./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 aa418289 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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-aa41828 [2018-11-23 12:59:33,012 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 12:59:33,013 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 12:59:33,019 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 12:59:33,020 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 12:59:33,020 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 12:59:33,021 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 12:59:33,022 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 12:59:33,024 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 12:59:33,024 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 12:59:33,025 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 12:59:33,025 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 12:59:33,026 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 12:59:33,026 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 12:59:33,027 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 12:59:33,028 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 12:59:33,029 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 12:59:33,030 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 12:59:33,031 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 12:59:33,032 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 12:59:33,033 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 12:59:33,034 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 12:59:33,036 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 12:59:33,036 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 12:59:33,036 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 12:59:33,037 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 12:59:33,038 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 12:59:33,038 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 12:59:33,039 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 12:59:33,039 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 12:59:33,040 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 12:59:33,040 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 12:59:33,040 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 12:59:33,040 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 12:59:33,041 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 12:59:33,042 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 12:59:33,042 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-23 12:59:33,052 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 12:59:33,052 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 12:59:33,053 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-23 12:59:33,053 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-23 12:59:33,053 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-23 12:59:33,053 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-23 12:59:33,053 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-23 12:59:33,053 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-23 12:59:33,054 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-23 12:59:33,054 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-23 12:59:33,054 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-23 12:59:33,054 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-23 12:59:33,054 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-23 12:59:33,055 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 12:59:33,055 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-23 12:59:33,055 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 12:59:33,055 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-23 12:59:33,055 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 12:59:33,055 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 12:59:33,056 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-23 12:59:33,056 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 12:59:33,057 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-23 12:59:33,057 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-23 12:59:33,058 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-23 12:59:33,058 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-23 12:59:33,058 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-23 12:59:33,058 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-23 12:59:33,058 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_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:33,084 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 12:59:33,093 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 12:59:33,096 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 12:59:33,097 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 12:59:33,097 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 12:59:33,098 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/../../sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c [2018-11-23 12:59:33,134 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/data/b75b17dc8/97e08fc41b94487abf1520ca0140fcff/FLAG2172e6c6e [2018-11-23 12:59:33,524 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 12:59:33,525 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/sv-benchmarks/c/recursive/Fibonacci01_true-unreach-call_true-no-overflow.c [2018-11-23 12:59:33,528 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/data/b75b17dc8/97e08fc41b94487abf1520ca0140fcff/FLAG2172e6c6e [2018-11-23 12:59:33,537 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/data/b75b17dc8/97e08fc41b94487abf1520ca0140fcff [2018-11-23 12:59:33,539 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 12:59:33,539 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-23 12:59:33,540 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 12:59:33,540 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 12:59:33,542 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 12:59:33,543 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,544 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@185b5111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33, skipping insertion in model container [2018-11-23 12:59:33,544 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,550 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 12:59:33,562 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 12:59:33,665 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 12:59:33,667 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 12:59:33,676 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 12:59:33,685 INFO L195 MainTranslator]: Completed translation [2018-11-23 12:59:33,685 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33 WrapperNode [2018-11-23 12:59:33,685 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 12:59:33,685 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 12:59:33,685 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 12:59:33,686 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 12:59:33,691 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,694 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,697 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 12:59:33,697 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 12:59:33,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 12:59:33,698 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 12:59:33,703 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,703 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,704 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,704 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,706 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,707 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,707 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... [2018-11-23 12:59:33,708 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 12:59:33,708 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 12:59:33,708 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 12:59:33,708 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 12:59:33,709 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:33,791 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2018-11-23 12:59:33,791 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2018-11-23 12:59:33,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-23 12:59:33,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-23 12:59:33,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 12:59:33,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 12:59:33,791 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-23 12:59:33,792 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-23 12:59:33,924 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-23 12:59:33,924 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-23 12:59:33,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 12:59:33 BoogieIcfgContainer [2018-11-23 12:59:33,925 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-23 12:59:33,925 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-23 12:59:33,925 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-23 12:59:33,928 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-23 12:59:33,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 12:59:33" (1/3) ... [2018-11-23 12:59:33,929 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6190b06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 12:59:33, skipping insertion in model container [2018-11-23 12:59:33,929 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:59:33" (2/3) ... [2018-11-23 12:59:33,929 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6190b06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 12:59:33, skipping insertion in model container [2018-11-23 12:59:33,929 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 12:59:33" (3/3) ... [2018-11-23 12:59:33,930 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci01_true-unreach-call_true-no-overflow.c [2018-11-23 12:59:33,938 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-23 12:59:33,945 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-23 12:59:33,959 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-23 12:59:33,983 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-23 12:59:33,984 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-23 12:59:33,984 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-23 12:59:33,984 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-23 12:59:33,984 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-23 12:59:33,984 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-23 12:59:33,984 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-23 12:59:33,984 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-23 12:59:33,998 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-11-23 12:59:34,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-23 12:59:34,003 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:34,004 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 12:59:34,006 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:34,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:34,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2018-11-23 12:59:34,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:34,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:34,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,046 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:34,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:34,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 12:59:34,156 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 12:59:34,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-23 12:59:34,156 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 12:59:34,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-23 12:59:34,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-23 12:59:34,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-23 12:59:34,168 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2018-11-23 12:59:34,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:34,259 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2018-11-23 12:59:34,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-23 12:59:34,260 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2018-11-23 12:59:34,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:34,269 INFO L225 Difference]: With dead ends: 36 [2018-11-23 12:59:34,269 INFO L226 Difference]: Without dead ends: 22 [2018-11-23 12:59:34,272 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 [2018-11-23 12:59:34,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-23 12:59:34,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-23 12:59:34,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-23 12:59:34,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2018-11-23 12:59:34,300 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2018-11-23 12:59:34,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:34,300 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2018-11-23 12:59:34,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-23 12:59:34,301 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2018-11-23 12:59:34,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-23 12:59:34,302 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:34,302 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] [2018-11-23 12:59:34,302 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:34,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:34,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2018-11-23 12:59:34,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:34,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:34,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,304 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:34,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:34,380 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-23 12:59:34,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:34,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:34,381 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-11-23 12:59:34,383 INFO L202 CegarAbsIntRunner]: [0], [3], [4], [8], [10], [12], [13], [14], [18], [22], [24], [28], [30], [33], [34], [35], [36], [37], [38], [39], [41], [42] [2018-11-23 12:59:34,406 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 12:59:34,406 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 12:59:34,631 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 12:59:34,632 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. [2018-11-23 12:59:34,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:34,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 12:59:34,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:34,642 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:34,648 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:34,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 12:59:34,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:34,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:34,694 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 12:59:34,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:34,816 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-23 12:59:34,842 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-11-23 12:59:34,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 7 [2018-11-23 12:59:34,842 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 12:59:34,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-23 12:59:34,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-23 12:59:34,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-11-23 12:59:34,843 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2018-11-23 12:59:34,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:34,892 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2018-11-23 12:59:34,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-23 12:59:34,893 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2018-11-23 12:59:34,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:34,893 INFO L225 Difference]: With dead ends: 39 [2018-11-23 12:59:34,894 INFO L226 Difference]: Without dead ends: 24 [2018-11-23 12:59:34,894 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 [2018-11-23 12:59:34,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-23 12:59:34,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-23 12:59:34,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-23 12:59:34,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2018-11-23 12:59:34,899 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2018-11-23 12:59:34,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:34,900 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2018-11-23 12:59:34,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-23 12:59:34,900 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2018-11-23 12:59:34,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-11-23 12:59:34,901 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:34,901 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] [2018-11-23 12:59:34,901 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:34,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:34,902 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2018-11-23 12:59:34,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:34,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,902 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:34,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:34,903 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:34,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:34,990 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-23 12:59:34,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:34,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:34,991 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 29 with the following transitions: [2018-11-23 12:59:34,991 INFO L202 CegarAbsIntRunner]: [0], [3], [4], [7], [8], [10], [12], [13], [14], [18], [22], [24], [28], [30], [33], [34], [35], [36], [37], [38], [39], [41], [42] [2018-11-23 12:59:34,993 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 12:59:34,993 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 12:59:36,046 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 12:59:36,047 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. [2018-11-23 12:59:36,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:36,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 12:59:36,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:36,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:36,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:36,066 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 12:59:36,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:36,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:36,182 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-23 12:59:36,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:36,383 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 12:59:36,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 12:59:36,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 18 [2018-11-23 12:59:36,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 12:59:36,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-23 12:59:36,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-23 12:59:36,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2018-11-23 12:59:36,411 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 16 states. [2018-11-23 12:59:36,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:36,570 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2018-11-23 12:59:36,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-23 12:59:36,570 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 28 [2018-11-23 12:59:36,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:36,572 INFO L225 Difference]: With dead ends: 34 [2018-11-23 12:59:36,572 INFO L226 Difference]: Without dead ends: 30 [2018-11-23 12:59:36,572 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 [2018-11-23 12:59:36,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-23 12:59:36,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-11-23 12:59:36,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-23 12:59:36,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2018-11-23 12:59:36,577 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2018-11-23 12:59:36,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:36,578 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2018-11-23 12:59:36,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-23 12:59:36,578 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2018-11-23 12:59:36,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-23 12:59:36,579 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:36,579 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] [2018-11-23 12:59:36,579 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:36,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:36,579 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 2 times [2018-11-23 12:59:36,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:36,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:36,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:36,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:36,580 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:36,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:36,656 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-11-23 12:59:36,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:36,656 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:36,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 12:59:36,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 12:59:36,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:36,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:36,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 12:59:36,670 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 12:59:36,684 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-23 12:59:36,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 12:59:36,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-23 12:59:36,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:37,079 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-11-23 12:59:37,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 12:59:37,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 14] total 27 [2018-11-23 12:59:37,093 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 12:59:37,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-23 12:59:37,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-23 12:59:37,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2018-11-23 12:59:37,094 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 19 states. [2018-11-23 12:59:37,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:37,374 INFO L93 Difference]: Finished difference Result 57 states and 82 transitions. [2018-11-23 12:59:37,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-23 12:59:37,375 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2018-11-23 12:59:37,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:37,376 INFO L225 Difference]: With dead ends: 57 [2018-11-23 12:59:37,376 INFO L226 Difference]: Without dead ends: 35 [2018-11-23 12:59:37,377 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 [2018-11-23 12:59:37,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-11-23 12:59:37,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2018-11-23 12:59:37,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-23 12:59:37,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2018-11-23 12:59:37,381 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 41 [2018-11-23 12:59:37,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:37,381 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2018-11-23 12:59:37,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-23 12:59:37,382 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2018-11-23 12:59:37,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-23 12:59:37,382 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:37,382 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] [2018-11-23 12:59:37,382 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:37,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:37,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 3 times [2018-11-23 12:59:37,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:37,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:37,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 12:59:37,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:37,384 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:37,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:37,491 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 25 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-23 12:59:37,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:37,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:37,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 12:59:37,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 12:59:37,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:37,492 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:37,504 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 12:59:37,504 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 12:59:37,516 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 12:59:37,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 12:59:37,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:37,634 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-23 12:59:37,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:37,993 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-11-23 12:59:38,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 12:59:38,008 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16] total 27 [2018-11-23 12:59:38,008 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 12:59:38,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-23 12:59:38,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-23 12:59:38,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2018-11-23 12:59:38,009 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 22 states. [2018-11-23 12:59:38,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:38,339 INFO L93 Difference]: Finished difference Result 49 states and 74 transitions. [2018-11-23 12:59:38,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-23 12:59:38,339 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-11-23 12:59:38,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:38,341 INFO L225 Difference]: With dead ends: 49 [2018-11-23 12:59:38,341 INFO L226 Difference]: Without dead ends: 43 [2018-11-23 12:59:38,342 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 62 SyntacticMatches, 11 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=1422, Unknown=0, NotChecked=0, Total=1722 [2018-11-23 12:59:38,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-23 12:59:38,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2018-11-23 12:59:38,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-23 12:59:38,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 54 transitions. [2018-11-23 12:59:38,348 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 54 transitions. Word has length 42 [2018-11-23 12:59:38,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:38,349 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 54 transitions. [2018-11-23 12:59:38,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-23 12:59:38,349 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 54 transitions. [2018-11-23 12:59:38,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-23 12:59:38,351 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:38,351 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] [2018-11-23 12:59:38,351 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:38,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:38,352 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 4 times [2018-11-23 12:59:38,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:38,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:38,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 12:59:38,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:38,353 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:38,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:38,438 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 176 proven. 28 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2018-11-23 12:59:38,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:38,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:38,438 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 12:59:38,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 12:59:38,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:38,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:38,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:38,444 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 12:59:38,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:38,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:38,500 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 93 proven. 162 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2018-11-23 12:59:38,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:38,834 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 92 proven. 171 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2018-11-23 12:59:38,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 12:59:38,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 14] total 21 [2018-11-23 12:59:38,848 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 12:59:38,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-23 12:59:38,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-23 12:59:38,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2018-11-23 12:59:38,849 INFO L87 Difference]: Start difference. First operand 37 states and 54 transitions. Second operand 15 states. [2018-11-23 12:59:39,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:39,004 INFO L93 Difference]: Finished difference Result 79 states and 136 transitions. [2018-11-23 12:59:39,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-23 12:59:39,004 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 97 [2018-11-23 12:59:39,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:39,005 INFO L225 Difference]: With dead ends: 79 [2018-11-23 12:59:39,005 INFO L226 Difference]: Without dead ends: 49 [2018-11-23 12:59:39,006 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 [2018-11-23 12:59:39,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-23 12:59:39,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-11-23 12:59:39,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-23 12:59:39,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2018-11-23 12:59:39,011 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 97 [2018-11-23 12:59:39,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:39,011 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2018-11-23 12:59:39,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-23 12:59:39,011 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2018-11-23 12:59:39,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-23 12:59:39,012 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 12:59:39,012 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] [2018-11-23 12:59:39,013 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 12:59:39,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 12:59:39,014 INFO L82 PathProgramCache]: Analyzing trace with hash -865837754, now seen corresponding path program 5 times [2018-11-23 12:59:39,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 12:59:39,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:39,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 12:59:39,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 12:59:39,015 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 12:59:39,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 12:59:39,133 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 13 proven. 91 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-11-23 12:59:39,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:39,133 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 12:59:39,133 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 12:59:39,133 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 12:59:39,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 12:59:39,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/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 [2018-11-23 12:59:39,140 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 12:59:39,140 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 12:59:39,157 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-23 12:59:39,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 12:59:39,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 12:59:39,318 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 74 proven. 40 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2018-11-23 12:59:39,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 12:59:39,906 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 58 proven. 63 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2018-11-23 12:59:39,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 12:59:39,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 18, 20] total 32 [2018-11-23 12:59:39,923 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 12:59:39,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-23 12:59:39,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-23 12:59:39,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2018-11-23 12:59:39,924 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand 26 states. [2018-11-23 12:59:40,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 12:59:40,106 INFO L93 Difference]: Finished difference Result 51 states and 62 transitions. [2018-11-23 12:59:40,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-23 12:59:40,106 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2018-11-23 12:59:40,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 12:59:40,107 INFO L225 Difference]: With dead ends: 51 [2018-11-23 12:59:40,107 INFO L226 Difference]: Without dead ends: 0 [2018-11-23 12:59:40,107 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 [2018-11-23 12:59:40,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-23 12:59:40,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-23 12:59:40,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-23 12:59:40,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-23 12:59:40,108 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2018-11-23 12:59:40,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 12:59:40,108 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-23 12:59:40,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-23 12:59:40,108 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-23 12:59:40,108 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-23 12:59:40,111 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-23 12:59:40,234 INFO L448 ceAbstractionStarter]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2018-11-23 12:59:40,235 INFO L451 ceAbstractionStarter]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2018-11-23 12:59:40,235 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|)) [2018-11-23 12:59:40,235 INFO L448 ceAbstractionStarter]: For program point L20-1(line 20) no Hoare annotation was computed. [2018-11-23 12:59:40,235 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))) [2018-11-23 12:59:40,235 INFO L448 ceAbstractionStarter]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2018-11-23 12:59:40,235 INFO L448 ceAbstractionStarter]: For program point L17(lines 17 21) no Hoare annotation was computed. [2018-11-23 12:59:40,235 INFO L448 ceAbstractionStarter]: For program point L20-3(line 20) no Hoare annotation was computed. [2018-11-23 12:59:40,236 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 21) no Hoare annotation was computed. [2018-11-23 12:59:40,236 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-23 12:59:40,236 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-23 12:59:40,237 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point L31(lines 31 35) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L451 ceAbstractionStarter]: At program point L30(line 30) the Hoare annotation is: true [2018-11-23 12:59:40,237 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point L30-1(line 30) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point L27(lines 27 29) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2018-11-23 12:59:40,237 INFO L448 ceAbstractionStarter]: For program point L34(line 34) no Hoare annotation was computed. [2018-11-23 12:59:40,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 12:59:40 BoogieIcfgContainer [2018-11-23 12:59:40,239 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-23 12:59:40,239 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-23 12:59:40,240 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-23 12:59:40,240 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-23 12:59:40,240 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 12:59:33" (3/4) ... [2018-11-23 12:59:40,243 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-23 12:59:40,247 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibonacci [2018-11-23 12:59:40,247 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-23 12:59:40,247 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-23 12:59:40,250 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-23 12:59:40,250 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-23 12:59:40,250 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-23 12:59:40,278 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_7336966e-c6a3-4b49-81ba-6fcc497afca8/bin-2019/utaipan/witness.graphml [2018-11-23 12:59:40,278 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-23 12:59:40,279 INFO L168 Benchmark]: Toolchain (without parser) took 6739.78 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 323.5 MB). Free memory was 953.8 MB in the beginning and 967.8 MB in the end (delta: -14.0 MB). Peak memory consumption was 309.5 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,280 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 12:59:40,280 INFO L168 Benchmark]: CACSL2BoogieTranslator took 145.18 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,281 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.95 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 12:59:40,281 INFO L168 Benchmark]: Boogie Preprocessor took 10.54 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,281 INFO L168 Benchmark]: RCFGBuilder took 216.43 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 142.1 MB). Free memory was 940.3 MB in the beginning and 1.1 GB in the end (delta: -184.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,282 INFO L168 Benchmark]: TraceAbstraction took 6313.91 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 181.4 MB). Free memory was 1.1 GB in the beginning and 976.0 MB in the end (delta: 149.1 MB). Peak memory consumption was 330.5 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,282 INFO L168 Benchmark]: Witness Printer took 38.66 ms. Allocated memory is still 1.4 GB. Free memory was 976.0 MB in the beginning and 967.8 MB in the end (delta: 8.2 MB). Peak memory consumption was 8.2 MB. Max. memory is 11.5 GB. [2018-11-23 12:59:40,284 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 145.18 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.95 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.54 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 216.43 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 142.1 MB). Free memory was 940.3 MB in the beginning and 1.1 GB in the end (delta: -184.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6313.91 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 181.4 MB). Free memory was 1.1 GB in the beginning and 976.0 MB in the end (delta: 149.1 MB). Peak memory consumption was 330.5 MB. Max. memory is 11.5 GB. * Witness Printer took 38.66 ms. Allocated memory is still 1.4 GB. Free memory was 976.0 MB in the beginning and 967.8 MB in the end (delta: 8.2 MB). Peak memory consumption was 8.2 MB. 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, 6.2s OverallTime, 7 OverallIterations, 13 TraceHistogramMax, 1.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 128 SDtfs, 151 SDslu, 722 SDs, 0 SdLazy, 1203 SolverSat, 236 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 747 GetRequests, 502 SyntacticMatches, 62 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1703 ImplicationChecksByTransitivity, 1.9s 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, 1.3s 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, 0.1s SatisfiabilityAnalysisTime, 3.0s 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...