./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-08 18:32:04,934 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-08 18:32:04,935 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-08 18:32:04,941 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-08 18:32:04,942 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-08 18:32:04,942 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-08 18:32:04,943 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-08 18:32:04,944 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-08 18:32:04,945 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-08 18:32:04,945 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-08 18:32:04,946 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-08 18:32:04,946 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-08 18:32:04,946 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-08 18:32:04,947 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-08 18:32:04,947 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-08 18:32:04,948 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-08 18:32:04,948 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-08 18:32:04,949 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-08 18:32:04,951 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-08 18:32:04,952 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-08 18:32:04,952 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-08 18:32:04,953 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-08 18:32:04,954 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-08 18:32:04,954 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-08 18:32:04,954 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-08 18:32:04,955 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-08 18:32:04,956 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-08 18:32:04,956 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-08 18:32:04,956 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-08 18:32:04,957 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-08 18:32:04,957 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-08 18:32:04,957 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-08 18:32:04,958 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-08 18:32:04,958 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-08 18:32:04,958 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-08 18:32:04,959 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-08 18:32:04,959 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-08 18:32:04,967 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-08 18:32:04,967 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-08 18:32:04,967 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-08 18:32:04,967 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-08 18:32:04,968 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-08 18:32:04,968 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-08 18:32:04,969 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-08 18:32:04,969 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-08 18:32:04,970 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-08 18:32:04,970 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-08 18:32:04,970 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-08 18:32:04,971 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-08 18:32:04,971 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_fa9134e3-919f-435e-80e1-08ab22537102/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 -> 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 [2018-12-08 18:32:04,989 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-08 18:32:04,999 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-08 18:32:05,001 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-08 18:32:05,003 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-08 18:32:05,003 INFO L276 PluginConnector]: CDTParser initialized [2018-12-08 18:32:05,004 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-12-08 18:32:05,047 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/data/646b9565d/dfdfc460123e45fda72c2318c9e6b7a9/FLAG7b6bd961b [2018-12-08 18:32:05,331 INFO L307 CDTParser]: Found 1 translation units. [2018-12-08 18:32:05,331 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-12-08 18:32:05,334 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/data/646b9565d/dfdfc460123e45fda72c2318c9e6b7a9/FLAG7b6bd961b [2018-12-08 18:32:05,343 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/data/646b9565d/dfdfc460123e45fda72c2318c9e6b7a9 [2018-12-08 18:32:05,345 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-08 18:32:05,346 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-08 18:32:05,347 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-08 18:32:05,347 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-08 18:32:05,350 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-08 18:32:05,350 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,351 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@96971f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05, skipping insertion in model container [2018-12-08 18:32:05,352 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,356 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-08 18:32:05,364 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-08 18:32:05,458 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 18:32:05,460 INFO L191 MainTranslator]: Completed pre-run [2018-12-08 18:32:05,470 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 18:32:05,477 INFO L195 MainTranslator]: Completed translation [2018-12-08 18:32:05,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05 WrapperNode [2018-12-08 18:32:05,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-08 18:32:05,478 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-08 18:32:05,478 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-08 18:32:05,478 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-08 18:32:05,483 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,486 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,489 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-08 18:32:05,490 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-08 18:32:05,490 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-08 18:32:05,490 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-08 18:32:05,496 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,498 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,499 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,500 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... [2018-12-08 18:32:05,500 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-08 18:32:05,501 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-08 18:32:05,501 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-08 18:32:05,501 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-08 18:32:05,501 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-08 18:32:05,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-08 18:32:05,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-08 18:32:05,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-08 18:32:05,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-08 18:32:05,569 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-12-08 18:32:05,569 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-12-08 18:32:05,569 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-08 18:32:05,569 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-08 18:32:05,649 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-08 18:32:05,649 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-08 18:32:05,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 06:32:05 BoogieIcfgContainer [2018-12-08 18:32:05,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-08 18:32:05,650 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-08 18:32:05,650 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-08 18:32:05,652 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-08 18:32:05,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 08.12 06:32:05" (1/3) ... [2018-12-08 18:32:05,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22d23c88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 06:32:05, skipping insertion in model container [2018-12-08 18:32:05,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 06:32:05" (2/3) ... [2018-12-08 18:32:05,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22d23c88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 06:32:05, skipping insertion in model container [2018-12-08 18:32:05,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 06:32:05" (3/3) ... [2018-12-08 18:32:05,654 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_25x0_true-unreach-call_true-termination.c [2018-12-08 18:32:05,660 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-08 18:32:05,664 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-08 18:32:05,674 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-08 18:32:05,692 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-08 18:32:05,692 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-08 18:32:05,692 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-08 18:32:05,692 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-08 18:32:05,693 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-08 18:32:05,693 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-08 18:32:05,693 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-08 18:32:05,693 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-08 18:32:05,703 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-08 18:32:05,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-08 18:32:05,707 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:05,707 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:05,708 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:05,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:05,712 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-12-08 18:32:05,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:05,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:05,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:05,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:05,742 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:05,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:05,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 18:32:05,807 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 18:32:05,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-08 18:32:05,808 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-08 18:32:05,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-08 18:32:05,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-08 18:32:05,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-08 18:32:05,820 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-08 18:32:05,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:05,859 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-08 18:32:05,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-08 18:32:05,861 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-08 18:32:05,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:05,866 INFO L225 Difference]: With dead ends: 30 [2018-12-08 18:32:05,866 INFO L226 Difference]: Without dead ends: 18 [2018-12-08 18:32:05,868 INFO L631 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 [2018-12-08 18:32:05,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-08 18:32:05,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-08 18:32:05,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-08 18:32:05,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-08 18:32:05,892 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-08 18:32:05,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:05,892 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-08 18:32:05,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-08 18:32:05,893 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-08 18:32:05,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-08 18:32:05,894 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:05,894 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:05,894 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:05,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:05,894 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-12-08 18:32:05,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:05,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:05,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:05,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:05,895 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:05,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-08 18:32:05,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:05,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:05,941 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-08 18:32:05,942 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [8], [10], [11], [12], [14], [17], [19], [25], [26], [27], [29], [30], [31], [32] [2018-12-08 18:32:05,961 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-08 18:32:05,961 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-08 18:32:06,056 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-08 18:32:06,057 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. [2018-12-08 18:32:06,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:06,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-08 18:32:06,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:06,063 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:06,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:06,076 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:06,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:06,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:06,111 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-08 18:32:06,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:06,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-08 18:32:06,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:06,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-12-08 18:32:06,242 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:06,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-08 18:32:06,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-08 18:32:06,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-12-08 18:32:06,243 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-12-08 18:32:06,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:06,274 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-08 18:32:06,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-08 18:32:06,274 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-12-08 18:32:06,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:06,275 INFO L225 Difference]: With dead ends: 25 [2018-12-08 18:32:06,275 INFO L226 Difference]: Without dead ends: 21 [2018-12-08 18:32:06,276 INFO L631 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 [2018-12-08 18:32:06,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-08 18:32:06,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-08 18:32:06,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-08 18:32:06,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-08 18:32:06,279 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-12-08 18:32:06,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:06,279 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-08 18:32:06,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-08 18:32:06,279 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-08 18:32:06,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-08 18:32:06,279 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:06,280 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:06,280 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:06,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:06,280 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-12-08 18:32:06,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:06,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:06,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:06,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:06,335 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-08 18:32:06,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:06,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:06,335 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:06,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:06,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:06,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:06,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:06,341 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:06,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-08 18:32:06,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:06,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:06,356 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-08 18:32:06,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:06,515 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-08 18:32:06,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:06,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-08 18:32:06,530 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:06,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-08 18:32:06,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-08 18:32:06,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-08 18:32:06,530 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-12-08 18:32:06,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:06,580 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-12-08 18:32:06,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-08 18:32:06,581 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-08 18:32:06,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:06,581 INFO L225 Difference]: With dead ends: 28 [2018-12-08 18:32:06,581 INFO L226 Difference]: Without dead ends: 24 [2018-12-08 18:32:06,582 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-08 18:32:06,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-08 18:32:06,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-08 18:32:06,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-08 18:32:06,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-08 18:32:06,585 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-12-08 18:32:06,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:06,585 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-08 18:32:06,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-08 18:32:06,585 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-08 18:32:06,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-08 18:32:06,585 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:06,586 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:06,586 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:06,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:06,586 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-12-08 18:32:06,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:06,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:06,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:06,631 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-08 18:32:06,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:06,631 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:06,631 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:06,631 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:06,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:06,631 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:06,640 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:32:06,640 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:32:06,650 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:32:06,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:06,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:06,658 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-08 18:32:06,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:06,916 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-08 18:32:06,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:06,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-12-08 18:32:06,930 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:06,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 18:32:06,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 18:32:06,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-08 18:32:06,931 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-12-08 18:32:06,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:06,967 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-08 18:32:06,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-08 18:32:06,967 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-12-08 18:32:06,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:06,968 INFO L225 Difference]: With dead ends: 31 [2018-12-08 18:32:06,968 INFO L226 Difference]: Without dead ends: 27 [2018-12-08 18:32:06,968 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-08 18:32:06,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-08 18:32:06,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-08 18:32:06,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-08 18:32:06,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-08 18:32:06,971 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-12-08 18:32:06,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:06,971 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-08 18:32:06,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 18:32:06,972 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-08 18:32:06,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-08 18:32:06,972 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:06,972 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:06,972 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:06,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:06,972 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-12-08 18:32:06,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:06,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:06,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:06,973 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:06,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:07,035 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-08 18:32:07,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:07,035 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:07,035 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:07,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:07,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:07,036 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:07,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:07,044 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:07,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:07,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:07,063 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-08 18:32:07,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:07,458 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-08 18:32:07,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:07,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-08 18:32:07,472 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:07,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-08 18:32:07,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-08 18:32:07,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-08 18:32:07,472 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-12-08 18:32:07,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:07,522 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-12-08 18:32:07,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-08 18:32:07,522 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-08 18:32:07,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:07,523 INFO L225 Difference]: With dead ends: 34 [2018-12-08 18:32:07,523 INFO L226 Difference]: Without dead ends: 30 [2018-12-08 18:32:07,523 INFO L631 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 [2018-12-08 18:32:07,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-08 18:32:07,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-08 18:32:07,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-08 18:32:07,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-08 18:32:07,526 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-12-08 18:32:07,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:07,526 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-08 18:32:07,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-08 18:32:07,526 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-08 18:32:07,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-08 18:32:07,527 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:07,527 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:07,527 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:07,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:07,527 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-12-08 18:32:07,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:07,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:07,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:07,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:07,528 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:07,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:07,580 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-08 18:32:07,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:07,580 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:07,580 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:07,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:07,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:07,581 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:07,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:07,587 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:07,597 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-08 18:32:07,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:07,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:07,608 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-08 18:32:07,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:08,240 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-08 18:32:08,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:08,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-12-08 18:32:08,254 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:08,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-08 18:32:08,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-08 18:32:08,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-12-08 18:32:08,255 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-12-08 18:32:08,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:08,316 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-08 18:32:08,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-08 18:32:08,317 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-12-08 18:32:08,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:08,317 INFO L225 Difference]: With dead ends: 37 [2018-12-08 18:32:08,317 INFO L226 Difference]: Without dead ends: 33 [2018-12-08 18:32:08,318 INFO L631 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 [2018-12-08 18:32:08,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-08 18:32:08,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-08 18:32:08,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-08 18:32:08,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-08 18:32:08,321 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-12-08 18:32:08,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:08,321 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-08 18:32:08,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-08 18:32:08,321 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-08 18:32:08,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-08 18:32:08,322 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:08,322 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:08,322 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:08,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:08,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-12-08 18:32:08,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:08,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:08,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:08,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:08,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:08,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:08,382 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-08 18:32:08,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:08,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:08,382 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:08,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:08,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:08,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:08,388 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:32:08,388 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:32:08,400 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:32:08,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:08,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:08,411 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-08 18:32:08,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:09,304 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-08 18:32:09,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:09,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-12-08 18:32:09,319 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:09,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-08 18:32:09,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-08 18:32:09,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-12-08 18:32:09,320 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-12-08 18:32:09,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:09,390 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-12-08 18:32:09,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-08 18:32:09,390 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-12-08 18:32:09,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:09,391 INFO L225 Difference]: With dead ends: 40 [2018-12-08 18:32:09,391 INFO L226 Difference]: Without dead ends: 36 [2018-12-08 18:32:09,392 INFO L631 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 [2018-12-08 18:32:09,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-08 18:32:09,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-08 18:32:09,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-08 18:32:09,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-08 18:32:09,396 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-12-08 18:32:09,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:09,396 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-08 18:32:09,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-08 18:32:09,397 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-08 18:32:09,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-08 18:32:09,397 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:09,397 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:09,398 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:09,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:09,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-12-08 18:32:09,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:09,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:09,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:09,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:09,399 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:09,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:09,471 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-08 18:32:09,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:09,471 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:09,471 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:09,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:09,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:09,472 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:09,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:09,477 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:09,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:09,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:09,502 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-08 18:32:09,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-12-08 18:32:10,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:10,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-12-08 18:32:10,607 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:10,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-08 18:32:10,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-08 18:32:10,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-12-08 18:32:10,608 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-12-08 18:32:10,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:10,681 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-08 18:32:10,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-08 18:32:10,682 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-12-08 18:32:10,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:10,682 INFO L225 Difference]: With dead ends: 43 [2018-12-08 18:32:10,682 INFO L226 Difference]: Without dead ends: 39 [2018-12-08 18:32:10,683 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-12-08 18:32:10,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-08 18:32:10,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-08 18:32:10,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-08 18:32:10,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-08 18:32:10,685 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-12-08 18:32:10,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:10,685 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-08 18:32:10,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-08 18:32:10,686 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-08 18:32:10,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-08 18:32:10,686 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:10,686 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:10,686 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:10,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:10,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-12-08 18:32:10,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:10,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:10,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:10,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:10,687 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:10,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:10,753 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-08 18:32:10,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:10,754 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:10,754 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:10,754 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:10,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:10,754 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:10,759 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:10,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:10,774 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-08 18:32:10,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:10,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:10,787 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-08 18:32:10,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:12,283 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-12-08 18:32:12,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:12,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-12-08 18:32:12,298 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:12,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-08 18:32:12,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-08 18:32:12,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-08 18:32:12,299 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-12-08 18:32:12,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:12,380 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-12-08 18:32:12,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-08 18:32:12,380 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-12-08 18:32:12,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:12,381 INFO L225 Difference]: With dead ends: 46 [2018-12-08 18:32:12,381 INFO L226 Difference]: Without dead ends: 42 [2018-12-08 18:32:12,381 INFO L631 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 [2018-12-08 18:32:12,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-08 18:32:12,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-08 18:32:12,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-08 18:32:12,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-08 18:32:12,385 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-12-08 18:32:12,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:12,385 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-08 18:32:12,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-08 18:32:12,385 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-08 18:32:12,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-08 18:32:12,386 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:12,386 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:12,386 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:12,386 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:12,386 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-12-08 18:32:12,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:12,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:12,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:12,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:12,387 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:12,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-08 18:32:12,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:12,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:12,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:12,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:12,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:12,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:12,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:32:12,466 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:32:12,478 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:32:12,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:12,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:12,488 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-08 18:32:12,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:14,497 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-12-08 18:32:14,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:14,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-12-08 18:32:14,511 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:14,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-08 18:32:14,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-08 18:32:14,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-12-08 18:32:14,512 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-12-08 18:32:14,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:14,591 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-08 18:32:14,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-08 18:32:14,591 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-08 18:32:14,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:14,592 INFO L225 Difference]: With dead ends: 49 [2018-12-08 18:32:14,592 INFO L226 Difference]: Without dead ends: 45 [2018-12-08 18:32:14,592 INFO L631 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 [2018-12-08 18:32:14,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-08 18:32:14,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-08 18:32:14,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-08 18:32:14,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-08 18:32:14,595 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-12-08 18:32:14,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:14,595 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-08 18:32:14,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-08 18:32:14,595 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-08 18:32:14,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-08 18:32:14,596 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:14,596 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:14,596 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:14,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:14,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-12-08 18:32:14,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:14,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:14,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:14,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:14,597 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:14,683 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-08 18:32:14,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:14,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:14,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:14,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:14,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:14,684 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:14,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:14,691 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:14,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:14,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:14,715 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-08 18:32:14,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:17,223 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-12-08 18:32:17,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:17,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-12-08 18:32:17,237 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:17,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-08 18:32:17,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-08 18:32:17,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-12-08 18:32:17,238 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-12-08 18:32:17,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:17,338 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-12-08 18:32:17,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-08 18:32:17,338 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-12-08 18:32:17,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:17,339 INFO L225 Difference]: With dead ends: 52 [2018-12-08 18:32:17,339 INFO L226 Difference]: Without dead ends: 48 [2018-12-08 18:32:17,339 INFO L631 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 [2018-12-08 18:32:17,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-08 18:32:17,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-08 18:32:17,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-08 18:32:17,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-08 18:32:17,342 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-12-08 18:32:17,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:17,342 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-08 18:32:17,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-08 18:32:17,342 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-08 18:32:17,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-08 18:32:17,343 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:17,343 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:17,343 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:17,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:17,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-12-08 18:32:17,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:17,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:17,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:17,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:17,344 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:17,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:17,428 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-08 18:32:17,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:17,428 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:17,428 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:17,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:17,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:17,429 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:17,434 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:17,434 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:17,453 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-08 18:32:17,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:17,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:17,464 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-08 18:32:17,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:20,677 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-12-08 18:32:20,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:20,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-12-08 18:32:20,692 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:20,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-08 18:32:20,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-08 18:32:20,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-12-08 18:32:20,693 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-12-08 18:32:20,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:20,800 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-08 18:32:20,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-08 18:32:20,801 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-12-08 18:32:20,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:20,801 INFO L225 Difference]: With dead ends: 55 [2018-12-08 18:32:20,801 INFO L226 Difference]: Without dead ends: 51 [2018-12-08 18:32:20,802 INFO L631 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 [2018-12-08 18:32:20,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-08 18:32:20,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-08 18:32:20,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-08 18:32:20,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-08 18:32:20,804 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-12-08 18:32:20,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:20,804 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-08 18:32:20,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-08 18:32:20,805 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-08 18:32:20,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-08 18:32:20,805 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:20,805 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:20,805 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:20,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:20,805 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-12-08 18:32:20,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:20,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:20,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:20,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:20,806 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:20,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:20,901 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-08 18:32:20,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:20,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:20,901 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:20,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:20,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:20,902 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:20,908 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:32:20,908 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:32:20,923 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:32:20,923 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:20,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:20,934 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-08 18:32:20,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:25,004 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-12-08 18:32:25,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:25,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-12-08 18:32:25,018 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:25,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-08 18:32:25,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-08 18:32:25,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-12-08 18:32:25,019 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-12-08 18:32:25,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:25,140 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-12-08 18:32:25,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-08 18:32:25,140 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-12-08 18:32:25,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:25,140 INFO L225 Difference]: With dead ends: 58 [2018-12-08 18:32:25,140 INFO L226 Difference]: Without dead ends: 54 [2018-12-08 18:32:25,141 INFO L631 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 [2018-12-08 18:32:25,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-08 18:32:25,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-08 18:32:25,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-08 18:32:25,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-08 18:32:25,145 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-12-08 18:32:25,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:25,145 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-08 18:32:25,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-08 18:32:25,146 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-08 18:32:25,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-08 18:32:25,146 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:25,146 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:25,147 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:25,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:25,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-12-08 18:32:25,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:25,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:25,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:25,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:25,148 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:25,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:25,251 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-08 18:32:25,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:25,251 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:25,251 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:25,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:25,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:25,251 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:25,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:25,258 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:25,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:25,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:25,285 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-08 18:32:25,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:30,529 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-12-08 18:32:30,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:30,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-12-08 18:32:30,549 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:30,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-08 18:32:30,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-08 18:32:30,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-12-08 18:32:30,550 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-12-08 18:32:30,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:30,722 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-08 18:32:30,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-08 18:32:30,723 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-12-08 18:32:30,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:30,723 INFO L225 Difference]: With dead ends: 61 [2018-12-08 18:32:30,723 INFO L226 Difference]: Without dead ends: 57 [2018-12-08 18:32:30,724 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-12-08 18:32:30,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-08 18:32:30,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-08 18:32:30,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-08 18:32:30,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-08 18:32:30,728 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-12-08 18:32:30,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:30,729 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-08 18:32:30,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-08 18:32:30,729 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-08 18:32:30,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-08 18:32:30,729 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:30,729 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:30,730 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:30,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:30,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-12-08 18:32:30,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:30,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:30,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:30,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:30,730 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:30,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:30,870 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-08 18:32:30,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:30,870 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:30,870 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:30,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:30,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:30,870 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:30,877 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:30,877 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:30,904 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-08 18:32:30,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:30,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:30,922 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-08 18:32:30,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:37,624 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-12-08 18:32:37,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:37,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-12-08 18:32:37,638 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:37,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-08 18:32:37,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-08 18:32:37,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-12-08 18:32:37,639 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-12-08 18:32:37,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:37,780 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-12-08 18:32:37,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-08 18:32:37,780 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-12-08 18:32:37,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:37,781 INFO L225 Difference]: With dead ends: 64 [2018-12-08 18:32:37,781 INFO L226 Difference]: Without dead ends: 60 [2018-12-08 18:32:37,782 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-12-08 18:32:37,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-08 18:32:37,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-08 18:32:37,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-08 18:32:37,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-08 18:32:37,785 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-12-08 18:32:37,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:37,785 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-08 18:32:37,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-08 18:32:37,785 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-08 18:32:37,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-08 18:32:37,786 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:37,786 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:37,786 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:37,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:37,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-12-08 18:32:37,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:37,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:37,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:37,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:37,787 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:37,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:37,894 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-08 18:32:37,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:37,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:37,894 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:37,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:37,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:37,894 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/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 [2018-12-08 18:32:37,900 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:32:37,900 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:32:37,918 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:32:37,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:37,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:37,933 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-08 18:32:37,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:47,378 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-12-08 18:32:47,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:47,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-12-08 18:32:47,393 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:47,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-08 18:32:47,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-08 18:32:47,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-12-08 18:32:47,394 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-12-08 18:32:47,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:47,551 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-08 18:32:47,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-08 18:32:47,551 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-12-08 18:32:47,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:47,552 INFO L225 Difference]: With dead ends: 67 [2018-12-08 18:32:47,552 INFO L226 Difference]: Without dead ends: 63 [2018-12-08 18:32:47,553 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-12-08 18:32:47,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-08 18:32:47,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-08 18:32:47,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-08 18:32:47,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-08 18:32:47,556 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-12-08 18:32:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:47,557 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-08 18:32:47,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-08 18:32:47,557 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-08 18:32:47,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-08 18:32:47,557 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:47,558 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:47,558 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:47,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:47,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2018-12-08 18:32:47,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:47,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:47,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:32:47,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:47,559 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:47,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:47,683 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-08 18:32:47,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:47,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:47,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:47,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:47,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:47,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:47,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:47,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:32:47,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:47,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:47,722 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-08 18:32:47,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:32:58,397 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-12-08 18:32:58,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:32:58,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-12-08 18:32:58,412 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:32:58,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-08 18:32:58,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-08 18:32:58,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-12-08 18:32:58,413 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-12-08 18:32:58,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:32:58,596 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-12-08 18:32:58,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-08 18:32:58,596 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-12-08 18:32:58,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:32:58,597 INFO L225 Difference]: With dead ends: 70 [2018-12-08 18:32:58,597 INFO L226 Difference]: Without dead ends: 66 [2018-12-08 18:32:58,598 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-12-08 18:32:58,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-08 18:32:58,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-08 18:32:58,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-08 18:32:58,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-08 18:32:58,601 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-12-08 18:32:58,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:32:58,601 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-08 18:32:58,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-08 18:32:58,601 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-08 18:32:58,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-08 18:32:58,601 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:32:58,601 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:32:58,602 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:32:58,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:32:58,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2018-12-08 18:32:58,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:32:58,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:58,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:32:58,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:32:58,602 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:32:58,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:32:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-08 18:32:58,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:58,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:32:58,743 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:32:58,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:32:58,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:32:58,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:32:58,750 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:32:58,750 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:32:58,785 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-08 18:32:58,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:32:58,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:32:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-08 18:32:58,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:33:00,642 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-08 18:33:00,757 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-08 18:33:00,881 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-08 18:33:01,004 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-08 18:33:01,131 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-08 18:33:01,256 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-08 18:33:02,902 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-12-08 18:33:03,013 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-12-08 18:33:03,136 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-12-08 18:33:03,246 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-12-08 18:33:11,427 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2018-12-08 18:33:15,497 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-12-08 18:33:15,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:33:15,514 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-12-08 18:33:15,514 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:33:15,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-08 18:33:15,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-08 18:33:15,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-12-08 18:33:15,515 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-12-08 18:33:15,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:33:15,712 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-08 18:33:15,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-08 18:33:15,712 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-12-08 18:33:15,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:33:15,713 INFO L225 Difference]: With dead ends: 73 [2018-12-08 18:33:15,713 INFO L226 Difference]: Without dead ends: 69 [2018-12-08 18:33:15,714 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-12-08 18:33:15,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-08 18:33:15,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-08 18:33:15,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-08 18:33:15,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-08 18:33:15,718 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-12-08 18:33:15,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:33:15,718 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-08 18:33:15,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-08 18:33:15,718 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-08 18:33:15,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-08 18:33:15,719 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:33:15,720 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:33:15,720 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:33:15,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:33:15,720 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2018-12-08 18:33:15,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:33:15,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:15,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:33:15,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:15,721 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:33:15,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:33:15,875 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-08 18:33:15,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:15,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:33:15,875 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:33:15,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:33:15,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:15,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:33:15,881 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:33:15,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:33:15,902 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:33:15,902 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:33:15,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:33:15,917 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-08 18:33:15,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:33:17,842 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:33:30,277 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-12-08 18:33:30,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:33:30,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-12-08 18:33:30,292 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:33:30,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-08 18:33:30,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-08 18:33:30,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-12-08 18:33:30,292 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-12-08 18:33:30,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:33:30,502 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-12-08 18:33:30,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-08 18:33:30,502 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-12-08 18:33:30,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:33:30,503 INFO L225 Difference]: With dead ends: 76 [2018-12-08 18:33:30,503 INFO L226 Difference]: Without dead ends: 72 [2018-12-08 18:33:30,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-12-08 18:33:30,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-08 18:33:30,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-08 18:33:30,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-08 18:33:30,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-08 18:33:30,506 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-12-08 18:33:30,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:33:30,506 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-08 18:33:30,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-08 18:33:30,506 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-08 18:33:30,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-08 18:33:30,506 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:33:30,506 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:33:30,506 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:33:30,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:33:30,507 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2018-12-08 18:33:30,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:33:30,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:30,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:33:30,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:30,507 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:33:30,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:33:30,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-08 18:33:30,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:30,663 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:33:30,663 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:33:30,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:33:30,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:30,663 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:33:30,669 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:33:30,669 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:33:30,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:33:30,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:33:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-08 18:33:30,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:33:39,892 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:33:48,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-12-08 18:33:48,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:33:48,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2018-12-08 18:33:48,757 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:33:48,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-08 18:33:48,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-08 18:33:48,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2018-12-08 18:33:48,758 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-12-08 18:33:48,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:33:48,927 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-08 18:33:48,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-08 18:33:48,928 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-12-08 18:33:48,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:33:48,928 INFO L225 Difference]: With dead ends: 79 [2018-12-08 18:33:48,928 INFO L226 Difference]: Without dead ends: 75 [2018-12-08 18:33:48,929 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 40 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2018-12-08 18:33:48,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-08 18:33:48,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-08 18:33:48,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-08 18:33:48,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-08 18:33:48,931 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-12-08 18:33:48,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:33:48,931 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-08 18:33:48,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-08 18:33:48,931 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-08 18:33:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-08 18:33:48,932 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:33:48,932 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:33:48,932 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:33:48,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:33:48,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2018-12-08 18:33:48,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:33:48,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:48,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:33:48,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:33:48,933 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:33:48,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:33:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-08 18:33:49,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:49,109 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:33:49,109 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:33:49,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:33:49,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:33:49,109 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:33:49,114 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:33:49,114 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:33:49,149 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-08 18:33:49,149 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:33:49,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:33:49,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-08 18:33:49,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:34:00,762 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:34:00,876 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:34:01,001 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:34:09,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 1010 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-12-08 18:34:09,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:34:09,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 47 [2018-12-08 18:34:09,379 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:34:09,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-08 18:34:09,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-08 18:34:09,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=1608, Unknown=0, NotChecked=0, Total=2162 [2018-12-08 18:34:09,380 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-12-08 18:34:09,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:34:09,602 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-12-08 18:34:09,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-08 18:34:09,603 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-12-08 18:34:09,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:34:09,603 INFO L225 Difference]: With dead ends: 82 [2018-12-08 18:34:09,603 INFO L226 Difference]: Without dead ends: 78 [2018-12-08 18:34:09,604 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 223 SyntacticMatches, 42 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1499, Invalid=3057, Unknown=0, NotChecked=0, Total=4556 [2018-12-08 18:34:09,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-08 18:34:09,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-08 18:34:09,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-08 18:34:09,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-08 18:34:09,607 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-12-08 18:34:09,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:34:09,607 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-08 18:34:09,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-08 18:34:09,607 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-08 18:34:09,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-08 18:34:09,608 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:34:09,608 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:34:09,608 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:34:09,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:34:09,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1648275844, now seen corresponding path program 21 times [2018-12-08 18:34:09,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:34:09,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:34:09,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:34:09,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:34:09,609 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:34:09,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:34:09,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-12-08 18:34:09,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:34:09,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:34:09,799 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:34:09,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:34:09,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:34:09,799 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:34:09,807 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:34:09,807 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:34:09,831 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:34:09,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:34:09,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:34:09,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-12-08 18:34:09,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:34:11,057 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-12-08 18:34:11,170 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:11,282 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:11,405 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:11,522 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:11,661 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:11,793 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:11,930 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:34:12,067 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:34:13,172 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:34:19,088 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:34:19,195 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:34:19,306 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:34:19,468 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:34:19,683 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:34:19,897 WARN L180 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:34:20,115 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:34:20,339 WARN L180 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:34:22,425 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-12-08 18:34:22,728 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-12-08 18:34:22,837 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-12-08 18:34:22,940 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-12-08 18:34:23,045 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:35,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-12-08 18:34:35,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:34:35,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2018-12-08 18:34:35,821 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:34:35,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-08 18:34:35,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-08 18:34:35,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2018-12-08 18:34:35,822 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-12-08 18:34:36,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:34:36,125 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-08 18:34:36,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-08 18:34:36,125 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-12-08 18:34:36,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:34:36,126 INFO L225 Difference]: With dead ends: 85 [2018-12-08 18:34:36,126 INFO L226 Difference]: Without dead ends: 81 [2018-12-08 18:34:36,127 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 233 SyntacticMatches, 44 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2018-12-08 18:34:36,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-08 18:34:36,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-08 18:34:36,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-08 18:34:36,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-08 18:34:36,130 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-12-08 18:34:36,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:34:36,130 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-08 18:34:36,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-08 18:34:36,130 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-08 18:34:36,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-12-08 18:34:36,131 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:34:36,131 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:34:36,131 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:34:36,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:34:36,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1314278308, now seen corresponding path program 22 times [2018-12-08 18:34:36,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:34:36,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:34:36,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:34:36,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:34:36,132 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:34:36,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:34:36,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-12-08 18:34:36,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:34:36,324 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:34:36,324 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:34:36,324 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:34:36,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:34:36,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:34:36,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:34:36,330 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:34:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:34:36,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:34:36,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-12-08 18:34:36,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:34:38,503 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:34:38,616 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:34:38,749 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:34:38,882 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:34:39,023 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:34:39,540 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:34:39,651 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:34:39,769 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2018-12-08 18:34:39,891 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2018-12-08 18:34:40,047 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2018-12-08 18:34:40,152 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2018-12-08 18:34:43,702 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2018-12-08 18:34:45,309 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:45,417 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:45,525 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:45,629 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:45,737 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:45,856 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:45,993 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:34:46,145 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:34:46,283 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:34:46,423 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:34:46,570 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:34:46,712 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:34:46,869 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:34:47,019 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:34:47,199 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-08 18:34:55,025 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-12-08 18:34:55,426 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:55,558 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2018-12-08 18:34:55,690 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:55,807 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-12-08 18:34:55,944 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:56,063 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:34:56,974 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-08 18:34:57,080 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-08 18:34:57,182 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-08 18:34:57,311 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:34:57,446 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:35:07,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-12-08 18:35:07,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:35:07,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2018-12-08 18:35:07,305 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:35:07,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-08 18:35:07,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-08 18:35:07,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2018-12-08 18:35:07,306 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-12-08 18:35:07,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:35:07,571 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-12-08 18:35:07,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-08 18:35:07,571 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-12-08 18:35:07,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:35:07,572 INFO L225 Difference]: With dead ends: 88 [2018-12-08 18:35:07,572 INFO L226 Difference]: Without dead ends: 84 [2018-12-08 18:35:07,573 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 243 SyntacticMatches, 46 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2018-12-08 18:35:07,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-08 18:35:07,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-12-08 18:35:07,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-08 18:35:07,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-08 18:35:07,576 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-12-08 18:35:07,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:35:07,576 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-08 18:35:07,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-08 18:35:07,576 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-08 18:35:07,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-12-08 18:35:07,576 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:35:07,577 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:35:07,577 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:35:07,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:35:07,577 INFO L82 PathProgramCache]: Analyzing trace with hash 2015638980, now seen corresponding path program 23 times [2018-12-08 18:35:07,577 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:35:07,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:35:07,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:35:07,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:35:07,577 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:35:07,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:35:07,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-12-08 18:35:07,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:35:07,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:35:07,791 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:35:07,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:35:07,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:35:07,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:35:07,797 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 18:35:07,797 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-08 18:35:07,837 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-08 18:35:07,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:35:07,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:35:07,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-12-08 18:35:07,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:35:10,278 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:35:10,392 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:35:10,505 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:35:10,662 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:35:10,853 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:35:11,062 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:11,212 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:21,168 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:35:21,299 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:35:31,345 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-08 18:35:31,461 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-08 18:35:40,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-12-08 18:35:40,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:35:40,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2018-12-08 18:35:40,456 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:35:40,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-08 18:35:40,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-08 18:35:40,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2018-12-08 18:35:40,457 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-12-08 18:35:40,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:35:40,721 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-08 18:35:40,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-08 18:35:40,722 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-12-08 18:35:40,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:35:40,722 INFO L225 Difference]: With dead ends: 91 [2018-12-08 18:35:40,722 INFO L226 Difference]: Without dead ends: 87 [2018-12-08 18:35:40,723 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 253 SyntacticMatches, 48 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2018-12-08 18:35:40,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-08 18:35:40,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-08 18:35:40,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-08 18:35:40,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-08 18:35:40,725 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-12-08 18:35:40,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:35:40,725 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-08 18:35:40,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-08 18:35:40,725 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-08 18:35:40,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-12-08 18:35:40,725 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:35:40,725 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:35:40,726 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:35:40,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:35:40,726 INFO L82 PathProgramCache]: Analyzing trace with hash 483163804, now seen corresponding path program 24 times [2018-12-08 18:35:40,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:35:40,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:35:40,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:35:40,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:35:40,726 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:35:40,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:35:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-12-08 18:35:40,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:35:40,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:35:40,948 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:35:40,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:35:40,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:35:40,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:35:40,954 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 18:35:40,954 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-08 18:35:40,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 18:35:40,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 18:35:40,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:35:41,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-12-08 18:35:41,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:35:44,697 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2018-12-08 18:35:44,798 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2018-12-08 18:35:47,143 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:35:47,255 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:35:47,366 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:35:47,497 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:35:47,642 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-08 18:35:47,787 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:47,957 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:48,131 WARN L180 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-08 18:35:49,258 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2018-12-08 18:35:49,365 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2018-12-08 18:35:55,139 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:55,249 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:35:55,379 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-08 18:35:55,505 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-08 18:35:55,633 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:35:55,762 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:35:55,899 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2018-12-08 18:35:56,033 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2018-12-08 18:35:56,180 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2018-12-08 18:35:56,328 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2018-12-08 18:35:57,915 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-12-08 18:35:58,236 WARN L180 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-12-08 18:36:05,113 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:36:05,237 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:36:05,366 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:36:05,521 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:36:05,691 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:36:05,813 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:36:11,067 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:36:11,193 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2018-12-08 18:36:11,329 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:36:11,464 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:36:11,602 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:36:11,746 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:36:11,901 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:36:12,040 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2018-12-08 18:36:12,199 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:36:12,358 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:36:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2018-12-08 18:36:20,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:36:20,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2018-12-08 18:36:20,309 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:36:20,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-08 18:36:20,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-08 18:36:20,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2018-12-08 18:36:20,310 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-12-08 18:36:20,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:36:20,605 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-12-08 18:36:20,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-08 18:36:20,605 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-12-08 18:36:20,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:36:20,606 INFO L225 Difference]: With dead ends: 94 [2018-12-08 18:36:20,606 INFO L226 Difference]: Without dead ends: 90 [2018-12-08 18:36:20,606 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 263 SyntacticMatches, 51 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2018-12-08 18:36:20,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-12-08 18:36:20,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-12-08 18:36:20,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-08 18:36:20,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-08 18:36:20,609 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-12-08 18:36:20,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:36:20,609 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-08 18:36:20,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-08 18:36:20,609 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-08 18:36:20,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-08 18:36:20,610 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 18:36:20,610 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 18:36:20,610 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 18:36:20,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 18:36:20,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1060706820, now seen corresponding path program 25 times [2018-12-08 18:36:20,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-08 18:36:20,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:36:20,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 18:36:20,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 18:36:20,611 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-08 18:36:20,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:36:21,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 999 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-12-08 18:36:21,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:36:21,860 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-08 18:36:21,860 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-08 18:36:21,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-08 18:36:21,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 18:36:21,860 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-08 18:36:21,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 18:36:21,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-08 18:36:21,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 18:36:21,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 18:36:24,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 949 proven. 50 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-12-08 18:36:24,800 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 18:36:27,557 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:36:27,708 WARN L180 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2018-12-08 18:36:28,782 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-12-08 18:36:28,982 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:29,092 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:29,216 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-12-08 18:36:29,322 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2018-12-08 18:36:29,439 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-12-08 18:36:29,562 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-12-08 18:36:29,707 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 141 [2018-12-08 18:36:29,834 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2018-12-08 18:36:29,979 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-08 18:36:30,144 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-08 18:36:33,180 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-08 18:36:34,406 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-12-08 18:36:34,607 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:34,716 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:34,850 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-12-08 18:36:34,969 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2018-12-08 18:36:35,116 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-12-08 18:36:35,264 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-12-08 18:36:39,380 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-12-08 18:36:39,482 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2018-12-08 18:36:39,591 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:39,694 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-12-08 18:36:46,038 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2018-12-08 18:36:46,264 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:36:46,431 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:36:46,662 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2018-12-08 18:36:46,841 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-08 18:36:47,071 WARN L180 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:36:47,314 WARN L180 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-08 18:36:47,587 WARN L180 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2018-12-08 18:36:47,784 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-08 18:36:48,030 WARN L180 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:36:48,276 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-08 18:36:48,444 WARN L180 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 111 [2018-12-08 18:37:02,603 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-08 18:37:04,736 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2018-12-08 18:37:04,870 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:37:05,014 WARN L180 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:37:08,048 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:37:08,193 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-08 18:37:08,347 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2018-12-08 18:37:08,486 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-08 18:37:08,667 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:37:08,810 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-08 18:37:21,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 900 proven. 675 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-12-08 18:37:21,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-08 18:37:21,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 83] total 193 [2018-12-08 18:37:21,844 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-08 18:37:21,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-08 18:37:21,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-08 18:37:21,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4821, Invalid=32235, Unknown=0, NotChecked=0, Total=37056 [2018-12-08 18:37:21,847 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 116 states. [2018-12-08 18:37:26,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 18:37:26,499 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-12-08 18:37:26,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-08 18:37:26,499 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 163 [2018-12-08 18:37:26,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 18:37:26,499 INFO L225 Difference]: With dead ends: 93 [2018-12-08 18:37:26,499 INFO L226 Difference]: Without dead ends: 0 [2018-12-08 18:37:26,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11061 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=8862, Invalid=51900, Unknown=0, NotChecked=0, Total=60762 [2018-12-08 18:37:26,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-08 18:37:26,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-08 18:37:26,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-08 18:37:26,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-08 18:37:26,503 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 163 [2018-12-08 18:37:26,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 18:37:26,503 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-08 18:37:26,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-08 18:37:26,503 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-08 18:37:26,503 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-08 18:37:26,507 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-08 18:37:26,535 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-08 18:37:26,535 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-08 18:37:26,535 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-08 18:37:26,535 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-08 18:37:26,535 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-08 18:37:26,535 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-08 18:37:26,535 INFO L448 ceAbstractionStarter]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2018-12-08 18:37:26,535 INFO L444 ceAbstractionStarter]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (= sum_~n |sum_#in~n|) (< 0 sum_~n)) [2018-12-08 18:37:26,535 INFO L448 ceAbstractionStarter]: For program point L7-1(line 7) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point L4(lines 4 8) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L451 ceAbstractionStarter]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2018-12-08 18:37:26,536 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point L16(line 16) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 17) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L444 ceAbstractionStarter]: At program point L14(line 14) the Hoare annotation is: (and (<= main_~a~0 25) (<= 25 main_~a~0)) [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point L14-1(line 14) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2018-12-08 18:37:26,536 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2018-12-08 18:37:26,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 08.12 06:37:26 BoogieIcfgContainer [2018-12-08 18:37:26,538 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-08 18:37:26,538 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-08 18:37:26,538 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-08 18:37:26,538 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-08 18:37:26,538 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 06:32:05" (3/4) ... [2018-12-08 18:37:26,540 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-08 18:37:26,544 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-08 18:37:26,544 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2018-12-08 18:37:26,544 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-08 18:37:26,546 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-08 18:37:26,547 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-12-08 18:37:26,547 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-08 18:37:26,567 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_fa9134e3-919f-435e-80e1-08ab22537102/bin-2019/utaipan/witness.graphml [2018-12-08 18:37:26,567 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-08 18:37:26,568 INFO L168 Benchmark]: Toolchain (without parser) took 321222.10 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 87.0 MB). Free memory was 958.8 MB in the beginning and 909.9 MB in the end (delta: 49.0 MB). Peak memory consumption was 136.0 MB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,568 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 18:37:26,568 INFO L168 Benchmark]: CACSL2BoogieTranslator took 130.77 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,568 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.65 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 18:37:26,568 INFO L168 Benchmark]: Boogie Preprocessor took 10.61 ms. Allocated memory is still 1.0 GB. Free memory was 948.1 MB in the beginning and 942.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,569 INFO L168 Benchmark]: RCFGBuilder took 149.23 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 942.7 MB in the beginning and 1.1 GB in the end (delta: -135.0 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,569 INFO L168 Benchmark]: TraceAbstraction took 320887.57 ms. Allocated memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -12.6 MB). Free memory was 1.1 GB in the beginning and 909.9 MB in the end (delta: 167.8 MB). Peak memory consumption was 155.3 MB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,569 INFO L168 Benchmark]: Witness Printer took 29.28 ms. Allocated memory is still 1.1 GB. Free memory was 909.9 MB in the beginning and 909.9 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. Max. memory is 11.5 GB. [2018-12-08 18:37:26,570 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 130.77 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.65 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.61 ms. Allocated memory is still 1.0 GB. Free memory was 948.1 MB in the beginning and 942.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 149.23 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 942.7 MB in the beginning and 1.1 GB in the end (delta: -135.0 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 320887.57 ms. Allocated memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -12.6 MB). Free memory was 1.1 GB in the beginning and 909.9 MB in the end (delta: 167.8 MB). Peak memory consumption was 155.3 MB. Max. memory is 11.5 GB. * Witness Printer took 29.28 ms. Allocated memory is still 1.1 GB. Free memory was 909.9 MB in the beginning and 909.9 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. 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, 320.8s OverallTime, 26 OverallIterations, 26 TraceHistogramMax, 8.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 337 SDtfs, 916 SDslu, 4588 SDs, 0 SdLazy, 5579 SolverSat, 326 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5712 GetRequests, 3767 SyntacticMatches, 653 SemanticMatches, 1292 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27235 ImplicationChecksByTransitivity, 27.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=25, 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, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 22 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 310.9s InterpolantComputationTime, 4563 NumberOfCodeBlocks, 4563 NumberOfCodeBlocksAsserted, 159 NumberOfCheckSat, 6762 ConstructedInterpolants, 0 QuantifiedInterpolants, 2869632 SizeOfPredicates, 404 NumberOfNonLiveVariables, 6750 ConjunctsInSsa, 963 ConjunctsInUnsatCore, 76 InterpolantComputations, 1 PerfectInterpolantSequences, 21576/50700 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...