./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loop-lit/gj2007_true-unreach-call_true-termination.c.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-lit/gj2007_true-unreach-call_true-termination.c.i -s /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 1a9963030a13e3c679db84f21688cc66372a5ac3 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-10-26 19:50:56,912 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 19:50:56,914 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 19:50:56,928 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 19:50:56,928 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 19:50:56,932 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 19:50:56,936 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 19:50:56,937 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 19:50:56,938 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 19:50:56,939 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 19:50:56,940 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 19:50:56,940 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 19:50:56,941 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 19:50:56,942 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 19:50:56,942 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 19:50:56,943 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 19:50:56,944 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 19:50:56,945 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 19:50:56,947 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 19:50:56,948 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 19:50:56,949 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 19:50:56,950 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 19:50:56,952 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 19:50:56,953 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 19:50:56,953 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 19:50:56,954 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 19:50:56,955 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 19:50:56,955 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 19:50:56,956 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 19:50:56,957 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 19:50:56,957 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 19:50:56,958 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 19:50:56,958 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 19:50:56,958 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 19:50:56,959 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 19:50:56,960 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 19:50:56,960 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-26 19:50:56,972 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 19:50:56,973 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 19:50:56,973 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 19:50:56,974 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-26 19:50:56,974 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-26 19:50:56,974 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-26 19:50:56,974 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-26 19:50:56,974 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-26 19:50:56,974 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-26 19:50:56,975 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-26 19:50:56,975 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-26 19:50:56,975 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 19:50:56,975 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 19:50:56,976 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 19:50:56,977 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 19:50:56,977 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 19:50:56,977 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 19:50:56,977 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 19:50:56,977 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 19:50:56,977 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 19:50:56,978 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-26 19:50:56,978 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 19:50:56,979 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 19:50:56,979 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 19:50:56,979 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_bb42fdc5-6816-48be-ac6f-046e7968f114/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 -> 1a9963030a13e3c679db84f21688cc66372a5ac3 [2018-10-26 19:50:57,018 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 19:50:57,027 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 19:50:57,031 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 19:50:57,032 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 19:50:57,033 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 19:50:57,033 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/../../sv-benchmarks/c/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-26 19:50:57,087 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/data/6514beef8/eb6141ed4c624a688c6f21251315cdc2/FLAG7fddb5e43 [2018-10-26 19:50:57,459 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 19:50:57,460 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/sv-benchmarks/c/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-26 19:50:57,466 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/data/6514beef8/eb6141ed4c624a688c6f21251315cdc2/FLAG7fddb5e43 [2018-10-26 19:50:57,478 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/data/6514beef8/eb6141ed4c624a688c6f21251315cdc2 [2018-10-26 19:50:57,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 19:50:57,482 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-26 19:50:57,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 19:50:57,483 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 19:50:57,487 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 19:50:57,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69c1ca1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57, skipping insertion in model container [2018-10-26 19:50:57,491 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,500 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 19:50:57,516 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 19:50:57,646 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:50:57,651 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 19:50:57,662 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:50:57,674 INFO L193 MainTranslator]: Completed translation [2018-10-26 19:50:57,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57 WrapperNode [2018-10-26 19:50:57,675 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 19:50:57,676 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 19:50:57,676 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 19:50:57,676 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 19:50:57,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,690 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,694 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 19:50:57,694 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 19:50:57,694 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 19:50:57,695 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 19:50:57,701 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,701 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,701 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,704 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,708 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,709 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... [2018-10-26 19:50:57,710 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 19:50:57,710 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 19:50:57,710 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 19:50:57,710 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 19:50:57,711 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:50:57,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 19:50:57,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 19:50:57,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 19:50:57,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 19:50:57,818 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 19:50:57,818 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 19:50:57,818 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-26 19:50:57,818 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-26 19:50:58,133 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 19:50:58,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:50:58 BoogieIcfgContainer [2018-10-26 19:50:58,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 19:50:58,135 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 19:50:58,135 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 19:50:58,138 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 19:50:58,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 07:50:57" (1/3) ... [2018-10-26 19:50:58,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45c1661f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:50:58, skipping insertion in model container [2018-10-26 19:50:58,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:50:57" (2/3) ... [2018-10-26 19:50:58,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45c1661f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:50:58, skipping insertion in model container [2018-10-26 19:50:58,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:50:58" (3/3) ... [2018-10-26 19:50:58,141 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007_true-unreach-call_true-termination.c.i [2018-10-26 19:50:58,150 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 19:50:58,157 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 19:50:58,173 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 19:50:58,203 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 19:50:58,204 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 19:50:58,204 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 19:50:58,204 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 19:50:58,204 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 19:50:58,204 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 19:50:58,204 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 19:50:58,204 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 19:50:58,221 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-26 19:50:58,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-26 19:50:58,226 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:58,227 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:58,229 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:58,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:58,238 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2018-10-26 19:50:58,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:58,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:58,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,288 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:50:58,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:58,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:58,353 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 19:50:58,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-26 19:50:58,353 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:50:58,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-26 19:50:58,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-26 19:50:58,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 19:50:58,379 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-26 19:50:58,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:50:58,402 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-26 19:50:58,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-26 19:50:58,404 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-26 19:50:58,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:50:58,417 INFO L225 Difference]: With dead ends: 32 [2018-10-26 19:50:58,417 INFO L226 Difference]: Without dead ends: 13 [2018-10-26 19:50:58,422 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 19:50:58,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-26 19:50:58,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-26 19:50:58,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-26 19:50:58,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-26 19:50:58,456 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-26 19:50:58,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:50:58,457 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-26 19:50:58,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-26 19:50:58,458 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-26 19:50:58,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-26 19:50:58,458 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:58,458 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:58,459 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:58,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:58,459 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-10-26 19:50:58,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:58,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:58,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,460 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:50:58,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:58,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:58,508 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 19:50:58,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-26 19:50:58,508 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:50:58,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 19:50:58,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 19:50:58,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 19:50:58,511 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-26 19:50:58,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:50:58,575 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-26 19:50:58,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 19:50:58,576 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-26 19:50:58,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:50:58,577 INFO L225 Difference]: With dead ends: 24 [2018-10-26 19:50:58,577 INFO L226 Difference]: Without dead ends: 16 [2018-10-26 19:50:58,578 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 19:50:58,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-26 19:50:58,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-26 19:50:58,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-26 19:50:58,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-26 19:50:58,586 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-26 19:50:58,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:50:58,586 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-26 19:50:58,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 19:50:58,586 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-26 19:50:58,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-26 19:50:58,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:58,587 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:58,587 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:58,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:58,588 INFO L82 PathProgramCache]: Analyzing trace with hash 64649018, now seen corresponding path program 1 times [2018-10-26 19:50:58,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:58,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:58,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:58,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:50:58,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:58,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:58,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:50:58,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:50:58,701 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-26 19:50:58,702 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [27], [30], [32], [38], [39], [40], [42] [2018-10-26 19:50:58,746 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 19:50:58,746 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 19:50:58,889 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-26 19:50:58,890 INFO L272 AbstractInterpreter]: Visited 9 different actions 41 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-26 19:50:58,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:58,901 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-26 19:50:58,944 INFO L219 lantSequenceWeakener]: Could never weaken! [2018-10-26 19:50:58,945 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-26 19:50:58,976 INFO L415 sIntCurrentIteration]: We unified 13 AI predicates to 13 [2018-10-26 19:50:58,977 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-26 19:50:58,977 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-26 19:50:58,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2018-10-26 19:50:58,978 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:50:58,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 19:50:58,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 19:50:58,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 19:50:58,979 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 3 states. [2018-10-26 19:50:59,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:50:59,059 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2018-10-26 19:50:59,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 19:50:59,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-10-26 19:50:59,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:50:59,060 INFO L225 Difference]: With dead ends: 24 [2018-10-26 19:50:59,060 INFO L226 Difference]: Without dead ends: 19 [2018-10-26 19:50:59,060 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 19:50:59,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-26 19:50:59,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-26 19:50:59,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-26 19:50:59,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-26 19:50:59,066 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2018-10-26 19:50:59,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:50:59,066 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-26 19:50:59,066 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 19:50:59,066 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-26 19:50:59,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-26 19:50:59,067 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:59,067 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:59,067 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:59,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:59,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1506199393, now seen corresponding path program 1 times [2018-10-26 19:50:59,068 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:59,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:59,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,069 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:50:59,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:59,143 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:59,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:50:59,143 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:50:59,143 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-26 19:50:59,143 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [27], [30], [32], [38], [39], [40], [42] [2018-10-26 19:50:59,145 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 19:50:59,145 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 19:50:59,215 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-26 19:50:59,215 INFO L272 AbstractInterpreter]: Visited 14 different actions 67 times. Merged at 5 different actions 31 times. Widened at 2 different actions 6 times. Found 4 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-26 19:50:59,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:59,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-26 19:50:59,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:50:59,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:50:59,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:59,230 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:50:59,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:59,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:50:59,286 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:59,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:50:59,383 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:59,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:50:59,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-26 19:50:59,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:50:59,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-26 19:50:59,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-26 19:50:59,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 19:50:59,403 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2018-10-26 19:50:59,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:50:59,460 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-26 19:50:59,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-26 19:50:59,461 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-10-26 19:50:59,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:50:59,462 INFO L225 Difference]: With dead ends: 30 [2018-10-26 19:50:59,462 INFO L226 Difference]: Without dead ends: 22 [2018-10-26 19:50:59,462 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 19:50:59,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-26 19:50:59,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-26 19:50:59,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-26 19:50:59,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-26 19:50:59,468 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2018-10-26 19:50:59,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:50:59,468 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-26 19:50:59,468 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-26 19:50:59,468 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-26 19:50:59,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-26 19:50:59,469 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:59,469 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:59,469 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:59,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:59,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1748455324, now seen corresponding path program 2 times [2018-10-26 19:50:59,471 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:59,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:50:59,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,472 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:50:59,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:50:59,582 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:50:59,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:50:59,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:50:59,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:50:59,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:50:59,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:50:59,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:50:59,589 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:50:59,589 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:50:59,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-26 19:50:59,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:50:59,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:50:59,771 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-26 19:50:59,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:50:59,890 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-26 19:50:59,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:50:59,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2018-10-26 19:50:59,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:50:59,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 19:50:59,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 19:50:59,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-26 19:50:59,910 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2018-10-26 19:50:59,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:50:59,981 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2018-10-26 19:50:59,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 19:50:59,982 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-10-26 19:50:59,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:50:59,982 INFO L225 Difference]: With dead ends: 39 [2018-10-26 19:50:59,983 INFO L226 Difference]: Without dead ends: 31 [2018-10-26 19:50:59,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-26 19:50:59,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-26 19:50:59,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-10-26 19:50:59,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-26 19:50:59,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-26 19:50:59,990 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2018-10-26 19:50:59,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:50:59,991 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-26 19:50:59,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 19:50:59,991 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-26 19:50:59,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-26 19:50:59,993 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:50:59,993 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:50:59,993 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:50:59,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:50:59,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1522422854, now seen corresponding path program 3 times [2018-10-26 19:50:59,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:50:59,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:50:59,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:50:59,995 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:00,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:00,050 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 20 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:00,051 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:00,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:00,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:00,058 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:00,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:00,068 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:00,068 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:00,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:00,075 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 20 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:00,217 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 20 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:00,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-26 19:51:00,241 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:00,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 19:51:00,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 19:51:00,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-26 19:51:00,242 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 6 states. [2018-10-26 19:51:00,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:00,287 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2018-10-26 19:51:00,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 19:51:00,287 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2018-10-26 19:51:00,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:00,288 INFO L225 Difference]: With dead ends: 43 [2018-10-26 19:51:00,288 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 19:51:00,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-26 19:51:00,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 19:51:00,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-26 19:51:00,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 19:51:00,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-26 19:51:00,294 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 26 [2018-10-26 19:51:00,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:00,294 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-26 19:51:00,294 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 19:51:00,294 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-26 19:51:00,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-26 19:51:00,295 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:00,295 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:00,295 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:00,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:00,295 INFO L82 PathProgramCache]: Analyzing trace with hash 634861023, now seen corresponding path program 4 times [2018-10-26 19:51:00,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:00,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:00,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:00,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:00,297 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:00,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:00,372 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:00,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:00,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:00,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:00,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:00,382 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:00,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:00,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:00,398 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:00,804 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:00,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-26 19:51:00,823 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:00,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 19:51:00,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 19:51:00,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-26 19:51:00,824 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 7 states. [2018-10-26 19:51:00,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:00,863 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-26 19:51:00,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 19:51:00,864 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2018-10-26 19:51:00,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:00,865 INFO L225 Difference]: With dead ends: 46 [2018-10-26 19:51:00,865 INFO L226 Difference]: Without dead ends: 33 [2018-10-26 19:51:00,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-26 19:51:00,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-26 19:51:00,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-26 19:51:00,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-26 19:51:00,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-26 19:51:00,871 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-26 19:51:00,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:00,871 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-26 19:51:00,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 19:51:00,871 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-26 19:51:00,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-26 19:51:00,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:00,872 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:00,873 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:00,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:00,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1611776614, now seen corresponding path program 5 times [2018-10-26 19:51:00,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:00,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:00,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:00,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:00,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:00,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:00,958 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:51:00,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:00,959 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:00,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:00,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:00,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:00,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:00,968 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:00,981 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-26 19:51:00,982 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:00,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:01,013 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 40 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-26 19:51:01,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:01,090 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 40 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-26 19:51:01,108 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:01,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2018-10-26 19:51:01,108 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:01,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-26 19:51:01,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-26 19:51:01,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-26 19:51:01,109 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 11 states. [2018-10-26 19:51:01,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:01,238 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2018-10-26 19:51:01,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 19:51:01,239 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2018-10-26 19:51:01,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:01,241 INFO L225 Difference]: With dead ends: 53 [2018-10-26 19:51:01,241 INFO L226 Difference]: Without dead ends: 40 [2018-10-26 19:51:01,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-26 19:51:01,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-26 19:51:01,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-26 19:51:01,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-26 19:51:01,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-10-26 19:51:01,248 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 32 [2018-10-26 19:51:01,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:01,249 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-10-26 19:51:01,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-26 19:51:01,249 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-10-26 19:51:01,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-26 19:51:01,250 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:01,250 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:01,250 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:01,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:01,250 INFO L82 PathProgramCache]: Analyzing trace with hash 2007233660, now seen corresponding path program 6 times [2018-10-26 19:51:01,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:01,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:01,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:01,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:01,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:01,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:01,346 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 56 proven. 63 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:01,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:01,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:01,347 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:01,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:01,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:01,347 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:01,356 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:01,356 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:01,371 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:01,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:01,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:01,382 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 56 proven. 63 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:01,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 56 proven. 63 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:01,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:01,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-26 19:51:01,558 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:01,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 19:51:01,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 19:51:01,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-26 19:51:01,560 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2018-10-26 19:51:01,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:01,588 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2018-10-26 19:51:01,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 19:51:01,591 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 38 [2018-10-26 19:51:01,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:01,592 INFO L225 Difference]: With dead ends: 58 [2018-10-26 19:51:01,592 INFO L226 Difference]: Without dead ends: 42 [2018-10-26 19:51:01,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-26 19:51:01,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-26 19:51:01,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-26 19:51:01,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-26 19:51:01,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-26 19:51:01,602 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 38 [2018-10-26 19:51:01,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:01,603 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-26 19:51:01,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 19:51:01,603 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-26 19:51:01,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-26 19:51:01,604 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:01,604 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:01,604 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:01,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:01,604 INFO L82 PathProgramCache]: Analyzing trace with hash -617976031, now seen corresponding path program 7 times [2018-10-26 19:51:01,605 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:01,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:01,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:01,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:01,610 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:01,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:01,817 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 84 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:01,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:01,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:01,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:01,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:01,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:01,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:01,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:01,825 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:01,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:01,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:01,872 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 84 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:01,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:01,997 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 84 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:02,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:02,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-26 19:51:02,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:02,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-26 19:51:02,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-26 19:51:02,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-26 19:51:02,016 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 10 states. [2018-10-26 19:51:02,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:02,103 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-26 19:51:02,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-26 19:51:02,103 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-10-26 19:51:02,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:02,104 INFO L225 Difference]: With dead ends: 61 [2018-10-26 19:51:02,104 INFO L226 Difference]: Without dead ends: 45 [2018-10-26 19:51:02,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-26 19:51:02,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-26 19:51:02,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-26 19:51:02,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 19:51:02,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-26 19:51:02,112 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-10-26 19:51:02,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:02,112 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-26 19:51:02,112 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-26 19:51:02,113 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-26 19:51:02,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-26 19:51:02,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:02,113 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:02,114 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:02,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:02,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1180387748, now seen corresponding path program 8 times [2018-10-26 19:51:02,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:02,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:02,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:02,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:02,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:02,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:02,275 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:51:02,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:02,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:02,276 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:02,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:02,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:02,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:02,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:02,284 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:02,295 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-26 19:51:02,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:02,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:02,347 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-26 19:51:02,347 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:02,464 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-26 19:51:02,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:02,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 19 [2018-10-26 19:51:02,482 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:02,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 19:51:02,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 19:51:02,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-26 19:51:02,484 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 15 states. [2018-10-26 19:51:02,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:02,596 INFO L93 Difference]: Finished difference Result 68 states and 78 transitions. [2018-10-26 19:51:02,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 19:51:02,596 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2018-10-26 19:51:02,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:02,597 INFO L225 Difference]: With dead ends: 68 [2018-10-26 19:51:02,597 INFO L226 Difference]: Without dead ends: 52 [2018-10-26 19:51:02,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-26 19:51:02,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-26 19:51:02,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-26 19:51:02,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-26 19:51:02,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2018-10-26 19:51:02,605 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 44 [2018-10-26 19:51:02,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:02,606 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2018-10-26 19:51:02,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 19:51:02,606 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2018-10-26 19:51:02,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-26 19:51:02,607 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:02,607 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:02,607 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:02,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:02,607 INFO L82 PathProgramCache]: Analyzing trace with hash 451431418, now seen corresponding path program 9 times [2018-10-26 19:51:02,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:02,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:02,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:02,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:02,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:02,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:02,734 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:02,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:02,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:02,734 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:02,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:02,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:02,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:02,748 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:02,748 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:02,763 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:02,763 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:02,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:02,774 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:02,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:02,955 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:02,973 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:02,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-26 19:51:02,974 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:02,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-26 19:51:02,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-26 19:51:02,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-26 19:51:02,974 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 12 states. [2018-10-26 19:51:03,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:03,053 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2018-10-26 19:51:03,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-26 19:51:03,053 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2018-10-26 19:51:03,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:03,054 INFO L225 Difference]: With dead ends: 73 [2018-10-26 19:51:03,054 INFO L226 Difference]: Without dead ends: 54 [2018-10-26 19:51:03,055 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-26 19:51:03,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-26 19:51:03,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-26 19:51:03,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-26 19:51:03,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-26 19:51:03,061 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 50 [2018-10-26 19:51:03,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:03,061 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-26 19:51:03,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-26 19:51:03,061 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-26 19:51:03,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-26 19:51:03,065 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:03,066 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:03,066 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:03,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:03,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1862600929, now seen corresponding path program 10 times [2018-10-26 19:51:03,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:03,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:03,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:03,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:03,067 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:03,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:03,330 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:03,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:03,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:03,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:03,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:03,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:03,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:03,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:03,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:03,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:03,369 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:03,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:03,628 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:03,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:03,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-26 19:51:03,646 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:03,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-26 19:51:03,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-26 19:51:03,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:51:03,647 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 13 states. [2018-10-26 19:51:03,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:03,807 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-26 19:51:03,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-26 19:51:03,808 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 53 [2018-10-26 19:51:03,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:03,809 INFO L225 Difference]: With dead ends: 76 [2018-10-26 19:51:03,809 INFO L226 Difference]: Without dead ends: 57 [2018-10-26 19:51:03,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:51:03,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-26 19:51:03,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-26 19:51:03,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-26 19:51:03,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-26 19:51:03,817 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-26 19:51:03,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:03,817 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-26 19:51:03,817 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-26 19:51:03,819 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-26 19:51:03,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-26 19:51:03,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:03,820 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:03,820 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:03,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:03,820 INFO L82 PathProgramCache]: Analyzing trace with hash -680182310, now seen corresponding path program 11 times [2018-10-26 19:51:03,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:03,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:03,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:03,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:03,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:03,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:51:04,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:04,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:04,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:04,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:04,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:04,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:04,409 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:04,409 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:04,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-26 19:51:04,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:04,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:04,499 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 154 proven. 26 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-26 19:51:04,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:04,599 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 154 proven. 26 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-26 19:51:04,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:04,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7, 7] total 24 [2018-10-26 19:51:04,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:04,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-26 19:51:04,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-26 19:51:04,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:51:04,618 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 19 states. [2018-10-26 19:51:04,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:04,779 INFO L93 Difference]: Finished difference Result 83 states and 95 transitions. [2018-10-26 19:51:04,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 19:51:04,780 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2018-10-26 19:51:04,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:04,781 INFO L225 Difference]: With dead ends: 83 [2018-10-26 19:51:04,781 INFO L226 Difference]: Without dead ends: 64 [2018-10-26 19:51:04,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:51:04,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-26 19:51:04,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-26 19:51:04,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-26 19:51:04,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-26 19:51:04,794 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 56 [2018-10-26 19:51:04,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:04,795 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-26 19:51:04,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-26 19:51:04,795 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-26 19:51:04,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-26 19:51:04,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:04,796 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:04,796 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:04,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:04,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1651373252, now seen corresponding path program 12 times [2018-10-26 19:51:04,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:04,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:04,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:04,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:04,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:04,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:04,909 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 182 proven. 234 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:04,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:04,910 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:04,910 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:04,910 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:04,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:04,910 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:04,918 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:04,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:04,962 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:04,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:04,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:04,974 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 182 proven. 234 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:04,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 182 proven. 234 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:05,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:05,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-26 19:51:05,351 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:05,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 19:51:05,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 19:51:05,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-26 19:51:05,352 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 15 states. [2018-10-26 19:51:05,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:05,404 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2018-10-26 19:51:05,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 19:51:05,405 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 62 [2018-10-26 19:51:05,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:05,406 INFO L225 Difference]: With dead ends: 88 [2018-10-26 19:51:05,406 INFO L226 Difference]: Without dead ends: 66 [2018-10-26 19:51:05,407 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-26 19:51:05,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-26 19:51:05,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-26 19:51:05,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-26 19:51:05,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-26 19:51:05,411 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 62 [2018-10-26 19:51:05,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:05,412 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-26 19:51:05,412 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 19:51:05,412 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-26 19:51:05,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-26 19:51:05,413 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:05,413 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:05,413 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:05,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:05,413 INFO L82 PathProgramCache]: Analyzing trace with hash -2031343903, now seen corresponding path program 13 times [2018-10-26 19:51:05,413 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:05,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:05,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:05,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:05,419 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:05,578 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:05,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:05,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:05,578 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:05,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:05,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:05,579 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:05,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:05,586 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:05,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:05,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:05,628 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:05,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:05,952 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:05,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:05,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-26 19:51:05,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:05,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-26 19:51:05,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-26 19:51:05,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-26 19:51:05,971 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 16 states. [2018-10-26 19:51:06,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:06,029 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-10-26 19:51:06,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-26 19:51:06,031 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 65 [2018-10-26 19:51:06,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:06,031 INFO L225 Difference]: With dead ends: 91 [2018-10-26 19:51:06,032 INFO L226 Difference]: Without dead ends: 69 [2018-10-26 19:51:06,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-26 19:51:06,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-26 19:51:06,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-26 19:51:06,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-26 19:51:06,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-10-26 19:51:06,038 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-10-26 19:51:06,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:06,039 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-10-26 19:51:06,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-26 19:51:06,039 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-10-26 19:51:06,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-26 19:51:06,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:06,040 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:06,040 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:06,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:06,041 INFO L82 PathProgramCache]: Analyzing trace with hash -203215588, now seen corresponding path program 14 times [2018-10-26 19:51:06,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:06,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:06,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:06,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:06,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:06,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:06,206 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:51:06,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:06,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:06,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:06,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:06,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:06,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:06,214 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:06,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:06,225 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-26 19:51:06,225 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:06,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:06,320 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 238 proven. 40 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-26 19:51:06,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:06,420 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 238 proven. 40 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-26 19:51:06,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:06,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8, 8] total 29 [2018-10-26 19:51:06,438 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:06,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-26 19:51:06,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-26 19:51:06,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-26 19:51:06,439 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 23 states. [2018-10-26 19:51:06,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:06,790 INFO L93 Difference]: Finished difference Result 98 states and 112 transitions. [2018-10-26 19:51:06,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-26 19:51:06,791 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 68 [2018-10-26 19:51:06,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:06,791 INFO L225 Difference]: With dead ends: 98 [2018-10-26 19:51:06,792 INFO L226 Difference]: Without dead ends: 76 [2018-10-26 19:51:06,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-26 19:51:06,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-26 19:51:06,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-26 19:51:06,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-26 19:51:06,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2018-10-26 19:51:06,797 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 68 [2018-10-26 19:51:06,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:06,797 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2018-10-26 19:51:06,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-26 19:51:06,797 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2018-10-26 19:51:06,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-26 19:51:06,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:06,800 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:06,800 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:06,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:06,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1919493062, now seen corresponding path program 15 times [2018-10-26 19:51:06,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:06,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:06,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:06,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:06,801 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:06,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:07,217 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 272 proven. 360 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:07,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:07,217 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:07,218 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:07,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:07,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:07,218 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:07,225 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:07,225 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:07,240 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:07,241 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:07,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:07,253 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 272 proven. 360 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:07,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:07,652 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 272 proven. 360 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:07,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:07,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-26 19:51:07,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:07,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-26 19:51:07,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-26 19:51:07,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 19:51:07,671 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand 18 states. [2018-10-26 19:51:07,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:07,730 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2018-10-26 19:51:07,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-26 19:51:07,731 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 74 [2018-10-26 19:51:07,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:07,732 INFO L225 Difference]: With dead ends: 103 [2018-10-26 19:51:07,732 INFO L226 Difference]: Without dead ends: 78 [2018-10-26 19:51:07,733 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 19:51:07,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-26 19:51:07,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-26 19:51:07,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-26 19:51:07,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-10-26 19:51:07,738 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 74 [2018-10-26 19:51:07,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:07,739 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-10-26 19:51:07,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-26 19:51:07,739 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-10-26 19:51:07,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-26 19:51:07,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:07,740 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:07,740 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:07,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:07,740 INFO L82 PathProgramCache]: Analyzing trace with hash -871126945, now seen corresponding path program 16 times [2018-10-26 19:51:07,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:07,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:07,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:07,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:07,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:07,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:08,322 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 408 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:08,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:08,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:08,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:08,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:08,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:08,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:08,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:08,330 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:08,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:08,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:08,359 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 408 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:08,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:09,374 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 408 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:09,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:09,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-26 19:51:09,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:09,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-26 19:51:09,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-26 19:51:09,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-26 19:51:09,403 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 19 states. [2018-10-26 19:51:09,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:09,479 INFO L93 Difference]: Finished difference Result 106 states and 119 transitions. [2018-10-26 19:51:09,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 19:51:09,482 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 77 [2018-10-26 19:51:09,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:09,482 INFO L225 Difference]: With dead ends: 106 [2018-10-26 19:51:09,483 INFO L226 Difference]: Without dead ends: 81 [2018-10-26 19:51:09,483 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-26 19:51:09,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-26 19:51:09,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-10-26 19:51:09,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-26 19:51:09,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 87 transitions. [2018-10-26 19:51:09,493 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 87 transitions. Word has length 77 [2018-10-26 19:51:09,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:09,493 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 87 transitions. [2018-10-26 19:51:09,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-26 19:51:09,493 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 87 transitions. [2018-10-26 19:51:09,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-26 19:51:09,496 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:09,496 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:09,496 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:09,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:09,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1998311910, now seen corresponding path program 17 times [2018-10-26 19:51:09,497 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:09,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:09,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:09,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:09,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:09,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:09,709 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 459 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:51:09,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:09,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:09,709 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:09,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:09,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:09,710 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:09,717 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:09,717 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:09,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-26 19:51:09,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:09,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:10,451 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 340 proven. 57 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-26 19:51:10,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:10,581 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 340 proven. 57 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-26 19:51:10,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:10,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 9] total 34 [2018-10-26 19:51:10,598 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:10,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-26 19:51:10,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-26 19:51:10,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 19:51:10,599 INFO L87 Difference]: Start difference. First operand 81 states and 87 transitions. Second operand 27 states. [2018-10-26 19:51:10,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:10,840 INFO L93 Difference]: Finished difference Result 113 states and 129 transitions. [2018-10-26 19:51:10,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-26 19:51:10,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 80 [2018-10-26 19:51:10,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:10,842 INFO L225 Difference]: With dead ends: 113 [2018-10-26 19:51:10,842 INFO L226 Difference]: Without dead ends: 88 [2018-10-26 19:51:10,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 19:51:10,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-26 19:51:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-26 19:51:10,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-26 19:51:10,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2018-10-26 19:51:10,847 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 80 [2018-10-26 19:51:10,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:10,847 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2018-10-26 19:51:10,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-26 19:51:10,847 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2018-10-26 19:51:10,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-26 19:51:10,856 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:10,856 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:10,856 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:10,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:10,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1090859516, now seen corresponding path program 18 times [2018-10-26 19:51:10,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:10,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:10,857 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:10,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:10,858 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:10,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:11,035 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 380 proven. 513 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:11,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:11,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:11,036 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:11,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:11,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:11,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:11,044 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:11,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:11,058 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:11,058 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:11,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:11,068 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 380 proven. 513 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:11,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:11,428 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 380 proven. 513 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:11,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:11,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-26 19:51:11,446 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:11,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-26 19:51:11,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-26 19:51:11,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:51:11,447 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand 21 states. [2018-10-26 19:51:11,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:11,491 INFO L93 Difference]: Finished difference Result 118 states and 133 transitions. [2018-10-26 19:51:11,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-26 19:51:11,492 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 86 [2018-10-26 19:51:11,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:11,493 INFO L225 Difference]: With dead ends: 118 [2018-10-26 19:51:11,493 INFO L226 Difference]: Without dead ends: 90 [2018-10-26 19:51:11,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:51:11,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-26 19:51:11,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-26 19:51:11,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-26 19:51:11,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 97 transitions. [2018-10-26 19:51:11,498 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 97 transitions. Word has length 86 [2018-10-26 19:51:11,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:11,499 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 97 transitions. [2018-10-26 19:51:11,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-26 19:51:11,499 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 97 transitions. [2018-10-26 19:51:11,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-26 19:51:11,500 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:11,500 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 19, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:11,500 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:11,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:11,500 INFO L82 PathProgramCache]: Analyzing trace with hash -2019561823, now seen corresponding path program 19 times [2018-10-26 19:51:11,500 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:11,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:11,501 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:11,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:11,501 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:11,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:11,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 570 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:11,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:11,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:11,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:11,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:11,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:11,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:11,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:11,746 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:11,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:11,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:11,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 570 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:11,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:12,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 570 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:12,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:12,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-26 19:51:12,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:12,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-26 19:51:12,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-26 19:51:12,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-26 19:51:12,272 INFO L87 Difference]: Start difference. First operand 90 states and 97 transitions. Second operand 22 states. [2018-10-26 19:51:12,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:12,355 INFO L93 Difference]: Finished difference Result 121 states and 136 transitions. [2018-10-26 19:51:12,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-26 19:51:12,358 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 89 [2018-10-26 19:51:12,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:12,358 INFO L225 Difference]: With dead ends: 121 [2018-10-26 19:51:12,358 INFO L226 Difference]: Without dead ends: 93 [2018-10-26 19:51:12,359 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-26 19:51:12,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-26 19:51:12,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-10-26 19:51:12,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-26 19:51:12,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 100 transitions. [2018-10-26 19:51:12,364 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 100 transitions. Word has length 89 [2018-10-26 19:51:12,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:12,365 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 100 transitions. [2018-10-26 19:51:12,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-26 19:51:12,365 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 100 transitions. [2018-10-26 19:51:12,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-26 19:51:12,366 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:12,366 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 20, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:12,366 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:12,366 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:12,366 INFO L82 PathProgramCache]: Analyzing trace with hash -662260772, now seen corresponding path program 20 times [2018-10-26 19:51:12,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:12,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:12,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:12,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:12,367 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:12,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:12,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 420 proven. 630 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:51:12,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:12,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:12,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:12,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:12,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:12,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:12,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:12,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:12,599 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-26 19:51:12,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:12,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:12,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 460 proven. 77 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-26 19:51:12,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:12,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 460 proven. 77 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-26 19:51:12,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:12,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10, 10] total 39 [2018-10-26 19:51:12,914 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:12,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-26 19:51:12,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-26 19:51:12,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-26 19:51:12,915 INFO L87 Difference]: Start difference. First operand 93 states and 100 transitions. Second operand 31 states. [2018-10-26 19:51:13,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:13,106 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2018-10-26 19:51:13,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-26 19:51:13,107 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 92 [2018-10-26 19:51:13,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:13,108 INFO L225 Difference]: With dead ends: 128 [2018-10-26 19:51:13,108 INFO L226 Difference]: Without dead ends: 100 [2018-10-26 19:51:13,109 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-26 19:51:13,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-26 19:51:13,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-26 19:51:13,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-26 19:51:13,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 107 transitions. [2018-10-26 19:51:13,113 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 107 transitions. Word has length 92 [2018-10-26 19:51:13,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:13,116 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 107 transitions. [2018-10-26 19:51:13,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-26 19:51:13,116 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 107 transitions. [2018-10-26 19:51:13,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-26 19:51:13,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:13,117 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 21, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:13,117 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:13,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:13,117 INFO L82 PathProgramCache]: Analyzing trace with hash 976837754, now seen corresponding path program 21 times [2018-10-26 19:51:13,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:13,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:13,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:13,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:13,118 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:13,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:13,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 506 proven. 693 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:13,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:13,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:13,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:13,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:13,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:13,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:13,331 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:13,331 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:13,346 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:13,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:13,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:13,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 506 proven. 693 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:13,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:13,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 506 proven. 693 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:13,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:13,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-26 19:51:13,853 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:13,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-26 19:51:13,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-26 19:51:13,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-26 19:51:13,854 INFO L87 Difference]: Start difference. First operand 99 states and 107 transitions. Second operand 24 states. [2018-10-26 19:51:13,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:13,907 INFO L93 Difference]: Finished difference Result 133 states and 150 transitions. [2018-10-26 19:51:13,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-26 19:51:13,908 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 98 [2018-10-26 19:51:13,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:13,909 INFO L225 Difference]: With dead ends: 133 [2018-10-26 19:51:13,909 INFO L226 Difference]: Without dead ends: 102 [2018-10-26 19:51:13,910 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-26 19:51:13,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-26 19:51:13,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-10-26 19:51:13,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-26 19:51:13,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-26 19:51:13,913 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 98 [2018-10-26 19:51:13,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:13,915 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-26 19:51:13,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-26 19:51:13,915 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-26 19:51:13,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-26 19:51:13,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:13,916 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 22, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:13,916 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:13,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:13,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1561151903, now seen corresponding path program 22 times [2018-10-26 19:51:13,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:13,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:13,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:13,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:13,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:13,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:14,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 529 proven. 759 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:14,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:14,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:14,775 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:14,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:14,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:14,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:14,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:14,784 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:14,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:14,800 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:14,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 529 proven. 759 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:14,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 529 proven. 759 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:15,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:15,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-26 19:51:15,321 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:15,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-26 19:51:15,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-26 19:51:15,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-26 19:51:15,322 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 25 states. [2018-10-26 19:51:15,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:15,369 INFO L93 Difference]: Finished difference Result 136 states and 153 transitions. [2018-10-26 19:51:15,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-26 19:51:15,370 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 101 [2018-10-26 19:51:15,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:15,371 INFO L225 Difference]: With dead ends: 136 [2018-10-26 19:51:15,371 INFO L226 Difference]: Without dead ends: 105 [2018-10-26 19:51:15,372 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-26 19:51:15,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-26 19:51:15,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-26 19:51:15,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-26 19:51:15,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2018-10-26 19:51:15,376 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 101 [2018-10-26 19:51:15,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:15,377 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2018-10-26 19:51:15,377 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-26 19:51:15,377 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2018-10-26 19:51:15,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-26 19:51:15,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:15,377 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:15,378 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:15,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:15,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1361514074, now seen corresponding path program 23 times [2018-10-26 19:51:15,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:15,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:15,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:15,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:15,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:15,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:15,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 552 proven. 828 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:51:15,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:15,618 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:15,618 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:15,618 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:15,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:15,618 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:15,630 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:15,630 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:15,649 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-26 19:51:15,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:15,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:15,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 598 proven. 100 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-10-26 19:51:15,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:16,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 598 proven. 100 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-10-26 19:51:16,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:16,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11, 11] total 44 [2018-10-26 19:51:16,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:16,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-26 19:51:16,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-26 19:51:16,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 19:51:16,031 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand 35 states. [2018-10-26 19:51:16,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:16,156 INFO L93 Difference]: Finished difference Result 143 states and 163 transitions. [2018-10-26 19:51:16,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-26 19:51:16,157 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 104 [2018-10-26 19:51:16,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:16,158 INFO L225 Difference]: With dead ends: 143 [2018-10-26 19:51:16,158 INFO L226 Difference]: Without dead ends: 112 [2018-10-26 19:51:16,159 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 19:51:16,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-26 19:51:16,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-26 19:51:16,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-26 19:51:16,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 120 transitions. [2018-10-26 19:51:16,165 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 120 transitions. Word has length 104 [2018-10-26 19:51:16,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:16,165 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 120 transitions. [2018-10-26 19:51:16,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-26 19:51:16,165 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 120 transitions. [2018-10-26 19:51:16,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-26 19:51:16,166 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:16,166 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 24, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:16,166 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:16,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:16,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1687251132, now seen corresponding path program 24 times [2018-10-26 19:51:16,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:16,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:16,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:16,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:16,167 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:16,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:16,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 650 proven. 900 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:16,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:16,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:16,537 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:16,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:16,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:16,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:16,545 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:16,545 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:16,571 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:16,571 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:16,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:16,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 650 proven. 900 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:16,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:17,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 650 proven. 900 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:17,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:17,190 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-26 19:51:17,190 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:17,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-26 19:51:17,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-26 19:51:17,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:17,192 INFO L87 Difference]: Start difference. First operand 111 states and 120 transitions. Second operand 27 states. [2018-10-26 19:51:17,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:17,260 INFO L93 Difference]: Finished difference Result 148 states and 167 transitions. [2018-10-26 19:51:17,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-26 19:51:17,261 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 110 [2018-10-26 19:51:17,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:17,262 INFO L225 Difference]: With dead ends: 148 [2018-10-26 19:51:17,262 INFO L226 Difference]: Without dead ends: 114 [2018-10-26 19:51:17,263 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:17,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-26 19:51:17,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-10-26 19:51:17,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-26 19:51:17,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 123 transitions. [2018-10-26 19:51:17,267 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 123 transitions. Word has length 110 [2018-10-26 19:51:17,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:17,267 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 123 transitions. [2018-10-26 19:51:17,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-26 19:51:17,268 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 123 transitions. [2018-10-26 19:51:17,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-26 19:51:17,268 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:17,268 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 25, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:17,268 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:17,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:17,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1462122911, now seen corresponding path program 25 times [2018-10-26 19:51:17,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:17,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:17,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:17,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:17,270 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:17,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 676 proven. 975 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:17,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:17,676 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:17,676 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:17,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:17,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:17,676 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/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 [2018-10-26 19:51:17,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:17,684 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:17,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:17,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:17,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 676 proven. 975 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:17,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:18,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 676 proven. 975 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:18,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:18,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2018-10-26 19:51:18,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:18,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-26 19:51:18,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-26 19:51:18,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:18,651 INFO L87 Difference]: Start difference. First operand 114 states and 123 transitions. Second operand 28 states. [2018-10-26 19:51:18,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:18,810 INFO L93 Difference]: Finished difference Result 151 states and 170 transitions. [2018-10-26 19:51:18,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-26 19:51:18,811 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 113 [2018-10-26 19:51:18,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:18,812 INFO L225 Difference]: With dead ends: 151 [2018-10-26 19:51:18,812 INFO L226 Difference]: Without dead ends: 117 [2018-10-26 19:51:18,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 201 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:18,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-26 19:51:18,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-26 19:51:18,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-26 19:51:18,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 126 transitions. [2018-10-26 19:51:18,817 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 126 transitions. Word has length 113 [2018-10-26 19:51:18,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:18,820 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 126 transitions. [2018-10-26 19:51:18,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-26 19:51:18,821 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 126 transitions. [2018-10-26 19:51:18,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-26 19:51:18,821 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:18,821 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 26, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:18,822 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:18,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:18,822 INFO L82 PathProgramCache]: Analyzing trace with hash -903656804, now seen corresponding path program 26 times [2018-10-26 19:51:18,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:18,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:18,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:18,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:18,823 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:18,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:19,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 702 proven. 1053 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:51:19,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:19,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:19,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:19,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:19,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:19,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:19,389 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:19,389 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:19,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-26 19:51:19,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:19,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:19,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 754 proven. 126 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-26 19:51:19,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:19,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 754 proven. 126 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-26 19:51:19,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:19,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 12, 12] total 49 [2018-10-26 19:51:19,904 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:19,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-26 19:51:19,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-26 19:51:19,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-26 19:51:19,905 INFO L87 Difference]: Start difference. First operand 117 states and 126 transitions. Second operand 39 states. [2018-10-26 19:51:20,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:20,083 INFO L93 Difference]: Finished difference Result 158 states and 180 transitions. [2018-10-26 19:51:20,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-26 19:51:20,084 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 116 [2018-10-26 19:51:20,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:20,085 INFO L225 Difference]: With dead ends: 158 [2018-10-26 19:51:20,085 INFO L226 Difference]: Without dead ends: 124 [2018-10-26 19:51:20,085 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-26 19:51:20,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-26 19:51:20,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-26 19:51:20,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-26 19:51:20,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 133 transitions. [2018-10-26 19:51:20,092 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 133 transitions. Word has length 116 [2018-10-26 19:51:20,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:20,092 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 133 transitions. [2018-10-26 19:51:20,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-26 19:51:20,092 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 133 transitions. [2018-10-26 19:51:20,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-26 19:51:20,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:20,093 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 27, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:20,093 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:20,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:20,093 INFO L82 PathProgramCache]: Analyzing trace with hash 482069690, now seen corresponding path program 27 times [2018-10-26 19:51:20,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:20,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:20,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:20,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:20,094 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:20,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:20,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 812 proven. 1134 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:20,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:20,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:20,616 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:20,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:20,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:20,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:20,627 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:20,627 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:20,644 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:20,645 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:20,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:20,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 812 proven. 1134 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:20,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:21,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 812 proven. 1134 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:21,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:21,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2018-10-26 19:51:21,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:21,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-26 19:51:21,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-26 19:51:21,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:21,271 INFO L87 Difference]: Start difference. First operand 123 states and 133 transitions. Second operand 30 states. [2018-10-26 19:51:21,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:21,371 INFO L93 Difference]: Finished difference Result 163 states and 184 transitions. [2018-10-26 19:51:21,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-26 19:51:21,372 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 122 [2018-10-26 19:51:21,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:21,372 INFO L225 Difference]: With dead ends: 163 [2018-10-26 19:51:21,372 INFO L226 Difference]: Without dead ends: 126 [2018-10-26 19:51:21,373 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 217 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:21,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-26 19:51:21,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-26 19:51:21,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-26 19:51:21,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2018-10-26 19:51:21,380 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 122 [2018-10-26 19:51:21,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:21,380 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2018-10-26 19:51:21,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-26 19:51:21,380 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2018-10-26 19:51:21,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-26 19:51:21,380 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:21,380 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 28, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:21,381 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:21,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:21,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1999381793, now seen corresponding path program 28 times [2018-10-26 19:51:21,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:21,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:21,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:21,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:21,382 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 1218 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:22,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:22,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:22,408 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:22,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:22,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:22,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:22,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:22,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:22,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:22,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:22,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 1218 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:22,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:23,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 1218 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:23,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:23,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 52 [2018-10-26 19:51:23,535 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:23,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-26 19:51:23,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-26 19:51:23,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:23,536 INFO L87 Difference]: Start difference. First operand 126 states and 136 transitions. Second operand 31 states. [2018-10-26 19:51:23,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:23,652 INFO L93 Difference]: Finished difference Result 166 states and 187 transitions. [2018-10-26 19:51:23,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-26 19:51:23,653 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 125 [2018-10-26 19:51:23,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:23,653 INFO L225 Difference]: With dead ends: 166 [2018-10-26 19:51:23,653 INFO L226 Difference]: Without dead ends: 129 [2018-10-26 19:51:23,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 222 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:23,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-26 19:51:23,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-26 19:51:23,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-26 19:51:23,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 139 transitions. [2018-10-26 19:51:23,660 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 139 transitions. Word has length 125 [2018-10-26 19:51:23,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:23,660 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 139 transitions. [2018-10-26 19:51:23,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-26 19:51:23,660 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 139 transitions. [2018-10-26 19:51:23,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-26 19:51:23,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:23,661 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 29, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:23,661 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:23,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:23,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1943413094, now seen corresponding path program 29 times [2018-10-26 19:51:23,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:23,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:23,662 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:23,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:23,662 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:24,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 870 proven. 1305 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:51:24,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:24,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:24,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:24,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:24,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:24,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:24,106 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:24,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:24,124 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-26 19:51:24,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:24,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:24,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 928 proven. 155 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-26 19:51:24,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:24,708 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 928 proven. 155 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-26 19:51:24,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:24,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 13, 13] total 54 [2018-10-26 19:51:24,726 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:24,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-26 19:51:24,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-26 19:51:24,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-26 19:51:24,727 INFO L87 Difference]: Start difference. First operand 129 states and 139 transitions. Second operand 43 states. [2018-10-26 19:51:24,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:24,897 INFO L93 Difference]: Finished difference Result 173 states and 197 transitions. [2018-10-26 19:51:24,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-26 19:51:24,898 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 128 [2018-10-26 19:51:24,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:24,899 INFO L225 Difference]: With dead ends: 173 [2018-10-26 19:51:24,899 INFO L226 Difference]: Without dead ends: 136 [2018-10-26 19:51:24,900 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-26 19:51:24,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-26 19:51:24,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-26 19:51:24,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-26 19:51:24,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 146 transitions. [2018-10-26 19:51:24,907 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 146 transitions. Word has length 128 [2018-10-26 19:51:24,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:24,907 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 146 transitions. [2018-10-26 19:51:24,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-26 19:51:24,907 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 146 transitions. [2018-10-26 19:51:24,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-26 19:51:24,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:24,908 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 30, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:24,908 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:24,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:24,908 INFO L82 PathProgramCache]: Analyzing trace with hash -339038340, now seen corresponding path program 30 times [2018-10-26 19:51:24,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:24,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:24,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:24,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:24,914 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:24,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:25,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 992 proven. 1395 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:25,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:25,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:25,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:25,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:25,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:25,529 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:25,537 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:25,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:25,564 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:25,564 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:25,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:25,580 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 992 proven. 1395 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:25,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:26,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 992 proven. 1395 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:26,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:26,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2018-10-26 19:51:26,222 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:26,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-26 19:51:26,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-26 19:51:26,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:26,223 INFO L87 Difference]: Start difference. First operand 135 states and 146 transitions. Second operand 33 states. [2018-10-26 19:51:26,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:26,759 INFO L93 Difference]: Finished difference Result 178 states and 201 transitions. [2018-10-26 19:51:26,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-26 19:51:26,760 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 134 [2018-10-26 19:51:26,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:26,761 INFO L225 Difference]: With dead ends: 178 [2018-10-26 19:51:26,761 INFO L226 Difference]: Without dead ends: 138 [2018-10-26 19:51:26,761 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 238 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:26,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-26 19:51:26,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-10-26 19:51:26,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-26 19:51:26,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 149 transitions. [2018-10-26 19:51:26,772 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 149 transitions. Word has length 134 [2018-10-26 19:51:26,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:26,772 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 149 transitions. [2018-10-26 19:51:26,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-26 19:51:26,772 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 149 transitions. [2018-10-26 19:51:26,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-26 19:51:26,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:26,776 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 31, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:26,777 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:26,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:26,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1758613983, now seen corresponding path program 31 times [2018-10-26 19:51:26,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:26,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:26,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:26,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:26,778 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:26,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:28,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 1024 proven. 1488 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:28,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:28,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:28,131 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:28,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:28,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:28,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:28,140 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:28,140 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:28,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:28,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:28,190 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 1024 proven. 1488 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:28,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:28,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 1024 proven. 1488 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:28,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:28,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2018-10-26 19:51:28,904 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:28,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-26 19:51:28,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-26 19:51:28,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:28,905 INFO L87 Difference]: Start difference. First operand 138 states and 149 transitions. Second operand 34 states. [2018-10-26 19:51:28,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:28,982 INFO L93 Difference]: Finished difference Result 181 states and 204 transitions. [2018-10-26 19:51:28,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-26 19:51:28,983 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 137 [2018-10-26 19:51:28,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:28,984 INFO L225 Difference]: With dead ends: 181 [2018-10-26 19:51:28,984 INFO L226 Difference]: Without dead ends: 141 [2018-10-26 19:51:28,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 243 SyntacticMatches, 14 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:28,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-26 19:51:28,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2018-10-26 19:51:28,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-26 19:51:28,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-26 19:51:28,991 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 137 [2018-10-26 19:51:28,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:28,991 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-26 19:51:28,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-26 19:51:28,992 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-26 19:51:28,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-26 19:51:28,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:28,992 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 32, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:28,992 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:28,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:28,993 INFO L82 PathProgramCache]: Analyzing trace with hash 206369116, now seen corresponding path program 32 times [2018-10-26 19:51:28,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:28,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:28,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:28,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:28,994 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:29,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:29,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 1056 proven. 1584 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:51:29,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:29,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:29,784 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:29,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:29,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:29,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-26 19:51:29,804 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:29,804 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:29,904 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-26 19:51:29,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:29,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:30,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 1120 proven. 187 refuted. 0 times theorem prover too weak. 1488 trivial. 0 not checked. [2018-10-26 19:51:30,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:30,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 1120 proven. 187 refuted. 0 times theorem prover too weak. 1488 trivial. 0 not checked. [2018-10-26 19:51:30,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:30,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14, 14] total 59 [2018-10-26 19:51:30,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:30,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-26 19:51:30,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-26 19:51:30,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-26 19:51:30,687 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 47 states. [2018-10-26 19:51:30,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:30,833 INFO L93 Difference]: Finished difference Result 188 states and 214 transitions. [2018-10-26 19:51:30,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-26 19:51:30,834 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 140 [2018-10-26 19:51:30,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:30,835 INFO L225 Difference]: With dead ends: 188 [2018-10-26 19:51:30,835 INFO L226 Difference]: Without dead ends: 148 [2018-10-26 19:51:30,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-26 19:51:30,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-26 19:51:30,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-26 19:51:30,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-26 19:51:30,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 159 transitions. [2018-10-26 19:51:30,843 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 159 transitions. Word has length 140 [2018-10-26 19:51:30,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:30,843 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 159 transitions. [2018-10-26 19:51:30,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-26 19:51:30,843 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 159 transitions. [2018-10-26 19:51:30,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-26 19:51:30,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:30,844 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 33, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:30,844 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:30,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:30,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1341510406, now seen corresponding path program 33 times [2018-10-26 19:51:30,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:30,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:30,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:30,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:30,845 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:30,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 1190 proven. 1683 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:31,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:31,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:31,309 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:31,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:31,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:31,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-26 19:51:31,328 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:31,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:31,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:31,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:31,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:31,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 1190 proven. 1683 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:31,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:32,100 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 1190 proven. 1683 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:32,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:32,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 52 [2018-10-26 19:51:32,118 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:32,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-26 19:51:32,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-26 19:51:32,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:32,119 INFO L87 Difference]: Start difference. First operand 147 states and 159 transitions. Second operand 36 states. [2018-10-26 19:51:32,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:32,648 INFO L93 Difference]: Finished difference Result 193 states and 218 transitions. [2018-10-26 19:51:32,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-26 19:51:32,649 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 146 [2018-10-26 19:51:32,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:32,650 INFO L225 Difference]: With dead ends: 193 [2018-10-26 19:51:32,650 INFO L226 Difference]: Without dead ends: 150 [2018-10-26 19:51:32,651 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 259 SyntacticMatches, 18 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:32,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-26 19:51:32,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2018-10-26 19:51:32,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-26 19:51:32,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 162 transitions. [2018-10-26 19:51:32,657 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 162 transitions. Word has length 146 [2018-10-26 19:51:32,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:32,658 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 162 transitions. [2018-10-26 19:51:32,658 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-26 19:51:32,658 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 162 transitions. [2018-10-26 19:51:32,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-26 19:51:32,658 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:32,658 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 34, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:32,658 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:32,659 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:32,659 INFO L82 PathProgramCache]: Analyzing trace with hash 324230175, now seen corresponding path program 34 times [2018-10-26 19:51:32,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:32,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:32,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:32,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:32,659 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:32,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:33,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 1225 proven. 1785 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:33,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:33,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:33,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:33,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:33,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:33,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:33,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:33,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:33,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:33,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:33,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 1225 proven. 1785 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:33,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:34,009 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 1225 proven. 1785 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:34,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:34,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 52 [2018-10-26 19:51:34,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:34,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-26 19:51:34,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-26 19:51:34,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:34,026 INFO L87 Difference]: Start difference. First operand 150 states and 162 transitions. Second operand 37 states. [2018-10-26 19:51:34,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:34,186 INFO L93 Difference]: Finished difference Result 196 states and 221 transitions. [2018-10-26 19:51:34,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-26 19:51:34,187 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 149 [2018-10-26 19:51:34,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:34,188 INFO L225 Difference]: With dead ends: 196 [2018-10-26 19:51:34,188 INFO L226 Difference]: Without dead ends: 153 [2018-10-26 19:51:34,188 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 264 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:34,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-10-26 19:51:34,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2018-10-26 19:51:34,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-26 19:51:34,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 165 transitions. [2018-10-26 19:51:34,194 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 165 transitions. Word has length 149 [2018-10-26 19:51:34,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:34,194 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 165 transitions. [2018-10-26 19:51:34,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-26 19:51:34,195 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 165 transitions. [2018-10-26 19:51:34,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-26 19:51:34,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:34,195 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 35, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:34,195 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:34,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:34,196 INFO L82 PathProgramCache]: Analyzing trace with hash 349740762, now seen corresponding path program 35 times [2018-10-26 19:51:34,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:34,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:34,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:34,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:34,197 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:34,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:34,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 1260 proven. 1890 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:51:34,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:34,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:34,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:34,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:34,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:34,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:34,694 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:34,694 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:34,982 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-26 19:51:34,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:34,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:35,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 1330 proven. 222 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-10-26 19:51:35,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 1330 proven. 222 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-10-26 19:51:35,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:35,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 15, 15] total 64 [2018-10-26 19:51:35,782 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:35,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-26 19:51:35,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-26 19:51:35,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-26 19:51:35,784 INFO L87 Difference]: Start difference. First operand 153 states and 165 transitions. Second operand 51 states. [2018-10-26 19:51:35,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:35,917 INFO L93 Difference]: Finished difference Result 203 states and 231 transitions. [2018-10-26 19:51:35,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-26 19:51:35,918 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 152 [2018-10-26 19:51:35,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:35,919 INFO L225 Difference]: With dead ends: 203 [2018-10-26 19:51:35,919 INFO L226 Difference]: Without dead ends: 160 [2018-10-26 19:51:35,920 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-26 19:51:35,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-26 19:51:35,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-26 19:51:35,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-26 19:51:35,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 172 transitions. [2018-10-26 19:51:35,928 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 172 transitions. Word has length 152 [2018-10-26 19:51:35,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:35,928 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 172 transitions. [2018-10-26 19:51:35,928 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-26 19:51:35,928 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 172 transitions. [2018-10-26 19:51:35,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-26 19:51:35,929 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:35,929 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 36, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:35,929 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:35,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:35,929 INFO L82 PathProgramCache]: Analyzing trace with hash -616233412, now seen corresponding path program 36 times [2018-10-26 19:51:35,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:35,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:35,930 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:35,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:35,930 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:35,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:36,535 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1406 proven. 1998 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:36,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:36,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:36,536 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:36,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:36,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:36,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:36,544 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:36,544 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:36,566 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:36,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:36,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:36,594 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1406 proven. 1998 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:36,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:37,295 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1406 proven. 1998 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:37,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:37,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 52 [2018-10-26 19:51:37,311 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:37,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-26 19:51:37,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-26 19:51:37,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:37,312 INFO L87 Difference]: Start difference. First operand 159 states and 172 transitions. Second operand 39 states. [2018-10-26 19:51:37,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:37,388 INFO L93 Difference]: Finished difference Result 208 states and 235 transitions. [2018-10-26 19:51:37,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-26 19:51:37,389 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 158 [2018-10-26 19:51:37,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:37,389 INFO L225 Difference]: With dead ends: 208 [2018-10-26 19:51:37,390 INFO L226 Difference]: Without dead ends: 162 [2018-10-26 19:51:37,390 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 280 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:37,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-26 19:51:37,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-10-26 19:51:37,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-26 19:51:37,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 175 transitions. [2018-10-26 19:51:37,396 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 175 transitions. Word has length 158 [2018-10-26 19:51:37,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:37,396 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 175 transitions. [2018-10-26 19:51:37,396 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-26 19:51:37,396 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 175 transitions. [2018-10-26 19:51:37,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-26 19:51:37,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:37,397 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 37, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:37,397 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:37,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:37,398 INFO L82 PathProgramCache]: Analyzing trace with hash 539993569, now seen corresponding path program 37 times [2018-10-26 19:51:37,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:37,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:37,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:37,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:37,399 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:37,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:38,235 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1444 proven. 2109 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:38,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:38,235 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:38,235 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:38,235 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:38,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:38,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:38,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:38,245 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:38,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:38,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:38,296 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1444 proven. 2109 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:38,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:39,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1444 proven. 2109 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:39,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:39,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-10-26 19:51:39,705 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:39,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-26 19:51:39,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-26 19:51:39,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:39,706 INFO L87 Difference]: Start difference. First operand 162 states and 175 transitions. Second operand 40 states. [2018-10-26 19:51:39,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:39,798 INFO L93 Difference]: Finished difference Result 211 states and 238 transitions. [2018-10-26 19:51:39,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-26 19:51:39,809 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 161 [2018-10-26 19:51:39,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:39,810 INFO L225 Difference]: With dead ends: 211 [2018-10-26 19:51:39,810 INFO L226 Difference]: Without dead ends: 165 [2018-10-26 19:51:39,811 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 285 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:39,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-26 19:51:39,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-26 19:51:39,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-26 19:51:39,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 178 transitions. [2018-10-26 19:51:39,825 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 178 transitions. Word has length 161 [2018-10-26 19:51:39,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:39,825 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 178 transitions. [2018-10-26 19:51:39,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-26 19:51:39,825 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 178 transitions. [2018-10-26 19:51:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-26 19:51:39,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:39,831 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 38, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:39,832 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:39,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:39,832 INFO L82 PathProgramCache]: Analyzing trace with hash 60270620, now seen corresponding path program 38 times [2018-10-26 19:51:39,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:39,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:39,836 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:39,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:39,837 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:39,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:41,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1482 proven. 2223 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:51:41,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:41,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:41,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:41,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:41,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:41,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:41,026 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:41,027 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:41,061 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-26 19:51:41,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:41,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:41,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1558 proven. 260 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-26 19:51:41,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1558 proven. 260 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-26 19:51:41,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:41,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 16, 16] total 69 [2018-10-26 19:51:41,971 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:41,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-26 19:51:41,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-26 19:51:41,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-26 19:51:41,972 INFO L87 Difference]: Start difference. First operand 165 states and 178 transitions. Second operand 55 states. [2018-10-26 19:51:42,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:42,310 INFO L93 Difference]: Finished difference Result 218 states and 248 transitions. [2018-10-26 19:51:42,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-26 19:51:42,311 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 164 [2018-10-26 19:51:42,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:42,312 INFO L225 Difference]: With dead ends: 218 [2018-10-26 19:51:42,312 INFO L226 Difference]: Without dead ends: 172 [2018-10-26 19:51:42,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-26 19:51:42,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-26 19:51:42,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-26 19:51:42,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-26 19:51:42,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 185 transitions. [2018-10-26 19:51:42,320 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 185 transitions. Word has length 164 [2018-10-26 19:51:42,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:42,320 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 185 transitions. [2018-10-26 19:51:42,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-26 19:51:42,320 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 185 transitions. [2018-10-26 19:51:42,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-26 19:51:42,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:42,321 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 39, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:42,321 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:42,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:42,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1374651078, now seen corresponding path program 39 times [2018-10-26 19:51:42,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:42,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:42,326 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:42,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:42,326 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:42,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:42,930 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 1640 proven. 2340 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:42,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:42,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:42,930 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:42,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:42,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:42,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:42,939 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:42,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:42,964 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:42,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:42,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:42,985 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 1640 proven. 2340 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:42,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:43,736 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 1640 proven. 2340 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:43,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:43,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 52 [2018-10-26 19:51:43,755 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:43,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-26 19:51:43,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-26 19:51:43,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:43,756 INFO L87 Difference]: Start difference. First operand 171 states and 185 transitions. Second operand 42 states. [2018-10-26 19:51:43,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:43,867 INFO L93 Difference]: Finished difference Result 223 states and 252 transitions. [2018-10-26 19:51:43,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-26 19:51:43,868 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 170 [2018-10-26 19:51:43,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:43,869 INFO L225 Difference]: With dead ends: 223 [2018-10-26 19:51:43,869 INFO L226 Difference]: Without dead ends: 174 [2018-10-26 19:51:43,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 301 SyntacticMatches, 30 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:43,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-26 19:51:43,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-10-26 19:51:43,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-26 19:51:43,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 188 transitions. [2018-10-26 19:51:43,877 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 188 transitions. Word has length 170 [2018-10-26 19:51:43,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:43,877 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 188 transitions. [2018-10-26 19:51:43,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-26 19:51:43,877 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 188 transitions. [2018-10-26 19:51:43,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-26 19:51:43,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:43,878 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 40, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:43,878 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:43,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:43,878 INFO L82 PathProgramCache]: Analyzing trace with hash -8925857, now seen corresponding path program 40 times [2018-10-26 19:51:43,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:43,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:43,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:43,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:43,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:43,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:45,220 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 1681 proven. 2460 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:45,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:45,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:45,220 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:45,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:45,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:45,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:45,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:45,230 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:45,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:45,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 1681 proven. 2460 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:45,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:46,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 1681 proven. 2460 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:46,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:46,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 52 [2018-10-26 19:51:46,254 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:46,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-26 19:51:46,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-26 19:51:46,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:46,255 INFO L87 Difference]: Start difference. First operand 174 states and 188 transitions. Second operand 43 states. [2018-10-26 19:51:46,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:46,336 INFO L93 Difference]: Finished difference Result 226 states and 255 transitions. [2018-10-26 19:51:46,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-26 19:51:46,337 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 173 [2018-10-26 19:51:46,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:46,338 INFO L225 Difference]: With dead ends: 226 [2018-10-26 19:51:46,338 INFO L226 Difference]: Without dead ends: 177 [2018-10-26 19:51:46,339 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 306 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:46,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-26 19:51:46,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-26 19:51:46,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-26 19:51:46,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 191 transitions. [2018-10-26 19:51:46,345 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 191 transitions. Word has length 173 [2018-10-26 19:51:46,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:46,345 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 191 transitions. [2018-10-26 19:51:46,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-26 19:51:46,348 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 191 transitions. [2018-10-26 19:51:46,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-26 19:51:46,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:46,349 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 41, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:46,349 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:46,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:46,349 INFO L82 PathProgramCache]: Analyzing trace with hash 85937946, now seen corresponding path program 41 times [2018-10-26 19:51:46,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:46,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:46,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:46,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:46,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:46,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:46,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 1722 proven. 2583 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:51:46,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:46,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:46,983 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:46,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:46,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:46,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:46,993 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:46,993 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:47,017 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-26 19:51:47,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:47,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:47,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 1804 proven. 301 refuted. 0 times theorem prover too weak. 2460 trivial. 0 not checked. [2018-10-26 19:51:47,456 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:48,055 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 1804 proven. 301 refuted. 0 times theorem prover too weak. 2460 trivial. 0 not checked. [2018-10-26 19:51:48,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:48,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 17, 17] total 74 [2018-10-26 19:51:48,073 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:48,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-26 19:51:48,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-26 19:51:48,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-26 19:51:48,074 INFO L87 Difference]: Start difference. First operand 177 states and 191 transitions. Second operand 59 states. [2018-10-26 19:51:48,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:48,278 INFO L93 Difference]: Finished difference Result 233 states and 265 transitions. [2018-10-26 19:51:48,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-26 19:51:48,280 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 176 [2018-10-26 19:51:48,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:48,281 INFO L225 Difference]: With dead ends: 233 [2018-10-26 19:51:48,281 INFO L226 Difference]: Without dead ends: 184 [2018-10-26 19:51:48,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-26 19:51:48,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-26 19:51:48,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-26 19:51:48,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-26 19:51:48,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 198 transitions. [2018-10-26 19:51:48,289 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 198 transitions. Word has length 176 [2018-10-26 19:51:48,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:48,289 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 198 transitions. [2018-10-26 19:51:48,289 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-26 19:51:48,289 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 198 transitions. [2018-10-26 19:51:48,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-26 19:51:48,290 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:48,290 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 42, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:48,291 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:48,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:48,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1735103236, now seen corresponding path program 42 times [2018-10-26 19:51:48,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:48,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:48,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:48,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:48,292 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:48,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:48,964 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 1892 proven. 2709 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:48,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:48,965 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:48,965 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:48,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:48,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:48,965 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:48,974 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:48,975 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:49,001 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:49,001 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:49,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:49,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 1892 proven. 2709 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:49,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:49,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 1892 proven. 2709 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:49,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:49,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 52 [2018-10-26 19:51:49,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:49,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-26 19:51:49,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-26 19:51:49,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:49,960 INFO L87 Difference]: Start difference. First operand 183 states and 198 transitions. Second operand 45 states. [2018-10-26 19:51:50,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:50,076 INFO L93 Difference]: Finished difference Result 238 states and 269 transitions. [2018-10-26 19:51:50,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-26 19:51:50,078 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 182 [2018-10-26 19:51:50,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:50,079 INFO L225 Difference]: With dead ends: 238 [2018-10-26 19:51:50,079 INFO L226 Difference]: Without dead ends: 186 [2018-10-26 19:51:50,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 322 SyntacticMatches, 36 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:50,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-26 19:51:50,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2018-10-26 19:51:50,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-26 19:51:50,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 201 transitions. [2018-10-26 19:51:50,088 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 201 transitions. Word has length 182 [2018-10-26 19:51:50,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:50,088 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 201 transitions. [2018-10-26 19:51:50,088 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-26 19:51:50,088 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 201 transitions. [2018-10-26 19:51:50,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-26 19:51:50,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:50,089 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 43, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:50,089 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:50,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:50,090 INFO L82 PathProgramCache]: Analyzing trace with hash 1920183713, now seen corresponding path program 43 times [2018-10-26 19:51:50,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:50,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:50,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:50,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:50,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:50,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:51,187 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 1936 proven. 2838 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:51,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:51,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:51,187 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:51,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:51,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:51,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:51,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:51,196 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:51:51,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:51,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:51,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 1936 proven. 2838 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:51,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:52,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 1936 proven. 2838 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:52,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:52,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 52 [2018-10-26 19:51:52,071 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:52,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-26 19:51:52,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-26 19:51:52,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:52,072 INFO L87 Difference]: Start difference. First operand 186 states and 201 transitions. Second operand 46 states. [2018-10-26 19:51:52,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:52,184 INFO L93 Difference]: Finished difference Result 241 states and 272 transitions. [2018-10-26 19:51:52,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-26 19:51:52,198 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 185 [2018-10-26 19:51:52,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:52,199 INFO L225 Difference]: With dead ends: 241 [2018-10-26 19:51:52,199 INFO L226 Difference]: Without dead ends: 189 [2018-10-26 19:51:52,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 327 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:52,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-26 19:51:52,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-26 19:51:52,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-26 19:51:52,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 204 transitions. [2018-10-26 19:51:52,206 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 204 transitions. Word has length 185 [2018-10-26 19:51:52,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:52,206 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 204 transitions. [2018-10-26 19:51:52,206 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-26 19:51:52,207 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 204 transitions. [2018-10-26 19:51:52,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-26 19:51:52,207 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:52,207 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 44, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:52,208 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:52,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:52,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1972858588, now seen corresponding path program 44 times [2018-10-26 19:51:52,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:52,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:52,209 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:51:52,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:52,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:52,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:55,032 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 1980 proven. 2970 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:51:55,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:55,032 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:55,032 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:55,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:55,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:55,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:55,042 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:51:55,042 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:51:55,067 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-26 19:51:55,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:55,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:55,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 2068 proven. 345 refuted. 0 times theorem prover too weak. 2838 trivial. 0 not checked. [2018-10-26 19:51:55,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:56,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 2068 proven. 345 refuted. 0 times theorem prover too weak. 2838 trivial. 0 not checked. [2018-10-26 19:51:56,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:56,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 18, 18] total 79 [2018-10-26 19:51:56,317 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:56,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-26 19:51:56,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-26 19:51:56,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-26 19:51:56,319 INFO L87 Difference]: Start difference. First operand 189 states and 204 transitions. Second operand 63 states. [2018-10-26 19:51:56,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:56,553 INFO L93 Difference]: Finished difference Result 248 states and 282 transitions. [2018-10-26 19:51:56,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-26 19:51:56,554 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 188 [2018-10-26 19:51:56,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:56,555 INFO L225 Difference]: With dead ends: 248 [2018-10-26 19:51:56,555 INFO L226 Difference]: Without dead ends: 196 [2018-10-26 19:51:56,556 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-26 19:51:56,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-26 19:51:56,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-26 19:51:56,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-26 19:51:56,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 211 transitions. [2018-10-26 19:51:56,566 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 211 transitions. Word has length 188 [2018-10-26 19:51:56,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:56,566 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 211 transitions. [2018-10-26 19:51:56,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-26 19:51:56,566 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 211 transitions. [2018-10-26 19:51:56,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-26 19:51:56,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:56,567 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 45, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:56,567 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:56,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:56,568 INFO L82 PathProgramCache]: Analyzing trace with hash -809845382, now seen corresponding path program 45 times [2018-10-26 19:51:56,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:56,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:56,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:56,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:56,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:56,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:51:57,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2162 proven. 3105 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:51:57,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:57,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:51:57,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:51:57,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:51:57,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:51:57,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:51:57,451 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:51:57,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:51:57,481 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:51:57,481 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:51:57,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:51:57,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2162 proven. 3105 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:51:57,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:51:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2162 proven. 3105 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:51:58,652 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:51:58,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 52 [2018-10-26 19:51:58,653 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:51:58,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-26 19:51:58,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-26 19:51:58,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:58,654 INFO L87 Difference]: Start difference. First operand 195 states and 211 transitions. Second operand 48 states. [2018-10-26 19:51:58,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:51:58,765 INFO L93 Difference]: Finished difference Result 253 states and 286 transitions. [2018-10-26 19:51:58,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-26 19:51:58,766 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 194 [2018-10-26 19:51:58,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:51:58,767 INFO L225 Difference]: With dead ends: 253 [2018-10-26 19:51:58,767 INFO L226 Difference]: Without dead ends: 198 [2018-10-26 19:51:58,767 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 343 SyntacticMatches, 42 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:51:58,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-10-26 19:51:58,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2018-10-26 19:51:58,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-26 19:51:58,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 214 transitions. [2018-10-26 19:51:58,780 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 214 transitions. Word has length 194 [2018-10-26 19:51:58,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:51:58,780 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 214 transitions. [2018-10-26 19:51:58,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-26 19:51:58,780 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 214 transitions. [2018-10-26 19:51:58,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-26 19:51:58,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:51:58,781 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 46, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:51:58,789 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:51:58,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:51:58,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1328361119, now seen corresponding path program 46 times [2018-10-26 19:51:58,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:51:58,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:58,790 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:51:58,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:51:58,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:51:58,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:02,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2209 proven. 3243 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:52:02,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:02,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:02,052 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:02,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:02,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:02,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:02,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:02,061 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:02,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:02,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:02,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2209 proven. 3243 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:52:02,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:02,896 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2209 proven. 3243 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:52:02,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:02,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2018-10-26 19:52:02,914 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:02,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-26 19:52:02,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-26 19:52:02,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:02,915 INFO L87 Difference]: Start difference. First operand 198 states and 214 transitions. Second operand 49 states. [2018-10-26 19:52:03,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:03,101 INFO L93 Difference]: Finished difference Result 256 states and 289 transitions. [2018-10-26 19:52:03,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-26 19:52:03,103 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 197 [2018-10-26 19:52:03,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:03,104 INFO L225 Difference]: With dead ends: 256 [2018-10-26 19:52:03,104 INFO L226 Difference]: Without dead ends: 201 [2018-10-26 19:52:03,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 348 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:03,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-10-26 19:52:03,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2018-10-26 19:52:03,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-26 19:52:03,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 217 transitions. [2018-10-26 19:52:03,112 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 217 transitions. Word has length 197 [2018-10-26 19:52:03,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:03,112 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 217 transitions. [2018-10-26 19:52:03,112 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-26 19:52:03,112 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 217 transitions. [2018-10-26 19:52:03,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-26 19:52:03,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:03,113 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 47, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:03,113 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:03,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:03,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1978265434, now seen corresponding path program 47 times [2018-10-26 19:52:03,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:03,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:03,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:03,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:03,114 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:03,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:04,894 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2256 proven. 3384 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-26 19:52:04,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:04,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:04,895 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:04,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:04,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:04,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:04,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:52:04,906 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:52:04,933 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-26 19:52:04,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:04,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:05,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2350 proven. 392 refuted. 0 times theorem prover too weak. 3243 trivial. 0 not checked. [2018-10-26 19:52:05,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:06,317 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2350 proven. 392 refuted. 0 times theorem prover too weak. 3243 trivial. 0 not checked. [2018-10-26 19:52:06,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:06,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 19, 19] total 84 [2018-10-26 19:52:06,335 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:06,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-26 19:52:06,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-26 19:52:06,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-26 19:52:06,337 INFO L87 Difference]: Start difference. First operand 201 states and 217 transitions. Second operand 67 states. [2018-10-26 19:52:06,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:06,565 INFO L93 Difference]: Finished difference Result 263 states and 299 transitions. [2018-10-26 19:52:06,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-26 19:52:06,566 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 200 [2018-10-26 19:52:06,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:06,567 INFO L225 Difference]: With dead ends: 263 [2018-10-26 19:52:06,567 INFO L226 Difference]: Without dead ends: 208 [2018-10-26 19:52:06,568 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-26 19:52:06,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-26 19:52:06,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-26 19:52:06,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-26 19:52:06,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 224 transitions. [2018-10-26 19:52:06,577 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 224 transitions. Word has length 200 [2018-10-26 19:52:06,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:06,578 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 224 transitions. [2018-10-26 19:52:06,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-26 19:52:06,578 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 224 transitions. [2018-10-26 19:52:06,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-26 19:52:06,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:06,579 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 48, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:06,579 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:06,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:06,579 INFO L82 PathProgramCache]: Analyzing trace with hash 709682108, now seen corresponding path program 48 times [2018-10-26 19:52:06,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:06,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:06,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:06,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:06,580 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:06,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:07,460 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 2450 proven. 3528 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:07,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:07,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:07,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:07,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:07,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:07,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:07,471 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:52:07,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:52:07,502 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:52:07,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:07,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:07,547 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 2450 proven. 3528 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:07,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:08,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 2450 proven. 3528 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:08,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:08,581 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2018-10-26 19:52:08,581 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:08,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-26 19:52:08,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-26 19:52:08,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:08,582 INFO L87 Difference]: Start difference. First operand 207 states and 224 transitions. Second operand 51 states. [2018-10-26 19:52:09,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:09,931 INFO L93 Difference]: Finished difference Result 268 states and 303 transitions. [2018-10-26 19:52:09,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-26 19:52:09,933 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 206 [2018-10-26 19:52:09,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:09,934 INFO L225 Difference]: With dead ends: 268 [2018-10-26 19:52:09,934 INFO L226 Difference]: Without dead ends: 210 [2018-10-26 19:52:09,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 364 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:09,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2018-10-26 19:52:09,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2018-10-26 19:52:09,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-26 19:52:09,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 227 transitions. [2018-10-26 19:52:09,943 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 227 transitions. Word has length 206 [2018-10-26 19:52:09,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:09,943 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 227 transitions. [2018-10-26 19:52:09,943 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-26 19:52:09,944 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 227 transitions. [2018-10-26 19:52:09,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-26 19:52:09,944 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:09,945 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 49, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:09,945 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:09,945 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:09,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1569572193, now seen corresponding path program 49 times [2018-10-26 19:52:09,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:09,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:09,946 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:09,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:09,946 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:09,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 2500 proven. 3675 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:10,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:10,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:10,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:10,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:10,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:10,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:10,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:10,753 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:10,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:10,821 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 2500 proven. 3675 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:10,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 2500 proven. 3675 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-26 19:52:11,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:11,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 52 [2018-10-26 19:52:11,685 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:11,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-26 19:52:11,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-26 19:52:11,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:11,686 INFO L87 Difference]: Start difference. First operand 210 states and 227 transitions. Second operand 52 states. [2018-10-26 19:52:11,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:11,814 INFO L93 Difference]: Finished difference Result 271 states and 306 transitions. [2018-10-26 19:52:11,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-26 19:52:11,815 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 209 [2018-10-26 19:52:11,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:11,816 INFO L225 Difference]: With dead ends: 271 [2018-10-26 19:52:11,816 INFO L226 Difference]: Without dead ends: 213 [2018-10-26 19:52:11,816 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 369 SyntacticMatches, 50 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:11,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2018-10-26 19:52:11,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2018-10-26 19:52:11,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-26 19:52:11,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 230 transitions. [2018-10-26 19:52:11,826 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 230 transitions. Word has length 209 [2018-10-26 19:52:11,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:11,826 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 230 transitions. [2018-10-26 19:52:11,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-26 19:52:11,826 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 230 transitions. [2018-10-26 19:52:11,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-26 19:52:11,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:11,827 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 50, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:11,828 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:11,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:11,828 INFO L82 PathProgramCache]: Analyzing trace with hash -924826212, now seen corresponding path program 50 times [2018-10-26 19:52:11,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:11,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:11,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:11,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:11,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:11,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:12,149 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 2832 proven. 551 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:12,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:12,150 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:12,150 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:12,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:12,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:12,150 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:12,162 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:52:12,162 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:52:12,192 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-26 19:52:12,193 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:12,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:12,224 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 2650 proven. 442 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:12,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 2650 proven. 442 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:12,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:12,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20, 20] total 40 [2018-10-26 19:52:12,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:12,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-26 19:52:12,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-26 19:52:12,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:52:12,581 INFO L87 Difference]: Start difference. First operand 213 states and 230 transitions. Second operand 22 states. [2018-10-26 19:52:12,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:12,643 INFO L93 Difference]: Finished difference Result 228 states and 251 transitions. [2018-10-26 19:52:12,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-26 19:52:12,645 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 212 [2018-10-26 19:52:12,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:12,646 INFO L225 Difference]: With dead ends: 228 [2018-10-26 19:52:12,646 INFO L226 Difference]: Without dead ends: 223 [2018-10-26 19:52:12,646 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 407 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:52:12,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-26 19:52:12,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-26 19:52:12,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-26 19:52:12,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 242 transitions. [2018-10-26 19:52:12,659 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 242 transitions. Word has length 212 [2018-10-26 19:52:12,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:12,660 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 242 transitions. [2018-10-26 19:52:12,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-26 19:52:12,660 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 242 transitions. [2018-10-26 19:52:12,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-26 19:52:12,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:12,661 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 50, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:12,661 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:12,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:12,661 INFO L82 PathProgramCache]: Analyzing trace with hash 890030239, now seen corresponding path program 51 times [2018-10-26 19:52:12,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:12,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:12,672 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:12,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:12,672 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:12,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:12,958 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3264 proven. 737 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:12,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:12,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:12,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:12,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:12,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:12,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:12,970 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:52:12,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:52:13,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:52:13,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:13,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:15,229 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:15,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:17,018 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:17,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:17,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 73, 73] total 102 [2018-10-26 19:52:17,036 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:17,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-26 19:52:17,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-26 19:52:17,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:17,038 INFO L87 Difference]: Start difference. First operand 222 states and 242 transitions. Second operand 75 states. [2018-10-26 19:52:17,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:17,291 INFO L93 Difference]: Finished difference Result 237 states and 263 transitions. [2018-10-26 19:52:17,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-26 19:52:17,293 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 221 [2018-10-26 19:52:17,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:17,294 INFO L225 Difference]: With dead ends: 237 [2018-10-26 19:52:17,294 INFO L226 Difference]: Without dead ends: 232 [2018-10-26 19:52:17,295 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 322 SyntacticMatches, 44 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10292 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:17,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-26 19:52:17,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 231. [2018-10-26 19:52:17,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-10-26 19:52:17,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 254 transitions. [2018-10-26 19:52:17,307 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 254 transitions. Word has length 221 [2018-10-26 19:52:17,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:17,307 INFO L481 AbstractCegarLoop]: Abstraction has 231 states and 254 transitions. [2018-10-26 19:52:17,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-26 19:52:17,307 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 254 transitions. [2018-10-26 19:52:17,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-10-26 19:52:17,308 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:17,309 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 50, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:17,309 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:17,309 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:17,309 INFO L82 PathProgramCache]: Analyzing trace with hash 740292860, now seen corresponding path program 52 times [2018-10-26 19:52:17,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:17,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:17,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:17,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:17,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:17,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:17,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 3696 proven. 950 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:17,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:17,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:17,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:17,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:17,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:17,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:17,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:17,613 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:17,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:17,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:18,940 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:18,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:20,532 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:20,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:20,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 76, 76] total 102 [2018-10-26 19:52:20,550 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:20,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-26 19:52:20,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-26 19:52:20,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:20,552 INFO L87 Difference]: Start difference. First operand 231 states and 254 transitions. Second operand 78 states. [2018-10-26 19:52:20,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:20,847 INFO L93 Difference]: Finished difference Result 246 states and 275 transitions. [2018-10-26 19:52:20,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-10-26 19:52:20,848 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 230 [2018-10-26 19:52:20,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:20,849 INFO L225 Difference]: With dead ends: 246 [2018-10-26 19:52:20,850 INFO L226 Difference]: Without dead ends: 241 [2018-10-26 19:52:20,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 337 SyntacticMatches, 50 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11027 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:20,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-10-26 19:52:20,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 240. [2018-10-26 19:52:20,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-26 19:52:20,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 266 transitions. [2018-10-26 19:52:20,858 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 266 transitions. Word has length 230 [2018-10-26 19:52:20,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:20,858 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 266 transitions. [2018-10-26 19:52:20,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-26 19:52:20,858 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 266 transitions. [2018-10-26 19:52:20,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2018-10-26 19:52:20,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:20,859 INFO L375 BasicCegarLoop]: trace histogram [77, 76, 50, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:20,860 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:20,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:20,860 INFO L82 PathProgramCache]: Analyzing trace with hash -28253889, now seen corresponding path program 53 times [2018-10-26 19:52:20,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:20,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:20,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:20,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:20,861 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:20,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:21,673 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4128 proven. 1190 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:21,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:21,673 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:21,673 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:21,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:21,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:21,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:21,684 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:52:21,684 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:52:21,727 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-26 19:52:21,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:21,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:21,761 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4000 proven. 1027 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:21,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:22,372 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4000 proven. 1027 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:22,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:22,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29, 29] total 52 [2018-10-26 19:52:22,391 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:22,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-26 19:52:22,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-26 19:52:22,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:22,392 INFO L87 Difference]: Start difference. First operand 240 states and 266 transitions. Second operand 31 states. [2018-10-26 19:52:22,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:22,484 INFO L93 Difference]: Finished difference Result 255 states and 287 transitions. [2018-10-26 19:52:22,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-26 19:52:22,485 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 239 [2018-10-26 19:52:22,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:22,486 INFO L225 Difference]: With dead ends: 255 [2018-10-26 19:52:22,486 INFO L226 Difference]: Without dead ends: 250 [2018-10-26 19:52:22,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 452 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:22,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-10-26 19:52:22,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 249. [2018-10-26 19:52:22,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-26 19:52:22,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 278 transitions. [2018-10-26 19:52:22,496 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 278 transitions. Word has length 239 [2018-10-26 19:52:22,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:22,497 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 278 transitions. [2018-10-26 19:52:22,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-26 19:52:22,497 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 278 transitions. [2018-10-26 19:52:22,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2018-10-26 19:52:22,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:22,498 INFO L375 BasicCegarLoop]: trace histogram [80, 79, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:22,498 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:22,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:22,499 INFO L82 PathProgramCache]: Analyzing trace with hash 534615132, now seen corresponding path program 54 times [2018-10-26 19:52:22,499 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:22,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:22,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:22,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:22,500 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:22,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:23,281 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 4560 proven. 1457 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:23,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:23,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:23,282 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:23,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:23,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:23,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:23,292 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:52:23,292 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:52:23,327 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:52:23,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:23,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:24,172 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:24,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:25,649 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:25,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:25,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 82, 82] total 102 [2018-10-26 19:52:25,666 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:25,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-26 19:52:25,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-26 19:52:25,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:25,667 INFO L87 Difference]: Start difference. First operand 249 states and 278 transitions. Second operand 84 states. [2018-10-26 19:52:26,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:26,109 INFO L93 Difference]: Finished difference Result 264 states and 299 transitions. [2018-10-26 19:52:26,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-10-26 19:52:26,111 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 248 [2018-10-26 19:52:26,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:26,112 INFO L225 Difference]: With dead ends: 264 [2018-10-26 19:52:26,112 INFO L226 Difference]: Without dead ends: 259 [2018-10-26 19:52:26,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 367 SyntacticMatches, 62 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12497 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:26,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-26 19:52:26,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 258. [2018-10-26 19:52:26,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2018-10-26 19:52:26,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 290 transitions. [2018-10-26 19:52:26,122 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 290 transitions. Word has length 248 [2018-10-26 19:52:26,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:26,122 INFO L481 AbstractCegarLoop]: Abstraction has 258 states and 290 transitions. [2018-10-26 19:52:26,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-26 19:52:26,122 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 290 transitions. [2018-10-26 19:52:26,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2018-10-26 19:52:26,123 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:26,123 INFO L375 BasicCegarLoop]: trace histogram [83, 82, 50, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:26,124 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:26,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:26,124 INFO L82 PathProgramCache]: Analyzing trace with hash 37491167, now seen corresponding path program 55 times [2018-10-26 19:52:26,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:26,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:26,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:26,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:26,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:26,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:26,610 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 4992 proven. 1751 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:26,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:26,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:26,611 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:26,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:26,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:26,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:26,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:26,623 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:26,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:26,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:27,557 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:27,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:29,038 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:29,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:29,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 85, 85] total 102 [2018-10-26 19:52:29,057 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:29,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-26 19:52:29,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-26 19:52:29,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:29,059 INFO L87 Difference]: Start difference. First operand 258 states and 290 transitions. Second operand 87 states. [2018-10-26 19:52:29,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:29,535 INFO L93 Difference]: Finished difference Result 273 states and 311 transitions. [2018-10-26 19:52:29,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-10-26 19:52:29,537 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 257 [2018-10-26 19:52:29,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:29,538 INFO L225 Difference]: With dead ends: 273 [2018-10-26 19:52:29,538 INFO L226 Difference]: Without dead ends: 268 [2018-10-26 19:52:29,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 550 GetRequests, 382 SyntacticMatches, 68 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13232 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:29,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2018-10-26 19:52:29,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 267. [2018-10-26 19:52:29,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-26 19:52:29,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 302 transitions. [2018-10-26 19:52:29,548 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 302 transitions. Word has length 257 [2018-10-26 19:52:29,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:29,548 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 302 transitions. [2018-10-26 19:52:29,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-26 19:52:29,548 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 302 transitions. [2018-10-26 19:52:29,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-26 19:52:29,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:29,550 INFO L375 BasicCegarLoop]: trace histogram [86, 85, 50, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:29,550 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:29,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:29,550 INFO L82 PathProgramCache]: Analyzing trace with hash -949020740, now seen corresponding path program 56 times [2018-10-26 19:52:29,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:29,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:29,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:29,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:29,551 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:29,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 5424 proven. 2072 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:30,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:30,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:30,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:30,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:30,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:30,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:30,149 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:52:30,149 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:52:30,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-26 19:52:30,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:30,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:30,250 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 5350 proven. 1855 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:30,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:30,976 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 5350 proven. 1855 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:30,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:30,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 38, 38] total 52 [2018-10-26 19:52:30,994 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:30,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-26 19:52:30,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-26 19:52:30,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:30,995 INFO L87 Difference]: Start difference. First operand 267 states and 302 transitions. Second operand 40 states. [2018-10-26 19:52:31,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:31,122 INFO L93 Difference]: Finished difference Result 282 states and 323 transitions. [2018-10-26 19:52:31,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-26 19:52:31,123 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 266 [2018-10-26 19:52:31,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:31,124 INFO L225 Difference]: With dead ends: 282 [2018-10-26 19:52:31,125 INFO L226 Difference]: Without dead ends: 277 [2018-10-26 19:52:31,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 497 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:31,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-26 19:52:31,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 276. [2018-10-26 19:52:31,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-10-26 19:52:31,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 314 transitions. [2018-10-26 19:52:31,135 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 314 transitions. Word has length 266 [2018-10-26 19:52:31,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:31,135 INFO L481 AbstractCegarLoop]: Abstraction has 276 states and 314 transitions. [2018-10-26 19:52:31,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-26 19:52:31,135 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 314 transitions. [2018-10-26 19:52:31,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-26 19:52:31,136 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:31,136 INFO L375 BasicCegarLoop]: trace histogram [89, 88, 50, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:31,137 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:31,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:31,137 INFO L82 PathProgramCache]: Analyzing trace with hash 2117622399, now seen corresponding path program 57 times [2018-10-26 19:52:31,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:31,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:31,138 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:31,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:31,138 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:31,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:31,773 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 5856 proven. 2420 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:31,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:31,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:31,773 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:31,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:31,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:31,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:31,785 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:52:31,785 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:52:31,824 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:52:31,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:31,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:32,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:34,388 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:34,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:34,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 91, 91] total 102 [2018-10-26 19:52:34,407 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:34,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-10-26 19:52:34,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-10-26 19:52:34,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:34,409 INFO L87 Difference]: Start difference. First operand 276 states and 314 transitions. Second operand 93 states. [2018-10-26 19:52:34,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:34,963 INFO L93 Difference]: Finished difference Result 291 states and 335 transitions. [2018-10-26 19:52:34,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-10-26 19:52:34,964 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 275 [2018-10-26 19:52:34,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:34,965 INFO L225 Difference]: With dead ends: 291 [2018-10-26 19:52:34,965 INFO L226 Difference]: Without dead ends: 286 [2018-10-26 19:52:34,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 412 SyntacticMatches, 80 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14702 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:34,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2018-10-26 19:52:34,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 285. [2018-10-26 19:52:34,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2018-10-26 19:52:34,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 326 transitions. [2018-10-26 19:52:34,976 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 326 transitions. Word has length 275 [2018-10-26 19:52:34,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:34,976 INFO L481 AbstractCegarLoop]: Abstraction has 285 states and 326 transitions. [2018-10-26 19:52:34,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-10-26 19:52:34,976 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 326 transitions. [2018-10-26 19:52:34,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-26 19:52:34,978 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:34,978 INFO L375 BasicCegarLoop]: trace histogram [92, 91, 50, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:34,978 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:34,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:34,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1554678556, now seen corresponding path program 58 times [2018-10-26 19:52:34,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:34,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:34,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:34,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:34,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:34,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:35,941 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 6288 proven. 2795 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:35,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:35,942 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:35,942 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:35,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:35,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:35,942 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:35,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:35,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:35,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:35,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:36,834 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:36,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:38,380 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:38,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:38,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 94, 94] total 102 [2018-10-26 19:52:38,398 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:38,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-10-26 19:52:38,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-10-26 19:52:38,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:38,400 INFO L87 Difference]: Start difference. First operand 285 states and 326 transitions. Second operand 96 states. [2018-10-26 19:52:39,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:39,019 INFO L93 Difference]: Finished difference Result 300 states and 347 transitions. [2018-10-26 19:52:39,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-10-26 19:52:39,021 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 284 [2018-10-26 19:52:39,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:39,022 INFO L225 Difference]: With dead ends: 300 [2018-10-26 19:52:39,022 INFO L226 Difference]: Without dead ends: 295 [2018-10-26 19:52:39,022 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 427 SyntacticMatches, 86 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15437 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:39,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2018-10-26 19:52:39,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2018-10-26 19:52:39,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2018-10-26 19:52:39,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 338 transitions. [2018-10-26 19:52:39,030 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 338 transitions. Word has length 284 [2018-10-26 19:52:39,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:39,030 INFO L481 AbstractCegarLoop]: Abstraction has 294 states and 338 transitions. [2018-10-26 19:52:39,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-10-26 19:52:39,030 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 338 transitions. [2018-10-26 19:52:39,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2018-10-26 19:52:39,031 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:39,031 INFO L375 BasicCegarLoop]: trace histogram [95, 94, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:39,032 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:39,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:39,032 INFO L82 PathProgramCache]: Analyzing trace with hash -382747873, now seen corresponding path program 59 times [2018-10-26 19:52:39,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:39,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:39,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:39,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:39,033 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:39,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:39,730 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 6720 proven. 3197 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:39,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:39,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:39,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:39,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:39,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:39,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:39,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:52:39,743 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:52:39,827 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-10-26 19:52:39,827 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:39,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:39,865 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 6700 proven. 2926 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:39,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:40,620 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 6700 proven. 2926 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-26 19:52:40,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:40,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 47, 47] total 52 [2018-10-26 19:52:40,637 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:40,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-26 19:52:40,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-26 19:52:40,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:40,638 INFO L87 Difference]: Start difference. First operand 294 states and 338 transitions. Second operand 49 states. [2018-10-26 19:52:40,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:40,838 INFO L93 Difference]: Finished difference Result 309 states and 359 transitions. [2018-10-26 19:52:40,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-26 19:52:40,839 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 293 [2018-10-26 19:52:40,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:40,841 INFO L225 Difference]: With dead ends: 309 [2018-10-26 19:52:40,841 INFO L226 Difference]: Without dead ends: 304 [2018-10-26 19:52:40,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 542 SyntacticMatches, 42 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:40,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2018-10-26 19:52:40,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 303. [2018-10-26 19:52:40,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-10-26 19:52:40,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 350 transitions. [2018-10-26 19:52:40,851 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 350 transitions. Word has length 293 [2018-10-26 19:52:40,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:40,852 INFO L481 AbstractCegarLoop]: Abstraction has 303 states and 350 transitions. [2018-10-26 19:52:40,852 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-26 19:52:40,852 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 350 transitions. [2018-10-26 19:52:40,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2018-10-26 19:52:40,853 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:40,854 INFO L375 BasicCegarLoop]: trace histogram [98, 97, 50, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:40,854 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:40,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:40,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1880762756, now seen corresponding path program 60 times [2018-10-26 19:52:40,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:40,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:40,855 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:40,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:40,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:40,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:41,707 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 7152 proven. 3626 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-26 19:52:41,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:41,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:41,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:41,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:41,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:41,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:41,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:52:41,719 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:52:41,762 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:52:41,762 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:52:41,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:42,664 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:42,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:44,259 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:52:44,276 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:44,276 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 100, 100] total 102 [2018-10-26 19:52:44,276 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:44,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-10-26 19:52:44,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-10-26 19:52:44,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:44,278 INFO L87 Difference]: Start difference. First operand 303 states and 350 transitions. Second operand 102 states. [2018-10-26 19:52:44,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:44,981 INFO L93 Difference]: Finished difference Result 317 states and 369 transitions. [2018-10-26 19:52:44,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-10-26 19:52:44,983 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 302 [2018-10-26 19:52:44,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:44,984 INFO L225 Difference]: With dead ends: 317 [2018-10-26 19:52:44,984 INFO L226 Difference]: Without dead ends: 312 [2018-10-26 19:52:44,985 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 457 SyntacticMatches, 98 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16907 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-26 19:52:44,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-26 19:52:44,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2018-10-26 19:52:44,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-10-26 19:52:44,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 362 transitions. [2018-10-26 19:52:44,994 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 362 transitions. Word has length 302 [2018-10-26 19:52:44,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:44,994 INFO L481 AbstractCegarLoop]: Abstraction has 312 states and 362 transitions. [2018-10-26 19:52:44,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-10-26 19:52:44,994 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 362 transitions. [2018-10-26 19:52:44,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-10-26 19:52:44,996 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:44,996 INFO L375 BasicCegarLoop]: trace histogram [101, 100, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:44,996 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:44,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:44,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1819528257, now seen corresponding path program 61 times [2018-10-26 19:52:44,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:44,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:44,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:52:44,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:44,997 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:45,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:47,003 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-26 19:52:47,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:47,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:52:47,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:52:47,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:52:47,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:52:47,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:52:47,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:47,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:52:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:47,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:52:47,318 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-26 19:52:47,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:52:47,724 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-26 19:52:47,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:52:47,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2018-10-26 19:52:47,740 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:52:47,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-26 19:52:47,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-26 19:52:47,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-10-26 19:52:47,741 INFO L87 Difference]: Start difference. First operand 312 states and 362 transitions. Second operand 55 states. [2018-10-26 19:52:48,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:48,853 INFO L93 Difference]: Finished difference Result 4294 states and 5669 transitions. [2018-10-26 19:52:48,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-26 19:52:48,855 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 311 [2018-10-26 19:52:48,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:48,863 INFO L225 Difference]: With dead ends: 4294 [2018-10-26 19:52:48,863 INFO L226 Difference]: Without dead ends: 4289 [2018-10-26 19:52:48,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 616 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=119, Invalid=3187, Unknown=0, NotChecked=0, Total=3306 [2018-10-26 19:52:48,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4289 states. [2018-10-26 19:52:48,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4289 to 315. [2018-10-26 19:52:48,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-10-26 19:52:48,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 366 transitions. [2018-10-26 19:52:48,935 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 366 transitions. Word has length 311 [2018-10-26 19:52:48,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:48,935 INFO L481 AbstractCegarLoop]: Abstraction has 315 states and 366 transitions. [2018-10-26 19:52:48,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-26 19:52:48,935 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 366 transitions. [2018-10-26 19:52:48,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-26 19:52:48,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:52:48,937 INFO L375 BasicCegarLoop]: trace histogram [102, 101, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:52:48,937 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:52:48,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:52:48,938 INFO L82 PathProgramCache]: Analyzing trace with hash 908591292, now seen corresponding path program 62 times [2018-10-26 19:52:48,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:52:48,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:48,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:52:48,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:52:48,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:52:48,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:52:49,822 INFO L134 CoverageAnalysis]: Checked inductivity of 15352 backedges. 11527 proven. 0 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-26 19:52:49,823 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 19:52:49,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2018-10-26 19:52:49,823 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:52:49,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-26 19:52:49,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-26 19:52:49,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:49,824 INFO L87 Difference]: Start difference. First operand 315 states and 366 transitions. Second operand 52 states. [2018-10-26 19:52:50,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:52:50,055 INFO L93 Difference]: Finished difference Result 464 states and 564 transitions. [2018-10-26 19:52:50,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-26 19:52:50,056 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 314 [2018-10-26 19:52:50,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:52:50,057 INFO L225 Difference]: With dead ends: 464 [2018-10-26 19:52:50,057 INFO L226 Difference]: Without dead ends: 0 [2018-10-26 19:52:50,058 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-26 19:52:50,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-26 19:52:50,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-26 19:52:50,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-26 19:52:50,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-26 19:52:50,058 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 314 [2018-10-26 19:52:50,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:52:50,058 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-26 19:52:50,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-26 19:52:50,059 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-26 19:52:50,059 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-26 19:52:50,075 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-26 19:52:50,840 WARN L179 SmtUtils]: Spent 749.00 ms on a formula simplification. DAG size of input: 1848 DAG size of output: 407 [2018-10-26 19:52:52,821 WARN L179 SmtUtils]: Spent 1.92 s on a formula simplification. DAG size of input: 407 DAG size of output: 357 [2018-10-26 19:52:52,828 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-26 19:52:52,828 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-26 19:52:52,828 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-26 19:52:52,828 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-26 19:52:52,828 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-26 19:52:52,829 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 23) the Hoare annotation is: true [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 23) no Hoare annotation was computed. [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 23) no Hoare annotation was computed. [2018-10-26 19:52:52,829 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 20) no Hoare annotation was computed. [2018-10-26 19:52:52,830 INFO L421 ceAbstractionStarter]: At program point L14-2(lines 13 20) the Hoare annotation is: (or (and (and (<= main_~x~0 99) (<= 99 main_~y~0) (<= main_~y~0 99)) (<= 99 main_~x~0)) (and (and (<= main_~y~0 92) (<= 92 main_~y~0) (<= main_~x~0 92)) (<= 92 main_~x~0)) (and (<= 65 main_~x~0) (and (<= main_~y~0 65) (<= 65 main_~y~0) (<= main_~x~0 65))) (and (and (<= main_~y~0 100) (< 99 main_~y~0)) (<= 100 main_~x~0)) (and (<= 64 main_~x~0) (and (<= main_~x~0 64) (<= 64 main_~y~0) (<= main_~y~0 64))) (and (<= 76 main_~x~0) (and (<= main_~y~0 76) (<= main_~x~0 76) (<= 76 main_~y~0))) (and (<= 87 main_~x~0) (and (<= main_~x~0 87) (<= main_~y~0 87) (<= 87 main_~y~0))) (and (and (<= main_~y~0 78) (<= 78 main_~y~0) (<= main_~x~0 78)) (<= 78 main_~x~0)) (and (<= 72 main_~x~0) (and (<= main_~y~0 72) (<= main_~x~0 72) (<= 72 main_~y~0))) (and (and (<= main_~y~0 69) (<= 69 main_~y~0) (<= main_~x~0 69)) (<= 69 main_~x~0)) (and (<= 60 main_~x~0) (and (<= main_~x~0 60) (<= main_~y~0 60) (<= 60 main_~y~0))) (and (<= 67 main_~x~0) (and (<= main_~y~0 67) (<= main_~x~0 67) (<= 67 main_~y~0))) (and (and (<= main_~y~0 55) (<= 55 main_~y~0) (<= main_~x~0 55)) (<= 55 main_~x~0)) (and (and (<= 73 main_~y~0) (<= main_~x~0 73) (<= main_~y~0 73)) (<= 73 main_~x~0)) (and (<= 66 main_~x~0) (and (<= main_~y~0 66) (<= 66 main_~y~0) (<= main_~x~0 66))) (and (and (<= main_~x~0 70) (<= main_~y~0 70) (<= 70 main_~y~0)) (<= 70 main_~x~0)) (and (and (<= main_~x~0 95) (<= main_~y~0 95) (<= 95 main_~y~0)) (<= 95 main_~x~0)) (and (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= main_~x~0 90)) (<= 90 main_~x~0)) (and (and (<= main_~y~0 59) (<= main_~x~0 59) (<= 59 main_~y~0)) (<= 59 main_~x~0)) (and (<= 85 main_~x~0) (and (<= 85 main_~y~0) (<= main_~x~0 85) (<= main_~y~0 85))) (and (<= 63 main_~x~0) (and (<= main_~y~0 63) (<= main_~x~0 63) (<= 63 main_~y~0))) (and (and (<= main_~y~0 77) (<= main_~x~0 77) (<= 77 main_~y~0)) (<= 77 main_~x~0)) (and (<= 53 main_~x~0) (and (<= main_~y~0 53) (<= main_~x~0 53) (<= 53 main_~y~0))) (and (and (<= main_~x~0 79) (<= main_~y~0 79) (<= 79 main_~y~0)) (<= 79 main_~x~0)) (and (<= 68 main_~x~0) (and (<= 68 main_~y~0) (<= main_~y~0 68) (<= main_~x~0 68))) (and (<= 54 main_~x~0) (and (<= main_~x~0 54) (<= 54 main_~y~0) (<= main_~y~0 54))) (and (<= 51 main_~x~0) (and (<= 51 main_~y~0) (<= main_~x~0 51) (<= main_~y~0 51))) (and (and (<= 56 main_~y~0) (<= main_~x~0 56) (<= main_~y~0 56)) (<= 56 main_~x~0)) (and (<= 61 main_~x~0) (and (<= main_~y~0 61) (<= 61 main_~y~0) (<= main_~x~0 61))) (and (<= 88 main_~x~0) (and (<= main_~x~0 88) (<= main_~y~0 88) (<= 88 main_~y~0))) (and (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and (<= 80 main_~x~0) (and (<= main_~x~0 80) (<= 80 main_~y~0) (<= main_~y~0 80))) (and (<= 94 main_~x~0) (and (<= main_~x~0 94) (<= main_~y~0 94) (<= 94 main_~y~0))) (and (<= 89 main_~x~0) (and (<= 89 main_~y~0) (<= main_~y~0 89) (<= main_~x~0 89))) (and (and (<= 86 main_~y~0) (<= main_~x~0 86) (<= main_~y~0 86)) (<= 86 main_~x~0)) (and (<= 58 main_~x~0) (and (<= main_~x~0 58) (<= main_~y~0 58) (<= 58 main_~y~0))) (and (and (<= main_~x~0 91) (<= 91 main_~y~0) (<= main_~y~0 91)) (<= 91 main_~x~0)) (and (and (<= 52 main_~y~0) (<= main_~y~0 52) (<= main_~x~0 52)) (<= 52 main_~x~0)) (and (<= 93 main_~x~0) (and (<= main_~x~0 93) (<= 93 main_~y~0) (<= main_~y~0 93))) (and (<= 74 main_~x~0) (and (<= 74 main_~y~0) (<= main_~y~0 74) (<= main_~x~0 74))) (and (and (<= main_~y~0 71) (<= main_~x~0 71) (<= 71 main_~y~0)) (<= 71 main_~x~0)) (and (<= 57 main_~x~0) (and (<= 57 main_~y~0) (<= main_~x~0 57) (<= main_~y~0 57))) (and (<= 97 main_~x~0) (and (<= 97 main_~y~0) (<= main_~x~0 97) (<= main_~y~0 97))) (and (and (<= main_~x~0 81) (<= 81 main_~y~0) (<= main_~y~0 81)) (<= 81 main_~x~0)) (and (<= 84 main_~x~0) (and (<= main_~y~0 84) (<= 84 main_~y~0) (<= main_~x~0 84))) (and (and (<= 96 main_~y~0) (<= main_~x~0 96) (<= main_~y~0 96)) (<= 96 main_~x~0)) (and (<= 83 main_~x~0) (and (<= main_~y~0 83) (<= 83 main_~y~0) (<= main_~x~0 83))) (and (<= 62 main_~x~0) (and (<= main_~y~0 62) (<= main_~x~0 62) (<= 62 main_~y~0))) (and (and (<= main_~x~0 98) (<= main_~y~0 98) (<= 98 main_~y~0)) (<= 98 main_~x~0)) (and (and (<= 75 main_~y~0) (<= main_~x~0 75) (<= main_~y~0 75)) (<= 75 main_~x~0)) (and (and (<= 82 main_~y~0) (<= main_~y~0 82) (<= main_~x~0 82)) (<= 82 main_~x~0))) [2018-10-26 19:52:52,830 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 20) the Hoare annotation is: (and (<= main_~y~0 100) (< 99 main_~y~0)) [2018-10-26 19:52:52,830 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-26 19:52:52,830 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-26 19:52:52,831 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-26 19:52:52,831 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-26 19:52:52,831 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-26 19:52:52,831 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-26 19:52:52,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 07:52:52 BoogieIcfgContainer [2018-10-26 19:52:52,847 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 19:52:52,848 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 19:52:52,848 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 19:52:52,848 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 19:52:52,848 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:50:58" (3/4) ... [2018-10-26 19:52:52,852 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-26 19:52:52,857 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-26 19:52:52,857 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-26 19:52:52,857 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-26 19:52:52,860 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2018-10-26 19:52:52,860 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-10-26 19:52:52,860 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-26 19:52:52,906 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_bb42fdc5-6816-48be-ac6f-046e7968f114/bin-2019/utaipan/witness.graphml [2018-10-26 19:52:52,906 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 19:52:52,907 INFO L168 Benchmark]: Toolchain (without parser) took 115425.97 ms. Allocated memory was 1.0 GB in the beginning and 1.6 GB in the end (delta: 595.1 MB). Free memory was 961.8 MB in the beginning and 1.6 GB in the end (delta: -589.6 MB). Peak memory consumption was 5.5 MB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,908 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 982.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:52:52,908 INFO L168 Benchmark]: CACSL2BoogieTranslator took 192.29 ms. Allocated memory is still 1.0 GB. Free memory was 961.8 MB in the beginning and 951.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,908 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.11 ms. Allocated memory is still 1.0 GB. Free memory is still 951.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:52:52,908 INFO L168 Benchmark]: Boogie Preprocessor took 15.75 ms. Allocated memory is still 1.0 GB. Free memory was 951.1 MB in the beginning and 945.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,914 INFO L168 Benchmark]: RCFGBuilder took 423.65 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.8 MB). Free memory was 945.7 MB in the beginning and 1.1 GB in the end (delta: -197.2 MB). Peak memory consumption was 19.9 MB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,914 INFO L168 Benchmark]: TraceAbstraction took 114712.72 ms. Allocated memory was 1.2 GB in the beginning and 1.6 GB in the end (delta: 437.3 MB). Free memory was 1.1 GB in the beginning and 1.6 GB in the end (delta: -408.5 MB). Peak memory consumption was 749.7 MB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,915 INFO L168 Benchmark]: Witness Printer took 58.61 ms. Allocated memory is still 1.6 GB. Free memory was 1.6 GB in the beginning and 1.6 GB in the end (delta: 4.2 kB). Peak memory consumption was 4.2 kB. Max. memory is 11.5 GB. [2018-10-26 19:52:52,916 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 982.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 192.29 ms. Allocated memory is still 1.0 GB. Free memory was 961.8 MB in the beginning and 951.1 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 18.11 ms. Allocated memory is still 1.0 GB. Free memory is still 951.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 15.75 ms. Allocated memory is still 1.0 GB. Free memory was 951.1 MB in the beginning and 945.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 423.65 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.8 MB). Free memory was 945.7 MB in the beginning and 1.1 GB in the end (delta: -197.2 MB). Peak memory consumption was 19.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 114712.72 ms. Allocated memory was 1.2 GB in the beginning and 1.6 GB in the end (delta: 437.3 MB). Free memory was 1.1 GB in the beginning and 1.6 GB in the end (delta: -408.5 MB). Peak memory consumption was 749.7 MB. Max. memory is 11.5 GB. * Witness Printer took 58.61 ms. Allocated memory is still 1.6 GB. Free memory was 1.6 GB in the beginning and 1.6 GB in the end (delta: 4.2 kB). Peak memory consumption was 4.2 kB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: 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 - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((x <= 99 && 99 <= y) && y <= 99) && 99 <= x) || (((y <= 92 && 92 <= y) && x <= 92) && 92 <= x)) || (65 <= x && (y <= 65 && 65 <= y) && x <= 65)) || ((y <= 100 && 99 < y) && 100 <= x)) || (64 <= x && (x <= 64 && 64 <= y) && y <= 64)) || (76 <= x && (y <= 76 && x <= 76) && 76 <= y)) || (87 <= x && (x <= 87 && y <= 87) && 87 <= y)) || (((y <= 78 && 78 <= y) && x <= 78) && 78 <= x)) || (72 <= x && (y <= 72 && x <= 72) && 72 <= y)) || (((y <= 69 && 69 <= y) && x <= 69) && 69 <= x)) || (60 <= x && (x <= 60 && y <= 60) && 60 <= y)) || (67 <= x && (y <= 67 && x <= 67) && 67 <= y)) || (((y <= 55 && 55 <= y) && x <= 55) && 55 <= x)) || (((73 <= y && x <= 73) && y <= 73) && 73 <= x)) || (66 <= x && (y <= 66 && 66 <= y) && x <= 66)) || (((x <= 70 && y <= 70) && 70 <= y) && 70 <= x)) || (((x <= 95 && y <= 95) && 95 <= y) && 95 <= x)) || (((90 <= y && y <= 90) && x <= 90) && 90 <= x)) || (((y <= 59 && x <= 59) && 59 <= y) && 59 <= x)) || (85 <= x && (85 <= y && x <= 85) && y <= 85)) || (63 <= x && (y <= 63 && x <= 63) && 63 <= y)) || (((y <= 77 && x <= 77) && 77 <= y) && 77 <= x)) || (53 <= x && (y <= 53 && x <= 53) && 53 <= y)) || (((x <= 79 && y <= 79) && 79 <= y) && 79 <= x)) || (68 <= x && (68 <= y && y <= 68) && x <= 68)) || (54 <= x && (x <= 54 && 54 <= y) && y <= 54)) || (51 <= x && (51 <= y && x <= 51) && y <= 51)) || (((56 <= y && x <= 56) && y <= 56) && 56 <= x)) || (61 <= x && (y <= 61 && 61 <= y) && x <= 61)) || (88 <= x && (x <= 88 && y <= 88) && 88 <= y)) || ((y <= 50 && x <= 50) && 50 <= y)) || (80 <= x && (x <= 80 && 80 <= y) && y <= 80)) || (94 <= x && (x <= 94 && y <= 94) && 94 <= y)) || (89 <= x && (89 <= y && y <= 89) && x <= 89)) || (((86 <= y && x <= 86) && y <= 86) && 86 <= x)) || (58 <= x && (x <= 58 && y <= 58) && 58 <= y)) || (((x <= 91 && 91 <= y) && y <= 91) && 91 <= x)) || (((52 <= y && y <= 52) && x <= 52) && 52 <= x)) || (93 <= x && (x <= 93 && 93 <= y) && y <= 93)) || (74 <= x && (74 <= y && y <= 74) && x <= 74)) || (((y <= 71 && x <= 71) && 71 <= y) && 71 <= x)) || (57 <= x && (57 <= y && x <= 57) && y <= 57)) || (97 <= x && (97 <= y && x <= 97) && y <= 97)) || (((x <= 81 && 81 <= y) && y <= 81) && 81 <= x)) || (84 <= x && (y <= 84 && 84 <= y) && x <= 84)) || (((96 <= y && x <= 96) && y <= 96) && 96 <= x)) || (83 <= x && (y <= 83 && 83 <= y) && x <= 83)) || (62 <= x && (y <= 62 && x <= 62) && 62 <= y)) || (((x <= 98 && y <= 98) && 98 <= y) && 98 <= x)) || (((75 <= y && x <= 75) && y <= 75) && 75 <= x)) || (((82 <= y && y <= 82) && x <= 82) && 82 <= x) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 114.6s OverallTime, 65 OverallIterations, 102 TraceHistogramMax, 13.6s AutomataDifference, 0.0s DeadEndRemovalTime, 2.7s HoareAnnotationTime, HoareTripleCheckerStatistics: 958 SDtfs, 1348 SDslu, 18538 SDs, 0 SdLazy, 9435 SolverSat, 2379 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.8s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 19194 GetRequests, 15189 SyntacticMatches, 1015 SemanticMatches, 2990 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106812 ImplicationChecksByTransitivity, 86.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=315occurred in iteration=64, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 1.0 AbsIntWeakeningRatio, 0.3076923076923077 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 65 MinimizatonAttempts, 4003 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 71 PreInvPairs, 173 NumberOfFragments, 720 HoareAnnotationTreeSize, 71 FomulaSimplifications, 18375 FormulaSimplificationTreeSizeReduction, 0.7s HoareSimplificationTime, 7 FomulaSimplificationsInter, 200 FormulaSimplificationTreeSizeReductionInter, 1.9s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 2.6s SatisfiabilityAnalysisTime, 91.3s InterpolantComputationTime, 17699 NumberOfCodeBlocks, 16355 NumberOfCodeBlocksAsserted, 548 NumberOfCheckSat, 26187 ConstructedInterpolants, 0 QuantifiedInterpolants, 12342997 SizeOfPredicates, 49 NumberOfNonLiveVariables, 14311 ConjunctsInSsa, 1919 ConjunctsInUnsatCore, 187 InterpolantComputations, 3 PerfectInterpolantSequences, 368759/735027 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...