./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c -s /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0f8f22ce4f3bf9068fc0240f174785871ced813b .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-02 15:51:29,630 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-02 15:51:29,631 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-02 15:51:29,637 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-02 15:51:29,637 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-02 15:51:29,638 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-02 15:51:29,638 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-02 15:51:29,639 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-02 15:51:29,640 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-02 15:51:29,640 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-02 15:51:29,641 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-02 15:51:29,641 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-02 15:51:29,641 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-02 15:51:29,642 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-02 15:51:29,642 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-02 15:51:29,643 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-02 15:51:29,643 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-02 15:51:29,644 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-02 15:51:29,645 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-02 15:51:29,645 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-02 15:51:29,646 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-02 15:51:29,646 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-02 15:51:29,647 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-02 15:51:29,648 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-02 15:51:29,648 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-02 15:51:29,648 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-02 15:51:29,649 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-02 15:51:29,649 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-02 15:51:29,649 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-02 15:51:29,650 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-02 15:51:29,650 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-02 15:51:29,650 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-02 15:51:29,650 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-02 15:51:29,651 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-02 15:51:29,651 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-02 15:51:29,651 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-02 15:51:29,651 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-02 15:51:29,658 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-02 15:51:29,659 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-02 15:51:29,659 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-02 15:51:29,659 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-02 15:51:29,659 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-02 15:51:29,659 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-02 15:51:29,659 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-02 15:51:29,660 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-02 15:51:29,660 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-02 15:51:29,661 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-02 15:51:29,661 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-02 15:51:29,662 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-02 15:51:29,662 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/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(__VERIFIER_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 -> 0f8f22ce4f3bf9068fc0240f174785871ced813b [2018-12-02 15:51:29,679 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-02 15:51:29,686 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-02 15:51:29,688 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-02 15:51:29,689 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-02 15:51:29,689 INFO L276 PluginConnector]: CDTParser initialized [2018-12-02 15:51:29,690 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/../../sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c [2018-12-02 15:51:29,725 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/data/4af4a2b7e/8f7e2faadb6b4b709ac2b68be6aeb871/FLAG2971f8568 [2018-12-02 15:51:30,065 INFO L307 CDTParser]: Found 1 translation units. [2018-12-02 15:51:30,065 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c [2018-12-02 15:51:30,069 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/data/4af4a2b7e/8f7e2faadb6b4b709ac2b68be6aeb871/FLAG2971f8568 [2018-12-02 15:51:30,451 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/data/4af4a2b7e/8f7e2faadb6b4b709ac2b68be6aeb871 [2018-12-02 15:51:30,452 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-02 15:51:30,453 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-02 15:51:30,454 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-02 15:51:30,454 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-02 15:51:30,456 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-02 15:51:30,456 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,458 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2486db8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30, skipping insertion in model container [2018-12-02 15:51:30,458 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-02 15:51:30,472 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-02 15:51:30,557 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 15:51:30,559 INFO L191 MainTranslator]: Completed pre-run [2018-12-02 15:51:30,568 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 15:51:30,576 INFO L195 MainTranslator]: Completed translation [2018-12-02 15:51:30,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30 WrapperNode [2018-12-02 15:51:30,577 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-02 15:51:30,577 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-02 15:51:30,578 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-02 15:51:30,578 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-02 15:51:30,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,586 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,590 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-02 15:51:30,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-02 15:51:30,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-02 15:51:30,590 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-02 15:51:30,596 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,596 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,596 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,600 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,600 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... [2018-12-02 15:51:30,601 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-02 15:51:30,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-02 15:51:30,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-02 15:51:30,601 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-02 15:51:30,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/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 [2018-12-02 15:51:30,666 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2018-12-02 15:51:30,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2018-12-02 15:51:30,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-02 15:51:30,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-02 15:51:30,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-02 15:51:30,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-02 15:51:30,666 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-02 15:51:30,666 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-02 15:51:30,745 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-02 15:51:30,745 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-02 15:51:30,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:51:30 BoogieIcfgContainer [2018-12-02 15:51:30,745 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-02 15:51:30,746 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-02 15:51:30,746 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-02 15:51:30,747 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-02 15:51:30,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:51:30" (1/3) ... [2018-12-02 15:51:30,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14a29fb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:51:30, skipping insertion in model container [2018-12-02 15:51:30,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:51:30" (2/3) ... [2018-12-02 15:51:30,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14a29fb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:51:30, skipping insertion in model container [2018-12-02 15:51:30,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:51:30" (3/3) ... [2018-12-02 15:51:30,749 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci01_true-unreach-call_true-no-overflow.c [2018-12-02 15:51:30,755 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-02 15:51:30,759 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-02 15:51:30,768 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-02 15:51:30,785 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-02 15:51:30,785 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-02 15:51:30,785 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-02 15:51:30,785 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-02 15:51:30,785 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-02 15:51:30,785 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-02 15:51:30,785 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-02 15:51:30,785 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-02 15:51:30,794 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-12-02 15:51:30,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-02 15:51:30,798 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:30,798 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:30,799 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:30,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:30,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2018-12-02 15:51:30,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:30,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:30,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:30,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:30,831 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:30,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:30,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-02 15:51:30,902 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-02 15:51:30,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-12-02 15:51:30,902 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 15:51:30,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-02 15:51:30,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-02 15:51:30,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-12-02 15:51:30,914 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2018-12-02 15:51:30,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:30,986 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2018-12-02 15:51:30,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-02 15:51:30,987 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2018-12-02 15:51:30,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:30,993 INFO L225 Difference]: With dead ends: 36 [2018-12-02 15:51:30,993 INFO L226 Difference]: Without dead ends: 22 [2018-12-02 15:51:30,995 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-12-02 15:51:31,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-02 15:51:31,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-02 15:51:31,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-02 15:51:31,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2018-12-02 15:51:31,019 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2018-12-02 15:51:31,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:31,020 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2018-12-02 15:51:31,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-02 15:51:31,020 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2018-12-02 15:51:31,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-02 15:51:31,021 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:31,021 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:31,021 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:31,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:31,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2018-12-02 15:51:31,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:31,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:31,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:31,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:31,022 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:31,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:31,075 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-02 15:51:31,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:31,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:31,076 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-12-02 15:51:31,077 INFO L205 CegarAbsIntRunner]: [0], [3], [4], [8], [10], [12], [13], [14], [18], [22], [24], [28], [30], [33], [34], [35], [36], [37], [38], [39], [41], [42] [2018-12-02 15:51:31,096 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-02 15:51:31,097 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-02 15:51:31,264 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-02 15:51:31,265 INFO L272 AbstractInterpreter]: Visited 22 different actions 283 times. Never merged. Never widened. Performed 590 root evaluator evaluations with a maximum evaluation depth of 4. Performed 590 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 32 fixpoints after 3 different actions. Largest state had 5 variables. [2018-12-02 15:51:31,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:31,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-02 15:51:31,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:31,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:31,277 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:31,277 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 15:51:31,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:31,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:31,315 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-02 15:51:31,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:31,380 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-02 15:51:31,395 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-12-02 15:51:31,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 7 [2018-12-02 15:51:31,395 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 15:51:31,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-02 15:51:31,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-02 15:51:31,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-12-02 15:51:31,396 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2018-12-02 15:51:31,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:31,438 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2018-12-02 15:51:31,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-02 15:51:31,438 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2018-12-02 15:51:31,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:31,439 INFO L225 Difference]: With dead ends: 39 [2018-12-02 15:51:31,439 INFO L226 Difference]: Without dead ends: 24 [2018-12-02 15:51:31,440 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-02 15:51:31,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-02 15:51:31,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-02 15:51:31,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-02 15:51:31,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2018-12-02 15:51:31,443 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2018-12-02 15:51:31,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:31,443 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2018-12-02 15:51:31,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-02 15:51:31,444 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2018-12-02 15:51:31,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-02 15:51:31,444 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:31,444 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:31,445 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:31,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:31,445 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2018-12-02 15:51:31,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:31,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:31,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:31,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:31,446 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:31,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:31,512 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-02 15:51:31,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:31,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:31,512 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 29 with the following transitions: [2018-12-02 15:51:31,512 INFO L205 CegarAbsIntRunner]: [0], [3], [4], [7], [8], [10], [12], [13], [14], [18], [22], [24], [28], [30], [33], [34], [35], [36], [37], [38], [39], [41], [42] [2018-12-02 15:51:31,513 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-02 15:51:31,513 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-02 15:51:32,277 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-02 15:51:32,278 INFO L272 AbstractInterpreter]: Visited 23 different actions 4125 times. Merged at 10 different actions 1357 times. Never widened. Performed 10160 root evaluator evaluations with a maximum evaluation depth of 4. Performed 10160 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 592 fixpoints after 6 different actions. Largest state had 5 variables. [2018-12-02 15:51:32,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:32,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-02 15:51:32,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:32,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:32,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:32,285 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 15:51:32,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:32,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:32,400 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-12-02 15:51:32,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:32,560 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-02 15:51:32,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 15:51:32,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 18 [2018-12-02 15:51:32,584 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 15:51:32,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-02 15:51:32,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-02 15:51:32,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2018-12-02 15:51:32,585 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 16 states. [2018-12-02 15:51:32,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:32,707 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2018-12-02 15:51:32,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-02 15:51:32,707 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 28 [2018-12-02 15:51:32,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:32,708 INFO L225 Difference]: With dead ends: 34 [2018-12-02 15:51:32,708 INFO L226 Difference]: Without dead ends: 30 [2018-12-02 15:51:32,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-12-02 15:51:32,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-02 15:51:32,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-12-02 15:51:32,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-02 15:51:32,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2018-12-02 15:51:32,713 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2018-12-02 15:51:32,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:32,713 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2018-12-02 15:51:32,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-02 15:51:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2018-12-02 15:51:32,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-02 15:51:32,714 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:32,714 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:32,714 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:32,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:32,714 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 2 times [2018-12-02 15:51:32,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:32,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:32,715 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:32,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:32,715 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:32,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:32,775 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-12-02 15:51:32,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:32,776 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:32,776 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 15:51:32,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 15:51:32,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:32,776 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:32,782 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 15:51:32,782 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 15:51:32,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-02 15:51:32,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 15:51:32,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:32,915 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-12-02 15:51:32,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:33,195 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-12-02 15:51:33,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 15:51:33,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 14] total 27 [2018-12-02 15:51:33,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 15:51:33,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-02 15:51:33,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-02 15:51:33,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2018-12-02 15:51:33,210 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 19 states. [2018-12-02 15:51:33,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:33,459 INFO L93 Difference]: Finished difference Result 57 states and 82 transitions. [2018-12-02 15:51:33,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-02 15:51:33,459 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2018-12-02 15:51:33,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:33,460 INFO L225 Difference]: With dead ends: 57 [2018-12-02 15:51:33,460 INFO L226 Difference]: Without dead ends: 35 [2018-12-02 15:51:33,460 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=279, Invalid=1281, Unknown=0, NotChecked=0, Total=1560 [2018-12-02 15:51:33,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-12-02 15:51:33,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2018-12-02 15:51:33,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-02 15:51:33,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2018-12-02 15:51:33,464 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 41 [2018-12-02 15:51:33,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:33,465 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2018-12-02 15:51:33,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-02 15:51:33,465 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2018-12-02 15:51:33,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-02 15:51:33,465 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:33,465 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:33,465 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:33,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:33,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 3 times [2018-12-02 15:51:33,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:33,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:33,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 15:51:33,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:33,466 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:33,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:33,543 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 25 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-02 15:51:33,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:33,543 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:33,543 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 15:51:33,543 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 15:51:33,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:33,543 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:33,549 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 15:51:33,549 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 15:51:33,559 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 15:51:33,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 15:51:33,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:33,651 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-02 15:51:33,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:33,983 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-12-02 15:51:33,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 15:51:33,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16] total 27 [2018-12-02 15:51:33,998 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 15:51:33,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-02 15:51:33,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-02 15:51:33,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2018-12-02 15:51:33,999 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 22 states. [2018-12-02 15:51:34,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:34,281 INFO L93 Difference]: Finished difference Result 49 states and 74 transitions. [2018-12-02 15:51:34,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-02 15:51:34,281 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-12-02 15:51:34,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:34,282 INFO L225 Difference]: With dead ends: 49 [2018-12-02 15:51:34,282 INFO L226 Difference]: Without dead ends: 43 [2018-12-02 15:51:34,282 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 62 SyntacticMatches, 11 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=1422, Unknown=0, NotChecked=0, Total=1722 [2018-12-02 15:51:34,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-02 15:51:34,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2018-12-02 15:51:34,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-02 15:51:34,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 54 transitions. [2018-12-02 15:51:34,287 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 54 transitions. Word has length 42 [2018-12-02 15:51:34,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:34,287 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 54 transitions. [2018-12-02 15:51:34,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-02 15:51:34,287 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 54 transitions. [2018-12-02 15:51:34,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-02 15:51:34,289 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:34,289 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:34,289 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:34,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:34,289 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 4 times [2018-12-02 15:51:34,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:34,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:34,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 15:51:34,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:34,290 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:34,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:34,363 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 176 proven. 28 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2018-12-02 15:51:34,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:34,363 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:34,363 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 15:51:34,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 15:51:34,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:34,363 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:34,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:34,369 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 15:51:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:34,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:34,425 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 93 proven. 162 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2018-12-02 15:51:34,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 92 proven. 171 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2018-12-02 15:51:34,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 15:51:34,772 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 14] total 21 [2018-12-02 15:51:34,772 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 15:51:34,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-02 15:51:34,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-02 15:51:34,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2018-12-02 15:51:34,773 INFO L87 Difference]: Start difference. First operand 37 states and 54 transitions. Second operand 15 states. [2018-12-02 15:51:34,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:34,925 INFO L93 Difference]: Finished difference Result 79 states and 136 transitions. [2018-12-02 15:51:34,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-02 15:51:34,926 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 97 [2018-12-02 15:51:34,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:34,926 INFO L225 Difference]: With dead ends: 79 [2018-12-02 15:51:34,926 INFO L226 Difference]: Without dead ends: 49 [2018-12-02 15:51:34,927 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 173 SyntacticMatches, 12 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=675, Unknown=0, NotChecked=0, Total=930 [2018-12-02 15:51:34,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-02 15:51:34,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-12-02 15:51:34,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-02 15:51:34,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2018-12-02 15:51:34,931 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 97 [2018-12-02 15:51:34,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:34,931 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2018-12-02 15:51:34,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-02 15:51:34,931 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2018-12-02 15:51:34,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-02 15:51:34,932 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 15:51:34,932 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 15:51:34,932 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 15:51:34,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 15:51:34,932 INFO L82 PathProgramCache]: Analyzing trace with hash -865837754, now seen corresponding path program 5 times [2018-12-02 15:51:34,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 15:51:34,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:34,933 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 15:51:34,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 15:51:34,933 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 15:51:34,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 15:51:35,016 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-12-02 15:51:35,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:35,016 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 15:51:35,016 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 15:51:35,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 15:51:35,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 15:51:35,016 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 15:51:35,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 15:51:35,023 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 15:51:35,036 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-02 15:51:35,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 15:51:35,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 15:51:35,172 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 74 proven. 40 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2018-12-02 15:51:35,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 15:51:35,743 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 58 proven. 63 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2018-12-02 15:51:35,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 15:51:35,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 18, 20] total 32 [2018-12-02 15:51:35,758 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 15:51:35,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-02 15:51:35,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-02 15:51:35,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2018-12-02 15:51:35,758 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand 26 states. [2018-12-02 15:51:35,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 15:51:35,975 INFO L93 Difference]: Finished difference Result 51 states and 62 transitions. [2018-12-02 15:51:35,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-02 15:51:35,975 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2018-12-02 15:51:35,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 15:51:35,976 INFO L225 Difference]: With dead ends: 51 [2018-12-02 15:51:35,976 INFO L226 Difference]: Without dead ends: 0 [2018-12-02 15:51:35,976 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 113 SyntacticMatches, 18 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=294, Invalid=1598, Unknown=0, NotChecked=0, Total=1892 [2018-12-02 15:51:35,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-02 15:51:35,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-02 15:51:35,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-02 15:51:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-02 15:51:35,977 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2018-12-02 15:51:35,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 15:51:35,977 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-02 15:51:35,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-02 15:51:35,977 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-02 15:51:35,977 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-02 15:51:35,980 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-02 15:51:36,078 INFO L448 ceAbstractionStarter]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2018-12-02 15:51:36,078 INFO L451 ceAbstractionStarter]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2018-12-02 15:51:36,078 INFO L444 ceAbstractionStarter]: At program point L20(line 20) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (< 1 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2018-12-02 15:51:36,078 INFO L448 ceAbstractionStarter]: For program point L20-1(line 20) no Hoare annotation was computed. [2018-12-02 15:51:36,078 INFO L444 ceAbstractionStarter]: At program point L20-2(line 20) the Hoare annotation is: (let ((.cse1 (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 2))) (.cse0 (<= fibonacci_~n |fibonacci_#in~n|))) (or (and (<= 1 |fibonacci_#t~ret0|) (<= |fibonacci_#in~n| 2) (<= 2 fibonacci_~n) .cse0) (and (<= 4 fibonacci_~n) (<= |fibonacci_#in~n| fibonacci_~n) .cse1 .cse0) (and (<= |fibonacci_#in~n| 3) .cse1 (<= 3 fibonacci_~n) .cse0))) [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L17(lines 17 21) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L20-3(line 20) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 21) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-02 15:51:36,079 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L31(lines 31 35) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L451 ceAbstractionStarter]: At program point L30(line 30) the Hoare annotation is: true [2018-12-02 15:51:36,079 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L30-1(line 30) no Hoare annotation was computed. [2018-12-02 15:51:36,079 INFO L448 ceAbstractionStarter]: For program point L27(lines 27 29) no Hoare annotation was computed. [2018-12-02 15:51:36,080 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2018-12-02 15:51:36,080 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2018-12-02 15:51:36,080 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2018-12-02 15:51:36,080 INFO L448 ceAbstractionStarter]: For program point L34(line 34) no Hoare annotation was computed. [2018-12-02 15:51:36,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 03:51:36 BoogieIcfgContainer [2018-12-02 15:51:36,081 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-02 15:51:36,082 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-02 15:51:36,082 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-02 15:51:36,082 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-02 15:51:36,082 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:51:30" (3/4) ... [2018-12-02 15:51:36,084 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-02 15:51:36,088 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibonacci [2018-12-02 15:51:36,088 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-02 15:51:36,088 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-02 15:51:36,090 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-02 15:51:36,090 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-02 15:51:36,090 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-02 15:51:36,115 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_12dfcfdb-5dee-4d8f-a502-ba9ad124e2d9/bin-2019/utaipan/witness.graphml [2018-12-02 15:51:36,115 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-02 15:51:36,115 INFO L168 Benchmark]: Toolchain (without parser) took 5662.77 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 206.0 MB). Free memory was 952.5 MB in the beginning and 1.2 GB in the end (delta: -216.6 MB). There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 15:51:36,116 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 15:51:36,116 INFO L168 Benchmark]: CACSL2BoogieTranslator took 123.32 ms. Allocated memory is still 1.0 GB. Free memory was 952.5 MB in the beginning and 941.7 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2018-12-02 15:51:36,117 INFO L168 Benchmark]: Boogie Procedure Inliner took 12.31 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 15:51:36,117 INFO L168 Benchmark]: Boogie Preprocessor took 11.00 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 15:51:36,117 INFO L168 Benchmark]: RCFGBuilder took 144.31 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 116.9 MB). Free memory was 941.7 MB in the beginning and 1.1 GB in the end (delta: -156.8 MB). Peak memory consumption was 15.5 MB. Max. memory is 11.5 GB. [2018-12-02 15:51:36,117 INFO L168 Benchmark]: TraceAbstraction took 5335.61 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 89.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -70.6 MB). Peak memory consumption was 18.6 MB. Max. memory is 11.5 GB. [2018-12-02 15:51:36,117 INFO L168 Benchmark]: Witness Printer took 33.35 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 15:51:36,119 INFO L336 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 1.0 GB. Free memory is still 978.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 123.32 ms. Allocated memory is still 1.0 GB. Free memory was 952.5 MB in the beginning and 941.7 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 12.31 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 11.00 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 144.31 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 116.9 MB). Free memory was 941.7 MB in the beginning and 1.1 GB in the end (delta: -156.8 MB). Peak memory consumption was 15.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5335.61 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 89.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -70.6 MB). Peak memory consumption was 18.6 MB. Max. memory is 11.5 GB. * Witness Printer took 33.35 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. SAFE Result, 5.3s OverallTime, 7 OverallIterations, 13 TraceHistogramMax, 1.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 128 SDtfs, 151 SDslu, 722 SDs, 0 SdLazy, 1203 SolverSat, 237 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 747 GetRequests, 502 SyntacticMatches, 62 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1703 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.9s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 16 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 53 PreInvPairs, 68 NumberOfFragments, 61 HoareAnnotationTreeSize, 53 FomulaSimplifications, 139 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 235 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 2.6s InterpolantComputationTime, 622 NumberOfCodeBlocks, 614 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 907 ConstructedInterpolants, 0 QuantifiedInterpolants, 140110 SizeOfPredicates, 32 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 94 ConjunctsInUnsatCore, 19 InterpolantComputations, 2 PerfectInterpolantSequences, 1499/2214 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...