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760466535] [2020-11-30 02:18:48,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809257964] [2020-11-30 02:18:48,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/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 [2020-11-30 02:18:48,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:18:48,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:18:48,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-30 02:18:48,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:18:48,948 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 264 proven. 72 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-11-30 02:18:48,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:18:50,331 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 264 proven. 94 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2020-11-30 02:18:50,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94234477] [2020-11-30 02:18:50,338 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-30 02:18:50,339 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:18:50,339 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) 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) [2020-11-30 02:18:50,340 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:18:50,340 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 13] total 16 [2020-11-30 02:18:50,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457855268] [2020-11-30 02:18:50,343 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-30 02:18:50,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:18:50,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-30 02:18:50,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2020-11-30 02:18:50,345 INFO L87 Difference]: Start difference. First operand 56 states and 82 transitions. Second operand 16 states. [2020-11-30 02:18:50,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:18:50,587 INFO L93 Difference]: Finished difference Result 73 states and 125 transitions. [2020-11-30 02:18:50,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 02:18:50,590 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 120 [2020-11-30 02:18:50,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:18:50,592 INFO L225 Difference]: With dead ends: 73 [2020-11-30 02:18:50,592 INFO L226 Difference]: Without dead ends: 56 [2020-11-30 02:18:50,593 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 227 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2020-11-30 02:18:50,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-11-30 02:18:50,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-11-30 02:18:50,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-30 02:18:50,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 76 transitions. [2020-11-30 02:18:50,606 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 76 transitions. Word has length 120 [2020-11-30 02:18:50,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:18:50,607 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 76 transitions. [2020-11-30 02:18:50,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-30 02:18:50,608 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 76 transitions. [2020-11-30 02:18:50,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-11-30 02:18:50,611 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:18:50,611 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2020-11-30 02:18:50,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:18:50,826 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:18:50,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:18:50,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1288562779, now seen corresponding path program 4 times [2020-11-30 02:18:50,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:18:50,827 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755692148] [2020-11-30 02:18:50,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:18:50,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 02:18:50,863 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 02:18:50,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 02:18:50,891 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 02:18:50,926 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 02:18:50,927 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 02:18:50,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-30 02:18:51,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 02:18:51 BoogieIcfgContainer [2020-11-30 02:18:51,038 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 02:18:51,039 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 02:18:51,039 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 02:18:51,039 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 02:18:51,040 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:18:42" (3/4) ... [2020-11-30 02:18:51,042 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 02:18:51,167 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_b072fb4b-1604-4c0b-9a20-a09b34d85e8d/bin/utaipan/witness.graphml [2020-11-30 02:18:51,168 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 02:18:51,169 INFO L168 Benchmark]: Toolchain (without parser) took 9396.50 ms. Allocated memory was 115.3 MB in the beginning and 169.9 MB in the end (delta: 54.5 MB). Free memory was 83.2 MB in the beginning and 87.8 MB in the end (delta: -4.6 MB). Peak memory consumption was 49.9 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,172 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 79.7 MB. Free memory was 36.2 MB in the beginning and 36.2 MB in the end (delta: 63.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:18:51,172 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.72 ms. Allocated memory is still 115.3 MB. Free memory was 82.8 MB in the beginning and 91.5 MB in the end (delta: -8.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,172 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.18 ms. Allocated memory is still 115.3 MB. Free memory was 91.5 MB in the beginning and 89.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,173 INFO L168 Benchmark]: Boogie Preprocessor took 21.21 ms. Allocated memory is still 115.3 MB. Free memory was 89.9 MB in the beginning and 89.0 MB in the end (delta: 927.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:18:51,173 INFO L168 Benchmark]: RCFGBuilder took 455.27 ms. Allocated memory is still 115.3 MB. Free memory was 89.0 MB in the beginning and 75.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,174 INFO L168 Benchmark]: TraceAbstraction took 8430.98 ms. Allocated memory was 115.3 MB in the beginning and 169.9 MB in the end (delta: 54.5 MB). Free memory was 75.2 MB in the beginning and 94.1 MB in the end (delta: -18.9 MB). Peak memory consumption was 36.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,174 INFO L168 Benchmark]: Witness Printer took 129.16 ms. Allocated memory is still 169.9 MB. Free memory was 94.1 MB in the beginning and 87.8 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-30 02:18:51,176 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 79.7 MB. Free memory was 36.2 MB in the beginning and 36.2 MB in the end (delta: 63.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 317.72 ms. Allocated memory is still 115.3 MB. Free memory was 82.8 MB in the beginning and 91.5 MB in the end (delta: -8.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 35.18 ms. Allocated memory is still 115.3 MB. Free memory was 91.5 MB in the beginning and 89.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.21 ms. Allocated memory is still 115.3 MB. Free memory was 89.9 MB in the beginning and 89.0 MB in the end (delta: 927.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 455.27 ms. Allocated memory is still 115.3 MB. Free memory was 89.0 MB in the beginning and 75.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8430.98 ms. Allocated memory was 115.3 MB in the beginning and 169.9 MB in the end (delta: 54.5 MB). Free memory was 75.2 MB in the beginning and 94.1 MB in the end (delta: -18.9 MB). Peak memory consumption was 36.1 MB. Max. memory is 16.1 GB. * Witness Printer took 129.16 ms. Allocated memory is still 169.9 MB. Free memory was 94.1 MB in the beginning and 87.8 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_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) [L3] __assert_fail("0", "Fibonacci04.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.2s, OverallIterations: 7, TraceHistogramMax: 17, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 93 SDtfs, 146 SDslu, 263 SDs, 0 SdLazy, 556 SolverSat, 162 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 661 GetRequests, 557 SyntacticMatches, 23 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.5s 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: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 4.4s InterpolantComputationTime, 714 NumberOfCodeBlocks, 636 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 890 ConstructedInterpolants, 0 QuantifiedInterpolants, 142276 SizeOfPredicates, 21 NumberOfNonLiveVariables, 570 ConjunctsInSsa, 34 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 3694/4284 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...