./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/sum_15x0_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_15x0_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 7f140b11074e684b22c263036fee9fde5b4c087a .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 15:35:19,876 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 15:35:19,877 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 15:35:19,886 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 15:35:19,886 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 15:35:19,886 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 15:35:19,887 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 15:35:19,889 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 15:35:19,890 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 15:35:19,891 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 15:35:19,891 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 15:35:19,892 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 15:35:19,892 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 15:35:19,893 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 15:35:19,894 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 15:35:19,894 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 15:35:19,895 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 15:35:19,897 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 15:35:19,898 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 15:35:19,899 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 15:35:19,900 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 15:35:19,901 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 15:35:19,903 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 15:35:19,903 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 15:35:19,904 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 15:35:19,904 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 15:35:19,905 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 15:35:19,906 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 15:35:19,906 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 15:35:19,907 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 15:35:19,907 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 15:35:19,908 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 15:35:19,908 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 15:35:19,908 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 15:35:19,909 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 15:35:19,910 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 15:35:19,910 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 15:35:19,922 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 15:35:19,922 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 15:35:19,923 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 15:35:19,923 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 15:35:19,923 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 15:35:19,923 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 15:35:19,924 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 15:35:19,925 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 15:35:19,925 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 15:35:19,925 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 15:35:19,926 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 15:35:19,926 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 15:35:19,926 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 15:35:19,926 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 15:35:19,926 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 15:35:19,927 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 15:35:19,927 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 15:35:19,927 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 15:35:19,927 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 15:35:19,927 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 15:35:19,928 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 15:35:19,928 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 15:35:19,928 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 15:35:19,928 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 15:35:19,928 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 15:35:19,928 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 15:35:19,928 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 15:35:19,929 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 15:35:19,929 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 15:35:19,929 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 15:35:19,929 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 15:35:19,929 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 15:35:19,929 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_0885d753-b479-4794-bb7a-882d324f4085/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 -> 7f140b11074e684b22c263036fee9fde5b4c087a [2018-11-18 15:35:19,955 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 15:35:19,965 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 15:35:19,967 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 15:35:19,968 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 15:35:19,968 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 15:35:19,969 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_15x0_true-unreach-call_true-termination.c [2018-11-18 15:35:20,012 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/data/e493582d4/bcf01b19f0264beaa83d36625f4c9ed7/FLAGf6263d691 [2018-11-18 15:35:20,351 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 15:35:20,351 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/sv-benchmarks/c/recursive-simple/sum_15x0_true-unreach-call_true-termination.c [2018-11-18 15:35:20,356 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/data/e493582d4/bcf01b19f0264beaa83d36625f4c9ed7/FLAGf6263d691 [2018-11-18 15:35:20,771 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/data/e493582d4/bcf01b19f0264beaa83d36625f4c9ed7 [2018-11-18 15:35:20,773 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 15:35:20,774 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 15:35:20,775 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 15:35:20,775 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 15:35:20,778 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 15:35:20,778 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bba66d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20, skipping insertion in model container [2018-11-18 15:35:20,780 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 15:35:20,800 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 15:35:20,895 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 15:35:20,897 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 15:35:20,906 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 15:35:20,915 INFO L195 MainTranslator]: Completed translation [2018-11-18 15:35:20,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20 WrapperNode [2018-11-18 15:35:20,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 15:35:20,915 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 15:35:20,915 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 15:35:20,916 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 15:35:20,921 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,924 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,927 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 15:35:20,928 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 15:35:20,928 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 15:35:20,928 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 15:35:20,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,934 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,935 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,936 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,938 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,938 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... [2018-11-18 15:35:20,939 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 15:35:20,940 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 15:35:20,940 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 15:35:20,940 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 15:35:20,940 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:21,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 15:35:21,015 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 15:35:21,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 15:35:21,015 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 15:35:21,015 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-18 15:35:21,015 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-18 15:35:21,016 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 15:35:21,016 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 15:35:21,117 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 15:35:21,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:35:21 BoogieIcfgContainer [2018-11-18 15:35:21,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 15:35:21,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 15:35:21,118 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 15:35:21,120 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 15:35:21,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 03:35:20" (1/3) ... [2018-11-18 15:35:21,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac2beeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 03:35:21, skipping insertion in model container [2018-11-18 15:35:21,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:35:20" (2/3) ... [2018-11-18 15:35:21,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac2beeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 03:35:21, skipping insertion in model container [2018-11-18 15:35:21,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:35:21" (3/3) ... [2018-11-18 15:35:21,123 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_15x0_true-unreach-call_true-termination.c [2018-11-18 15:35:21,129 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 15:35:21,134 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 15:35:21,145 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 15:35:21,165 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 15:35:21,165 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 15:35:21,165 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 15:35:21,165 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 15:35:21,165 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 15:35:21,165 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 15:35:21,165 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 15:35:21,166 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 15:35:21,177 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-18 15:35:21,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 15:35:21,181 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:21,182 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:21,183 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:21,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:21,187 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-11-18 15:35:21,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:21,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:21,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,218 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:21,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:21,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:35:21,304 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 15:35:21,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 15:35:21,304 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 15:35:21,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 15:35:21,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 15:35:21,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 15:35:21,322 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-18 15:35:21,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:21,395 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-18 15:35:21,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 15:35:21,397 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-18 15:35:21,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:21,405 INFO L225 Difference]: With dead ends: 30 [2018-11-18 15:35:21,405 INFO L226 Difference]: Without dead ends: 18 [2018-11-18 15:35:21,409 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-18 15:35:21,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-18 15:35:21,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-18 15:35:21,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-18 15:35:21,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-18 15:35:21,441 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-18 15:35:21,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:21,441 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-18 15:35:21,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 15:35:21,442 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-18 15:35:21,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 15:35:21,443 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:21,443 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:21,444 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:21,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:21,444 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-11-18 15:35:21,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:21,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:21,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,445 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:21,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:21,503 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 15:35:21,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:21,503 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:21,504 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-18 15:35:21,505 INFO L202 CegarAbsIntRunner]: [0], [4], [7], [8], [10], [11], [12], [14], [17], [19], [25], [26], [27], [29], [30], [31], [32] [2018-11-18 15:35:21,529 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 15:35:21,529 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 15:35:21,630 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 15:35:21,631 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 130 root evaluator evaluations with a maximum evaluation depth of 4. Performed 130 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 2 fixpoints after 2 different actions. Largest state had 6 variables. [2018-11-18 15:35:21,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:21,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 15:35:21,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:21,648 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:21,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:21,655 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 15:35:21,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:21,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:21,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 15:35:21,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:21,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 15:35:21,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:21,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-11-18 15:35:21,911 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:21,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 15:35:21,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 15:35:21,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-11-18 15:35:21,913 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-18 15:35:21,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:21,968 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-18 15:35:21,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 15:35:21,969 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-18 15:35:21,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:21,970 INFO L225 Difference]: With dead ends: 25 [2018-11-18 15:35:21,970 INFO L226 Difference]: Without dead ends: 21 [2018-11-18 15:35:21,970 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-11-18 15:35:21,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-18 15:35:21,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-18 15:35:21,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-18 15:35:21,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-18 15:35:21,974 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-18 15:35:21,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:21,975 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-18 15:35:21,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 15:35:21,975 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-18 15:35:21,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-18 15:35:21,976 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:21,976 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:21,976 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:21,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:21,977 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-11-18 15:35:21,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:21,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:21,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:21,978 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:21,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:22,037 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 15:35:22,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:22,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:22,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:22,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:22,043 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:35:22,043 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 15:35:22,054 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 15:35:22,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:22,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:22,062 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 15:35:22,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:22,288 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-18 15:35:22,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:22,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-11-18 15:35:22,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:22,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 15:35:22,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 15:35:22,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-11-18 15:35:22,315 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-18 15:35:22,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:22,393 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-18 15:35:22,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 15:35:22,393 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-18 15:35:22,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:22,394 INFO L225 Difference]: With dead ends: 28 [2018-11-18 15:35:22,394 INFO L226 Difference]: Without dead ends: 24 [2018-11-18 15:35:22,395 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-11-18 15:35:22,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-18 15:35:22,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-18 15:35:22,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 15:35:22,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-18 15:35:22,399 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-18 15:35:22,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:22,399 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-18 15:35:22,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 15:35:22,400 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-18 15:35:22,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-18 15:35:22,400 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:22,401 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:22,401 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:22,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:22,401 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-11-18 15:35:22,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:22,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:22,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:22,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:22,402 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:22,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:22,470 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 15:35:22,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,471 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:22,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:22,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:22,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:22,481 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:35:22,481 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 15:35:22,489 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:35:22,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:22,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:22,502 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 15:35:22,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:22,785 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 15:35:22,800 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:22,800 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-11-18 15:35:22,800 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:22,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 15:35:22,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 15:35:22,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-11-18 15:35:22,801 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-18 15:35:22,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:22,848 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-18 15:35:22,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 15:35:22,848 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-18 15:35:22,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:22,849 INFO L225 Difference]: With dead ends: 31 [2018-11-18 15:35:22,849 INFO L226 Difference]: Without dead ends: 27 [2018-11-18 15:35:22,849 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-18 15:35:22,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-18 15:35:22,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-18 15:35:22,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-18 15:35:22,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-18 15:35:22,853 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-18 15:35:22,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:22,854 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-18 15:35:22,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 15:35:22,854 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-18 15:35:22,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-18 15:35:22,854 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:22,855 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:22,855 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:22,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:22,855 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-11-18 15:35:22,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:22,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:22,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:22,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:22,856 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:22,926 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 15:35:22,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:22,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:22,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:22,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:22,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:22,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:22,935 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 15:35:22,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:22,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 15:35:22,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:23,334 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-18 15:35:23,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:23,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-11-18 15:35:23,350 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:23,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 15:35:23,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 15:35:23,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-11-18 15:35:23,351 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-18 15:35:23,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:23,396 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-18 15:35:23,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 15:35:23,396 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-18 15:35:23,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:23,396 INFO L225 Difference]: With dead ends: 34 [2018-11-18 15:35:23,396 INFO L226 Difference]: Without dead ends: 30 [2018-11-18 15:35:23,397 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-11-18 15:35:23,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-18 15:35:23,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-18 15:35:23,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 15:35:23,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-18 15:35:23,399 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-18 15:35:23,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:23,401 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-18 15:35:23,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 15:35:23,401 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-18 15:35:23,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-18 15:35:23,402 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:23,402 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:23,402 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:23,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:23,402 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-11-18 15:35:23,402 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:23,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:23,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:23,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:23,403 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:23,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:23,459 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 15:35:23,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:23,459 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:23,459 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:23,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:23,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:23,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:23,465 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:35:23,466 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 15:35:23,477 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-18 15:35:23,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:23,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:23,488 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 15:35:23,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:24,105 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 15:35:24,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:24,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-11-18 15:35:24,121 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:24,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 15:35:24,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 15:35:24,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-11-18 15:35:24,122 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-18 15:35:24,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:24,186 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-18 15:35:24,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 15:35:24,187 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-18 15:35:24,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:24,188 INFO L225 Difference]: With dead ends: 37 [2018-11-18 15:35:24,188 INFO L226 Difference]: Without dead ends: 33 [2018-11-18 15:35:24,188 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-11-18 15:35:24,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-18 15:35:24,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-18 15:35:24,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 15:35:24,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-18 15:35:24,192 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-18 15:35:24,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:24,192 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-18 15:35:24,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 15:35:24,193 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-18 15:35:24,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-18 15:35:24,193 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:24,194 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:24,194 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:24,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:24,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-11-18 15:35:24,194 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:24,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:24,195 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:24,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:24,195 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:24,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:24,262 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 15:35:24,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:24,263 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:24,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:24,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:24,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:24,263 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/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 [2018-11-18 15:35:24,272 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:35:24,272 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 15:35:24,286 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:35:24,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:24,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:24,301 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 15:35:24,301 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:25,111 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-18 15:35:25,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:25,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-11-18 15:35:25,140 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:25,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 15:35:25,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 15:35:25,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-11-18 15:35:25,142 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-18 15:35:25,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:25,228 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-18 15:35:25,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 15:35:25,229 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-18 15:35:25,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:25,230 INFO L225 Difference]: With dead ends: 40 [2018-11-18 15:35:25,230 INFO L226 Difference]: Without dead ends: 36 [2018-11-18 15:35:25,231 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-11-18 15:35:25,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-18 15:35:25,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-18 15:35:25,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-18 15:35:25,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-18 15:35:25,234 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-18 15:35:25,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:25,234 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-18 15:35:25,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 15:35:25,234 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-18 15:35:25,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-18 15:35:25,235 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:25,235 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:25,235 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:25,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:25,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-11-18 15:35:25,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:25,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:25,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:25,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:25,236 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:25,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:25,335 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 15:35:25,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:25,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:25,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:25,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:25,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:25,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:25,345 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:25,345 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 15:35:25,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:25,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:25,378 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 15:35:25,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:26,490 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-18 15:35:26,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:26,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-11-18 15:35:26,508 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:26,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 15:35:26,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 15:35:26,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-11-18 15:35:26,509 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-18 15:35:26,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:26,595 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-18 15:35:26,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 15:35:26,596 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-18 15:35:26,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:26,596 INFO L225 Difference]: With dead ends: 43 [2018-11-18 15:35:26,597 INFO L226 Difference]: Without dead ends: 39 [2018-11-18 15:35:26,597 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-11-18 15:35:26,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-18 15:35:26,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-18 15:35:26,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-18 15:35:26,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-18 15:35:26,601 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-18 15:35:26,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:26,602 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-18 15:35:26,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 15:35:26,602 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-18 15:35:26,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-18 15:35:26,602 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:26,603 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:26,603 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:26,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:26,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-11-18 15:35:26,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:26,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:26,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:26,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:26,604 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:26,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:26,682 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 15:35:26,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:26,682 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:26,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:26,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:26,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:26,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:26,694 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:35:26,694 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 15:35:26,710 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-18 15:35:26,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:26,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:26,732 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 15:35:26,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:28,197 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-18 15:35:28,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:28,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-11-18 15:35:28,212 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:28,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 15:35:28,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 15:35:28,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-11-18 15:35:28,213 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-18 15:35:28,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:28,292 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-18 15:35:28,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 15:35:28,292 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-18 15:35:28,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:28,293 INFO L225 Difference]: With dead ends: 46 [2018-11-18 15:35:28,293 INFO L226 Difference]: Without dead ends: 42 [2018-11-18 15:35:28,293 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-11-18 15:35:28,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-18 15:35:28,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-18 15:35:28,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-18 15:35:28,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-18 15:35:28,296 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-18 15:35:28,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:28,296 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-18 15:35:28,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 15:35:28,296 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-18 15:35:28,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-18 15:35:28,297 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:28,297 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:28,297 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:28,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:28,297 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-11-18 15:35:28,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:28,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:28,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:28,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:28,298 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:28,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:28,378 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 15:35:28,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:28,378 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:28,378 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:28,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:28,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:28,378 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:28,384 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:35:28,385 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 15:35:28,398 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:35:28,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:28,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:28,408 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 15:35:28,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-18 15:35:30,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:30,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-11-18 15:35:30,441 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:30,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-18 15:35:30,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-18 15:35:30,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-11-18 15:35:30,442 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-18 15:35:30,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:30,517 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-18 15:35:30,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-18 15:35:30,517 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-18 15:35:30,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:30,518 INFO L225 Difference]: With dead ends: 49 [2018-11-18 15:35:30,518 INFO L226 Difference]: Without dead ends: 45 [2018-11-18 15:35:30,518 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-11-18 15:35:30,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-18 15:35:30,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-18 15:35:30,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-18 15:35:30,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-18 15:35:30,522 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-18 15:35:30,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:30,522 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-18 15:35:30,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-18 15:35:30,522 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-18 15:35:30,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-18 15:35:30,523 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:30,523 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:30,524 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:30,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:30,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-11-18 15:35:30,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:30,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:30,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:30,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:30,525 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:30,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:30,634 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-18 15:35:30,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:30,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:30,634 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:30,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:30,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:30,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:30,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:30,643 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 15:35:30,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:30,659 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:30,674 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-18 15:35:30,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:33,129 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-18 15:35:33,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:33,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-11-18 15:35:33,149 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:33,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 15:35:33,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 15:35:33,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-11-18 15:35:33,150 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-18 15:35:33,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:33,242 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-18 15:35:33,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 15:35:33,242 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-18 15:35:33,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:33,243 INFO L225 Difference]: With dead ends: 52 [2018-11-18 15:35:33,243 INFO L226 Difference]: Without dead ends: 48 [2018-11-18 15:35:33,243 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-11-18 15:35:33,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-18 15:35:33,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-18 15:35:33,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-18 15:35:33,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-18 15:35:33,247 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-18 15:35:33,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:33,247 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-18 15:35:33,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 15:35:33,247 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-18 15:35:33,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-18 15:35:33,247 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:33,247 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:33,248 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:33,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:33,248 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-11-18 15:35:33,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:33,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:33,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:33,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:33,249 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:33,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:33,353 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-18 15:35:33,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:33,353 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:33,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:33,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:33,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:33,354 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:33,371 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:35:33,372 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 15:35:33,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-18 15:35:33,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:33,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:33,427 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-18 15:35:33,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:36,650 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-18 15:35:36,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:36,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-11-18 15:35:36,674 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:36,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 15:35:36,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 15:35:36,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-11-18 15:35:36,675 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-18 15:35:36,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:36,801 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-18 15:35:36,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 15:35:36,801 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-18 15:35:36,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:36,802 INFO L225 Difference]: With dead ends: 55 [2018-11-18 15:35:36,802 INFO L226 Difference]: Without dead ends: 51 [2018-11-18 15:35:36,803 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-11-18 15:35:36,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-18 15:35:36,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-18 15:35:36,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-18 15:35:36,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-18 15:35:36,807 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-18 15:35:36,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:36,807 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-18 15:35:36,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 15:35:36,807 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-18 15:35:36,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-18 15:35:36,808 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:36,808 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:36,808 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:36,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:36,809 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-11-18 15:35:36,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:36,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:36,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:36,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:36,810 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:36,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:36,893 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-18 15:35:36,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:36,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:36,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:36,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:36,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:36,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:36,903 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:35:36,903 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 15:35:36,922 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:35:36,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:36,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:36,943 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-18 15:35:36,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:41,347 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-18 15:35:41,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:41,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-11-18 15:35:41,363 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:41,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 15:35:41,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 15:35:41,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-11-18 15:35:41,364 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-18 15:35:41,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:41,494 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-18 15:35:41,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 15:35:41,494 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-18 15:35:41,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:41,495 INFO L225 Difference]: With dead ends: 58 [2018-11-18 15:35:41,495 INFO L226 Difference]: Without dead ends: 54 [2018-11-18 15:35:41,496 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-11-18 15:35:41,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-18 15:35:41,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-18 15:35:41,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-18 15:35:41,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-18 15:35:41,500 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-18 15:35:41,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:41,500 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-18 15:35:41,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 15:35:41,500 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-18 15:35:41,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-18 15:35:41,501 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:41,501 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:41,501 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:41,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:41,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-11-18 15:35:41,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:41,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:41,502 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:41,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:41,503 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:41,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:41,619 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-18 15:35:41,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:41,619 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:41,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:41,620 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:41,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:41,620 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:41,626 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:41,626 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 15:35:41,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:41,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:41,658 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-18 15:35:41,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:46,722 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-18 15:35:46,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:46,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-11-18 15:35:46,738 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:46,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 15:35:46,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 15:35:46,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-11-18 15:35:46,738 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-18 15:35:46,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:46,859 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-18 15:35:46,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 15:35:46,859 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-18 15:35:46,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:46,860 INFO L225 Difference]: With dead ends: 61 [2018-11-18 15:35:46,860 INFO L226 Difference]: Without dead ends: 57 [2018-11-18 15:35:46,861 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-11-18 15:35:46,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-18 15:35:46,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-18 15:35:46,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-18 15:35:46,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-18 15:35:46,864 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-18 15:35:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:46,865 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-18 15:35:46,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 15:35:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-18 15:35:46,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-18 15:35:46,866 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:46,866 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:46,866 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:46,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:46,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-11-18 15:35:46,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:46,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:46,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:35:46,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:46,867 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:46,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:46,994 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-18 15:35:46,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:46,994 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:46,994 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:46,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:46,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:46,994 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:47,012 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:35:47,012 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 15:35:47,062 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-18 15:35:47,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:47,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:47,075 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-18 15:35:47,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-18 15:35:53,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 15:35:53,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 34 [2018-11-18 15:35:53,408 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 15:35:53,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 15:35:53,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 15:35:53,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 15:35:53,409 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-18 15:35:53,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:53,592 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-18 15:35:53,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 15:35:53,593 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-18 15:35:53,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:53,594 INFO L225 Difference]: With dead ends: 64 [2018-11-18 15:35:53,594 INFO L226 Difference]: Without dead ends: 60 [2018-11-18 15:35:53,595 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2018-11-18 15:35:53,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-18 15:35:53,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-18 15:35:53,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-18 15:35:53,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-18 15:35:53,602 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-18 15:35:53,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:53,603 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-18 15:35:53,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 15:35:53,603 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-18 15:35:53,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-18 15:35:53,603 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:35:53,603 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:35:53,604 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:35:53,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:35:53,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-11-18 15:35:53,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 15:35:53,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:53,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:35:53,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:35:53,605 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 15:35:53,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:35:54,267 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 374 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2018-11-18 15:35:54,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:54,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 15:35:54,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 15:35:54,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 15:35:54,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:35:54,267 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 15:35:54,273 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:35:54,273 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 15:35:54,292 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:35:54,292 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:35:54,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:35:54,460 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 690 trivial. 0 not checked. [2018-11-18 15:35:54,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 15:35:57,385 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 690 trivial. 0 not checked. [2018-11-18 15:35:57,410 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-18 15:35:57,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [39] total 43 [2018-11-18 15:35:57,410 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 15:35:57,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 15:35:57,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 15:35:57,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1720, Unknown=0, NotChecked=0, Total=1806 [2018-11-18 15:35:57,411 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 7 states. [2018-11-18 15:35:57,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:35:57,467 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-11-18 15:35:57,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 15:35:57,468 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 103 [2018-11-18 15:35:57,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:35:57,469 INFO L225 Difference]: With dead ends: 60 [2018-11-18 15:35:57,469 INFO L226 Difference]: Without dead ends: 0 [2018-11-18 15:35:57,470 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 212 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1880, Unknown=0, NotChecked=0, Total=1980 [2018-11-18 15:35:57,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-18 15:35:57,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-18 15:35:57,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-18 15:35:57,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-18 15:35:57,470 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 103 [2018-11-18 15:35:57,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:35:57,471 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-18 15:35:57,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 15:35:57,471 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-18 15:35:57,471 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-18 15:35:57,476 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-18 15:35:57,490 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-18 15:35:57,490 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L421 ceAbstractionStarter]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (= sum_~n |sum_#in~n|)) [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point L7-1(line 7) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 8) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L425 ceAbstractionStarter]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2018-11-18 15:35:57,490 INFO L428 ceAbstractionStarter]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2018-11-18 15:35:57,490 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point L16(line 16) no Hoare annotation was computed. [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point L15(lines 15 17) no Hoare annotation was computed. [2018-11-18 15:35:57,491 INFO L421 ceAbstractionStarter]: At program point L14(line 14) the Hoare annotation is: (<= 15 main_~a~0) [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point L14-1(line 14) no Hoare annotation was computed. [2018-11-18 15:35:57,491 INFO L425 ceAbstractionStarter]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2018-11-18 15:35:57,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 03:35:57 BoogieIcfgContainer [2018-11-18 15:35:57,493 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 15:35:57,493 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 15:35:57,493 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 15:35:57,493 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 15:35:57,494 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:35:21" (3/4) ... [2018-11-18 15:35:57,496 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-18 15:35:57,500 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-18 15:35:57,500 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2018-11-18 15:35:57,500 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-18 15:35:57,503 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-18 15:35:57,503 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-11-18 15:35:57,503 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-18 15:35:57,524 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_0885d753-b479-4794-bb7a-882d324f4085/bin-2019/utaipan/witness.graphml [2018-11-18 15:35:57,524 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 15:35:57,525 INFO L168 Benchmark]: Toolchain (without parser) took 36751.36 ms. Allocated memory was 1.0 GB in the beginning and 1.8 GB in the end (delta: 724.6 MB). Free memory was 958.1 MB in the beginning and 1.2 GB in the end (delta: -228.4 MB). Peak memory consumption was 496.2 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,525 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 15:35:57,526 INFO L168 Benchmark]: CACSL2BoogieTranslator took 140.64 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 MB in the beginning and 947.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,526 INFO L168 Benchmark]: Boogie Procedure Inliner took 12.17 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 15:35:57,526 INFO L168 Benchmark]: Boogie Preprocessor took 11.57 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,526 INFO L168 Benchmark]: RCFGBuilder took 177.94 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 106.4 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -147.0 MB). Peak memory consumption was 19.6 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,527 INFO L168 Benchmark]: TraceAbstraction took 36374.94 ms. Allocated memory was 1.1 GB in the beginning and 1.8 GB in the end (delta: 618.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -112.6 MB). Peak memory consumption was 505.5 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,527 INFO L168 Benchmark]: Witness Printer took 30.77 ms. Allocated memory is still 1.8 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 17.8 MB). Peak memory consumption was 17.8 MB. Max. memory is 11.5 GB. [2018-11-18 15:35:57,529 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 140.64 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 MB in the beginning and 947.3 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 12.17 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 11.57 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 177.94 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 106.4 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -147.0 MB). Peak memory consumption was 19.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 36374.94 ms. Allocated memory was 1.1 GB in the beginning and 1.8 GB in the end (delta: 618.1 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -112.6 MB). Peak memory consumption was 505.5 MB. Max. memory is 11.5 GB. * Witness Printer took 30.77 ms. Allocated memory is still 1.8 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 17.8 MB). Peak memory consumption was 17.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: 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, 20 locations, 1 error locations. SAFE Result, 36.3s OverallTime, 16 OverallIterations, 16 TraceHistogramMax, 1.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 192 SDtfs, 320 SDslu, 1203 SDs, 0 SdLazy, 957 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2275 GetRequests, 1586 SyntacticMatches, 244 SemanticMatches, 445 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3563 ImplicationChecksByTransitivity, 4.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 16 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 15 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 33.6s InterpolantComputationTime, 1843 NumberOfCodeBlocks, 1843 NumberOfCodeBlocksAsserted, 76 NumberOfCheckSat, 2712 ConstructedInterpolants, 0 QuantifiedInterpolants, 644778 SizeOfPredicates, 170 NumberOfNonLiveVariables, 2700 ConjunctsInSsa, 461 ConjunctsInUnsatCore, 46 InterpolantComputations, 3 PerfectInterpolantSequences, 5406/11520 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...