./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i20_o20_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i20_o20_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/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 4d7026bf672987d88e3a6ea48c2c5a690fd9a5f2 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-03 05:10:02,759 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 05:10:02,760 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 05:10:02,766 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 05:10:02,766 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 05:10:02,766 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 05:10:02,767 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 05:10:02,768 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 05:10:02,769 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 05:10:02,769 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 05:10:02,770 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-03 05:10:02,770 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-03 05:10:02,770 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-03 05:10:02,771 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-03 05:10:02,771 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-03 05:10:02,772 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-03 05:10:02,772 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-03 05:10:02,773 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-03 05:10:02,774 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-03 05:10:02,775 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-03 05:10:02,775 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-03 05:10:02,776 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-03 05:10:02,777 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-03 05:10:02,777 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-03 05:10:02,777 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-03 05:10:02,778 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-03 05:10:02,778 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-03 05:10:02,779 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-03 05:10:02,779 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-03 05:10:02,780 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-03 05:10:02,780 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-03 05:10:02,780 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-03 05:10:02,780 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-03 05:10:02,780 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-03 05:10:02,781 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-03 05:10:02,781 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-03 05:10:02,781 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-03 05:10:02,788 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 05:10:02,789 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 05:10:02,789 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 05:10:02,789 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 05:10:02,789 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 05:10:02,789 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 05:10:02,789 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 05:10:02,789 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 05:10:02,790 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 05:10:02,790 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 05:10:02,791 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 05:10:02,791 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 05:10:02,792 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 05:10:02,792 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 05:10:02,792 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_9dc67337-9ed8-4f1e-9f51-6db4186363f4/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 -> 4d7026bf672987d88e3a6ea48c2c5a690fd9a5f2 [2018-12-03 05:10:02,810 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 05:10:02,817 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 05:10:02,819 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 05:10:02,820 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-03 05:10:02,820 INFO L276 PluginConnector]: CDTParser initialized [2018-12-03 05:10:02,821 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i20_o20_true-unreach-call_true-termination.c [2018-12-03 05:10:02,857 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/data/c791a2457/ed89c6420c6f4e86a0caded44b2bf0d1/FLAG7929f3cd1 [2018-12-03 05:10:03,352 INFO L307 CDTParser]: Found 1 translation units. [2018-12-03 05:10:03,352 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/sv-benchmarks/c/recursive-simple/id_i20_o20_true-unreach-call_true-termination.c [2018-12-03 05:10:03,355 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/data/c791a2457/ed89c6420c6f4e86a0caded44b2bf0d1/FLAG7929f3cd1 [2018-12-03 05:10:03,869 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/data/c791a2457/ed89c6420c6f4e86a0caded44b2bf0d1 [2018-12-03 05:10:03,876 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 05:10:03,878 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-03 05:10:03,879 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-03 05:10:03,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-03 05:10:03,883 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-03 05:10:03,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:03,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a99b003 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03, skipping insertion in model container [2018-12-03 05:10:03,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:03,890 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-03 05:10:03,899 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-03 05:10:03,978 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-03 05:10:03,980 INFO L191 MainTranslator]: Completed pre-run [2018-12-03 05:10:03,988 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-03 05:10:03,995 INFO L195 MainTranslator]: Completed translation [2018-12-03 05:10:03,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03 WrapperNode [2018-12-03 05:10:03,996 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-03 05:10:03,996 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 05:10:03,996 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 05:10:03,996 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 05:10:04,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,004 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,007 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 05:10:04,008 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 05:10:04,008 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 05:10:04,008 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 05:10:04,013 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,013 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,013 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,013 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,015 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,017 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... [2018-12-03 05:10:04,018 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 05:10:04,018 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 05:10:04,018 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 05:10:04,018 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 05:10:04,018 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 05:10:04,080 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-03 05:10:04,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-03 05:10:04,080 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 05:10:04,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 05:10:04,080 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-03 05:10:04,080 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-03 05:10:04,080 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-12-03 05:10:04,081 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-12-03 05:10:04,156 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 05:10:04,156 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 05:10:04,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:10:04 BoogieIcfgContainer [2018-12-03 05:10:04,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 05:10:04,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 05:10:04,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 05:10:04,159 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 05:10:04,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 05:10:03" (1/3) ... [2018-12-03 05:10:04,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d0f6e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:10:04, skipping insertion in model container [2018-12-03 05:10:04,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 05:10:03" (2/3) ... [2018-12-03 05:10:04,160 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d0f6e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:10:04, skipping insertion in model container [2018-12-03 05:10:04,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:10:04" (3/3) ... [2018-12-03 05:10:04,161 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i20_o20_true-unreach-call_true-termination.c [2018-12-03 05:10:04,167 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 05:10:04,171 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 05:10:04,181 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 05:10:04,200 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 05:10:04,200 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 05:10:04,200 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 05:10:04,200 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 05:10:04,200 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 05:10:04,201 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 05:10:04,201 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 05:10:04,201 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 05:10:04,211 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-03 05:10:04,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 05:10:04,214 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:04,215 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:04,216 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:04,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:04,220 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-12-03 05:10:04,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:04,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,250 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:04,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,250 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:04,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:04,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 05:10:04,319 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 05:10:04,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-03 05:10:04,319 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 05:10:04,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 05:10:04,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 05:10:04,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-03 05:10:04,332 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-03 05:10:04,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:04,384 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-03 05:10:04,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 05:10:04,385 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-03 05:10:04,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:04,391 INFO L225 Difference]: With dead ends: 30 [2018-12-03 05:10:04,391 INFO L226 Difference]: Without dead ends: 18 [2018-12-03 05:10:04,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-03 05:10:04,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-03 05:10:04,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-03 05:10:04,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 05:10:04,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 05:10:04,416 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-03 05:10:04,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:04,416 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 05:10:04,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 05:10:04,416 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 05:10:04,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-03 05:10:04,418 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:04,418 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:04,418 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:04,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:04,418 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-12-03 05:10:04,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:04,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:04,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,419 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:04,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:04,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-03 05:10:04,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:04,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:04,461 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-03 05:10:04,462 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-12-03 05:10:04,482 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-03 05:10:04,482 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 05:10:04,573 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 05:10:04,574 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 106 root evaluator evaluations with a maximum evaluation depth of 3. Performed 106 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-12-03 05:10:04,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:04,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 05:10:04,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:04,580 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:04,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:04,586 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:04,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:04,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:04,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-03 05:10:04,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:04,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 05:10:04,738 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:04,738 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-12-03 05:10:04,738 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:04,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 05:10:04,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 05:10:04,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-12-03 05:10:04,739 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-12-03 05:10:04,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:04,772 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-03 05:10:04,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 05:10:04,772 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-12-03 05:10:04,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:04,773 INFO L225 Difference]: With dead ends: 25 [2018-12-03 05:10:04,773 INFO L226 Difference]: Without dead ends: 21 [2018-12-03 05:10:04,774 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-12-03 05:10:04,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-03 05:10:04,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-03 05:10:04,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 05:10:04,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 05:10:04,777 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-12-03 05:10:04,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:04,778 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 05:10:04,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 05:10:04,778 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 05:10:04,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-03 05:10:04,778 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:04,778 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:04,779 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:04,779 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:04,779 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-12-03 05:10:04,779 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:04,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:04,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:04,780 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:04,822 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 05:10:04,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:04,822 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:04,822 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:04,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:04,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:04,823 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:04,829 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:10:04,829 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:10:04,837 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 05:10:04,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:04,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:04,846 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-03 05:10:04,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:05,030 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-03 05:10:05,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:05,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-03 05:10:05,052 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:05,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 05:10:05,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 05:10:05,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-03 05:10:05,053 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-12-03 05:10:05,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:05,099 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-12-03 05:10:05,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 05:10:05,100 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-03 05:10:05,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:05,100 INFO L225 Difference]: With dead ends: 28 [2018-12-03 05:10:05,100 INFO L226 Difference]: Without dead ends: 24 [2018-12-03 05:10:05,101 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-03 05:10:05,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-03 05:10:05,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-03 05:10:05,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 05:10:05,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 05:10:05,104 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-12-03 05:10:05,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:05,105 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 05:10:05,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 05:10:05,105 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 05:10:05,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-03 05:10:05,106 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:05,106 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:05,106 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:05,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:05,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-12-03 05:10:05,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:05,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:05,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:05,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:05,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:05,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:05,159 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 05:10:05,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:05,160 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:05,160 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:05,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:05,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:05,160 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:05,166 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:10:05,166 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:10:05,176 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:10:05,176 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:05,178 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:05,188 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 05:10:05,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:05,443 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 05:10:05,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:05,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-12-03 05:10:05,458 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:05,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 05:10:05,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 05:10:05,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-03 05:10:05,458 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-12-03 05:10:05,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:05,498 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-03 05:10:05,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 05:10:05,498 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-12-03 05:10:05,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:05,499 INFO L225 Difference]: With dead ends: 31 [2018-12-03 05:10:05,499 INFO L226 Difference]: Without dead ends: 27 [2018-12-03 05:10:05,499 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-03 05:10:05,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-03 05:10:05,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-03 05:10:05,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 05:10:05,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 05:10:05,502 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-12-03 05:10:05,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:05,502 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 05:10:05,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 05:10:05,502 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 05:10:05,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 05:10:05,503 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:05,503 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:05,503 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:05,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:05,503 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-12-03 05:10:05,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:05,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:05,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:05,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:05,504 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:05,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:05,560 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 05:10:05,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:05,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:05,561 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:05,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:05,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:05,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:05,567 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:05,567 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:05,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:05,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:05,585 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-03 05:10:05,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:05,975 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-03 05:10:05,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:05,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-03 05:10:05,990 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:05,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 05:10:05,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 05:10:05,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-03 05:10:05,990 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-12-03 05:10:06,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:06,041 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-12-03 05:10:06,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 05:10:06,041 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-03 05:10:06,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:06,042 INFO L225 Difference]: With dead ends: 34 [2018-12-03 05:10:06,042 INFO L226 Difference]: Without dead ends: 30 [2018-12-03 05:10:06,042 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-12-03 05:10:06,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-03 05:10:06,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-03 05:10:06,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 05:10:06,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 05:10:06,045 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-12-03 05:10:06,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:06,045 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 05:10:06,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 05:10:06,045 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 05:10:06,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-03 05:10:06,046 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:06,046 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:06,046 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:06,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:06,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-12-03 05:10:06,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:06,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:06,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:06,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:06,047 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:06,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:06,100 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 05:10:06,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:06,100 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:06,100 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:06,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:06,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:06,100 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:06,107 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:10:06,107 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:10:06,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 05:10:06,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:06,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:06,126 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 05:10:06,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:06,674 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-03 05:10:06,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:06,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-12-03 05:10:06,689 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:06,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 05:10:06,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 05:10:06,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-12-03 05:10:06,689 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-12-03 05:10:06,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:06,738 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-03 05:10:06,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 05:10:06,739 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-12-03 05:10:06,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:06,739 INFO L225 Difference]: With dead ends: 37 [2018-12-03 05:10:06,739 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 05:10:06,740 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-12-03 05:10:06,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 05:10:06,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-03 05:10:06,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 05:10:06,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 05:10:06,742 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-12-03 05:10:06,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:06,743 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 05:10:06,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 05:10:06,743 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 05:10:06,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 05:10:06,743 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:06,743 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:06,743 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:06,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:06,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-12-03 05:10:06,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:06,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:06,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:06,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:06,744 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:06,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:06,797 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-03 05:10:06,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:06,797 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:06,797 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:06,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:06,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:06,797 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:06,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:10:06,804 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:10:06,815 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:10:06,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:06,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:06,828 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-03 05:10:06,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:07,652 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-03 05:10:07,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:07,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-12-03 05:10:07,666 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:07,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 05:10:07,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 05:10:07,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-12-03 05:10:07,667 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-12-03 05:10:07,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:07,725 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-12-03 05:10:07,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 05:10:07,726 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-12-03 05:10:07,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:07,726 INFO L225 Difference]: With dead ends: 40 [2018-12-03 05:10:07,726 INFO L226 Difference]: Without dead ends: 36 [2018-12-03 05:10:07,727 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-12-03 05:10:07,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-03 05:10:07,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-03 05:10:07,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 05:10:07,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 05:10:07,730 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-12-03 05:10:07,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:07,730 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 05:10:07,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 05:10:07,730 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 05:10:07,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 05:10:07,730 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:07,731 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:07,731 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:07,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:07,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-12-03 05:10:07,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:07,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:07,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:07,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:07,731 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:07,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:07,791 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-03 05:10:07,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:07,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:07,791 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:07,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:07,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:07,791 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:07,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:07,798 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:07,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:07,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:07,815 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-03 05:10:07,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:08,959 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-12-03 05:10:08,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:08,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-12-03 05:10:08,976 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:08,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 05:10:08,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 05:10:08,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-12-03 05:10:08,977 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-12-03 05:10:09,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:09,047 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-03 05:10:09,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 05:10:09,048 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-12-03 05:10:09,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:09,048 INFO L225 Difference]: With dead ends: 43 [2018-12-03 05:10:09,048 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 05:10:09,049 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-12-03 05:10:09,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 05:10:09,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-03 05:10:09,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 05:10:09,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 05:10:09,051 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-12-03 05:10:09,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:09,052 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 05:10:09,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 05:10:09,052 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 05:10:09,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-03 05:10:09,052 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:09,052 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:09,052 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:09,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:09,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-12-03 05:10:09,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:09,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:09,053 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:09,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:09,053 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:09,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:09,116 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-03 05:10:09,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:09,116 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:09,116 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:09,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:09,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:09,116 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:09,123 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:10:09,123 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:10:09,136 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 05:10:09,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:09,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:09,145 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-03 05:10:09,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:10,594 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-12-03 05:10:10,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:10,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-12-03 05:10:10,609 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:10,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 05:10:10,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 05:10:10,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 05:10:10,610 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-12-03 05:10:10,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:10,692 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-12-03 05:10:10,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 05:10:10,692 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-12-03 05:10:10,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:10,693 INFO L225 Difference]: With dead ends: 46 [2018-12-03 05:10:10,693 INFO L226 Difference]: Without dead ends: 42 [2018-12-03 05:10:10,693 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-12-03 05:10:10,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-03 05:10:10,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-03 05:10:10,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 05:10:10,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 05:10:10,696 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-12-03 05:10:10,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:10,697 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 05:10:10,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 05:10:10,697 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 05:10:10,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-03 05:10:10,697 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:10,697 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:10,697 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:10,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:10,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-12-03 05:10:10,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:10,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:10,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:10,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:10,698 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:10,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:10,775 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-03 05:10:10,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:10,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:10,775 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:10,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:10,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:10,775 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:10,781 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:10:10,781 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:10:10,791 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:10:10,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:10,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:10,801 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-03 05:10:10,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:12,790 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-12-03 05:10:12,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:12,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-12-03 05:10:12,805 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:12,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 05:10:12,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 05:10:12,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-12-03 05:10:12,806 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-12-03 05:10:12,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:12,890 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-03 05:10:12,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 05:10:12,890 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-03 05:10:12,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:12,891 INFO L225 Difference]: With dead ends: 49 [2018-12-03 05:10:12,891 INFO L226 Difference]: Without dead ends: 45 [2018-12-03 05:10:12,892 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 05:10:12,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-03 05:10:12,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-03 05:10:12,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 05:10:12,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 05:10:12,896 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-12-03 05:10:12,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:12,896 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 05:10:12,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 05:10:12,897 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 05:10:12,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-03 05:10:12,898 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:12,898 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:12,898 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:12,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:12,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-12-03 05:10:12,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:12,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:12,899 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:12,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:12,899 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:12,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-03 05:10:13,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:13,005 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:13,005 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:13,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:13,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:13,005 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:13,011 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:13,011 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:13,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:13,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:13,039 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-03 05:10:13,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:15,634 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-12-03 05:10:15,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:15,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-12-03 05:10:15,649 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:15,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 05:10:15,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 05:10:15,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-12-03 05:10:15,650 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-12-03 05:10:15,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:15,743 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-12-03 05:10:15,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 05:10:15,744 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-12-03 05:10:15,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:15,744 INFO L225 Difference]: With dead ends: 52 [2018-12-03 05:10:15,744 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 05:10:15,745 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 05:10:15,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 05:10:15,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 05:10:15,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 05:10:15,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 05:10:15,748 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-12-03 05:10:15,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:15,748 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 05:10:15,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 05:10:15,748 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 05:10:15,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 05:10:15,748 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:15,748 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:15,748 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:15,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:15,749 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-12-03 05:10:15,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:15,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:15,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:15,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:15,749 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:15,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:15,835 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-03 05:10:15,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:15,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:15,836 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:15,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:15,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:15,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:15,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:10:15,842 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:10:15,858 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 05:10:15,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:15,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:15,870 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-03 05:10:15,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:19,436 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-12-03 05:10:19,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:19,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-12-03 05:10:19,451 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:19,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 05:10:19,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 05:10:19,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-12-03 05:10:19,452 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-12-03 05:10:19,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:19,550 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-03 05:10:19,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 05:10:19,550 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-12-03 05:10:19,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:19,551 INFO L225 Difference]: With dead ends: 55 [2018-12-03 05:10:19,551 INFO L226 Difference]: Without dead ends: 51 [2018-12-03 05:10:19,551 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 05:10:19,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-03 05:10:19,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-03 05:10:19,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 05:10:19,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 05:10:19,554 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-12-03 05:10:19,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:19,555 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 05:10:19,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 05:10:19,555 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 05:10:19,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-03 05:10:19,555 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:19,555 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:19,555 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:19,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:19,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-12-03 05:10:19,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:19,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:19,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:19,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:19,556 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:19,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:19,636 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-03 05:10:19,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:19,637 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:19,637 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:19,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:19,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:19,637 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:19,643 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:10:19,644 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:10:19,658 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:10:19,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:19,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:19,672 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-03 05:10:19,673 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:23,867 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-12-03 05:10:23,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:23,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-12-03 05:10:23,891 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:23,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 05:10:23,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 05:10:23,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-12-03 05:10:23,892 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-12-03 05:10:24,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:24,005 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-12-03 05:10:24,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 05:10:24,006 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-12-03 05:10:24,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:24,006 INFO L225 Difference]: With dead ends: 58 [2018-12-03 05:10:24,006 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 05:10:24,007 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 05:10:24,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 05:10:24,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-03 05:10:24,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 05:10:24,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 05:10:24,010 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-12-03 05:10:24,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:24,010 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 05:10:24,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 05:10:24,010 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 05:10:24,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-03 05:10:24,011 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:24,011 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:24,011 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:24,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:24,011 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-12-03 05:10:24,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:24,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:24,011 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:24,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:24,012 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:24,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-03 05:10:24,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:24,117 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:24,117 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:24,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:24,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:24,118 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:24,124 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:24,124 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:24,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:24,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:24,149 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-03 05:10:24,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:29,328 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-12-03 05:10:29,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:29,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-12-03 05:10:29,344 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:29,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 05:10:29,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 05:10:29,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 05:10:29,345 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-12-03 05:10:29,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:29,481 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-03 05:10:29,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 05:10:29,481 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-12-03 05:10:29,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:29,482 INFO L225 Difference]: With dead ends: 61 [2018-12-03 05:10:29,482 INFO L226 Difference]: Without dead ends: 57 [2018-12-03 05:10:29,483 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 05:10:29,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-03 05:10:29,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-03 05:10:29,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 05:10:29,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 05:10:29,486 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-12-03 05:10:29,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:29,486 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 05:10:29,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 05:10:29,486 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 05:10:29,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 05:10:29,486 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:29,487 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:29,487 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:29,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:29,487 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-12-03 05:10:29,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:29,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:29,487 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:29,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:29,487 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:29,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:29,598 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-03 05:10:29,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:29,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:29,598 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:29,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:29,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:29,598 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:29,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:10:29,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:10:29,624 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 05:10:29,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:29,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:29,636 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-03 05:10:29,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:36,490 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-12-03 05:10:36,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:36,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-12-03 05:10:36,505 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:36,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 05:10:36,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 05:10:36,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 05:10:36,506 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-12-03 05:10:36,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:36,638 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-12-03 05:10:36,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 05:10:36,639 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-12-03 05:10:36,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:36,639 INFO L225 Difference]: With dead ends: 64 [2018-12-03 05:10:36,639 INFO L226 Difference]: Without dead ends: 60 [2018-12-03 05:10:36,640 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 05:10:36,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-03 05:10:36,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-03 05:10:36,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 05:10:36,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 05:10:36,642 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-12-03 05:10:36,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:36,643 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 05:10:36,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 05:10:36,643 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 05:10:36,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-03 05:10:36,643 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:36,643 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:36,643 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:36,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:36,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-12-03 05:10:36,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:36,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:36,644 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:36,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:36,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:36,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:36,766 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-03 05:10:36,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:36,767 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:36,767 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:36,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:36,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:36,767 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:36,784 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:10:36,784 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:10:36,802 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:10:36,802 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:10:36,804 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:36,815 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-03 05:10:36,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:39,034 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-03 05:10:39,142 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-12-03 05:10:46,820 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-12-03 05:10:46,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:10:46,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-12-03 05:10:46,843 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:10:46,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 05:10:46,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 05:10:46,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 05:10:46,844 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-12-03 05:10:46,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:10:46,990 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-03 05:10:46,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 05:10:46,990 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-12-03 05:10:46,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:10:46,990 INFO L225 Difference]: With dead ends: 67 [2018-12-03 05:10:46,990 INFO L226 Difference]: Without dead ends: 63 [2018-12-03 05:10:46,991 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 05:10:46,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-03 05:10:46,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-03 05:10:46,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 05:10:46,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 05:10:46,993 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-12-03 05:10:46,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:10:46,994 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 05:10:46,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 05:10:46,994 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 05:10:46,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-03 05:10:46,994 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:10:46,994 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:10:46,994 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:10:46,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:10:46,994 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-12-03 05:10:46,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:10:46,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:46,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:10:46,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:10:46,995 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:10:46,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:47,120 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-03 05:10:47,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:47,120 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:10:47,121 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:10:47,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:10:47,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:10:47,121 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:10:47,127 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:10:47,127 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:10:47,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:10:47,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:10:47,154 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-03 05:10:47,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:10:50,474 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-03 05:10:50,585 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-03 05:10:50,703 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-03 05:10:50,805 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-03 05:11:00,714 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-12-03 05:11:00,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:11:00,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-12-03 05:11:00,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:11:00,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 05:11:00,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 05:11:00,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 05:11:00,729 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-12-03 05:11:00,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:00,908 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-12-03 05:11:00,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 05:11:00,908 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-12-03 05:11:00,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:00,909 INFO L225 Difference]: With dead ends: 70 [2018-12-03 05:11:00,909 INFO L226 Difference]: Without dead ends: 66 [2018-12-03 05:11:00,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 05:11:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-03 05:11:00,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-03 05:11:00,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 05:11:00,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 05:11:00,912 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-12-03 05:11:00,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:00,912 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 05:11:00,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 05:11:00,912 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 05:11:00,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-03 05:11:00,912 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:11:00,912 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:11:00,913 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:11:00,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:11:00,913 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2018-12-03 05:11:00,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:11:00,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:00,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:11:00,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:00,913 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:11:00,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:01,045 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-03 05:11:01,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:01,045 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:11:01,045 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:11:01,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:11:01,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:01,046 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:11:01,054 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:11:01,054 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:11:01,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 05:11:01,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:11:01,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:11:01,099 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-03 05:11:01,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:11:12,473 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-12-03 05:11:12,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:11:12,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-12-03 05:11:12,487 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:11:12,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 05:11:12,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 05:11:12,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 05:11:12,488 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-12-03 05:11:12,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:12,640 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-03 05:11:12,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 05:11:12,640 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-12-03 05:11:12,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:12,641 INFO L225 Difference]: With dead ends: 73 [2018-12-03 05:11:12,641 INFO L226 Difference]: Without dead ends: 69 [2018-12-03 05:11:12,642 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 05:11:12,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-03 05:11:12,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-03 05:11:12,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 05:11:12,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 05:11:12,645 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-12-03 05:11:12,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:12,646 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 05:11:12,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 05:11:12,646 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 05:11:12,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 05:11:12,646 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:11:12,646 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:11:12,646 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:11:12,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:11:12,646 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2018-12-03 05:11:12,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:11:12,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:12,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:11:12,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:12,647 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:11:12,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-03 05:11:12,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:12,800 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:11:12,800 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:11:12,800 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:11:12,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:12,800 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:11:12,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 05:11:12,806 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 05:11:12,822 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 05:11:12,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:11:12,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:11:12,841 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-03 05:11:12,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:11:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-12-03 05:11:27,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:11:27,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-12-03 05:11:27,415 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:11:27,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 05:11:27,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 05:11:27,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 05:11:27,416 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-12-03 05:11:27,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:27,610 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-12-03 05:11:27,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 05:11:27,610 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-12-03 05:11:27,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:27,611 INFO L225 Difference]: With dead ends: 76 [2018-12-03 05:11:27,611 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 05:11:27,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 05:11:27,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 05:11:27,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-03 05:11:27,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 05:11:27,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 05:11:27,615 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-12-03 05:11:27,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:27,615 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 05:11:27,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 05:11:27,615 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 05:11:27,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-03 05:11:27,615 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:11:27,615 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:11:27,616 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:11:27,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:11:27,616 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2018-12-03 05:11:27,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:11:27,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:27,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:11:27,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:27,617 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:11:27,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:27,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-03 05:11:27,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:27,757 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:11:27,757 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:11:27,757 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:11:27,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:27,757 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:11:27,766 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:11:27,766 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 05:11:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:27,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:11:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-03 05:11:27,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:11:36,041 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-12-03 05:11:36,172 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-12-03 05:11:36,284 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-12-03 05:11:36,394 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-12-03 05:11:36,515 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-12-03 05:11:36,664 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-12-03 05:11:36,780 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-12-03 05:11:36,896 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-12-03 05:11:37,028 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2018-12-03 05:11:46,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-12-03 05:11:46,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:11:46,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 44 [2018-12-03 05:11:46,825 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:11:46,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 05:11:46,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 05:11:46,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1387, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 05:11:46,826 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-12-03 05:11:47,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:47,019 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-03 05:11:47,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 05:11:47,019 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-12-03 05:11:47,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:47,019 INFO L225 Difference]: With dead ends: 79 [2018-12-03 05:11:47,019 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 05:11:47,020 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 41 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1365, Invalid=2667, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 05:11:47,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 05:11:47,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-03 05:11:47,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 05:11:47,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 05:11:47,022 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-12-03 05:11:47,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:47,022 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 05:11:47,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 05:11:47,022 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 05:11:47,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-03 05:11:47,023 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:11:47,023 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:11:47,023 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:11:47,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:11:47,023 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2018-12-03 05:11:47,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:11:47,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:47,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 05:11:47,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:47,024 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:11:47,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:47,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-03 05:11:47,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:47,665 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 05:11:47,665 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 05:11:47,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 05:11:47,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 05:11:47,665 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 05:11:47,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 05:11:47,671 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 05:11:47,710 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 05:11:47,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 05:11:47,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 05:11:47,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-03 05:11:47,776 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 05:11:49,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-03 05:11:49,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 05:11:49,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 45 [2018-12-03 05:11:49,271 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 05:11:49,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 05:11:49,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 05:11:49,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 05:11:49,272 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 45 states. [2018-12-03 05:11:49,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:49,660 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-12-03 05:11:49,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 05:11:49,660 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 133 [2018-12-03 05:11:49,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:49,661 INFO L225 Difference]: With dead ends: 82 [2018-12-03 05:11:49,661 INFO L226 Difference]: Without dead ends: 78 [2018-12-03 05:11:49,661 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 263 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 05:11:49,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-03 05:11:49,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-03 05:11:49,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 05:11:49,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 05:11:49,664 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-12-03 05:11:49,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:49,665 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 05:11:49,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 05:11:49,665 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 05:11:49,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-03 05:11:49,666 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 05:11:49,666 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 05:11:49,666 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-03 05:11:49,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 05:11:49,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1226192145, now seen corresponding path program 21 times [2018-12-03 05:11:49,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 05:11:49,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:49,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 05:11:49,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 05:11:49,667 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 05:11:49,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 05:11:49,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 672 proven. 0 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-12-03 05:11:49,857 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 05:11:49,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2018-12-03 05:11:49,857 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 05:11:49,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 05:11:49,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 05:11:49,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2018-12-03 05:11:49,858 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-12-03 05:11:50,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 05:11:50,022 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 05:11:50,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 05:11:50,023 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-12-03 05:11:50,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 05:11:50,023 INFO L225 Difference]: With dead ends: 78 [2018-12-03 05:11:50,024 INFO L226 Difference]: Without dead ends: 0 [2018-12-03 05:11:50,024 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=830, Invalid=1426, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 05:11:50,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-03 05:11:50,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-03 05:11:50,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-03 05:11:50,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-03 05:11:50,025 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 139 [2018-12-03 05:11:50,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 05:11:50,025 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-03 05:11:50,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 05:11:50,025 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-03 05:11:50,026 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-03 05:11:50,029 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-03 05:11:50,048 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-03 05:11:50,048 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= 20 main_~input~0) (<= main_~input~0 20)) [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-12-03 05:11:50,048 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-12-03 05:11:50,049 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-12-03 05:11:50,049 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-12-03 05:11:50,049 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-12-03 05:11:50,049 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-12-03 05:11:50,049 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-12-03 05:11:50,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 05:11:50 BoogieIcfgContainer [2018-12-03 05:11:50,050 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-03 05:11:50,050 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-03 05:11:50,050 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-03 05:11:50,051 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-03 05:11:50,051 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:10:04" (3/4) ... [2018-12-03 05:11:50,053 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-03 05:11:50,056 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-03 05:11:50,057 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-03 05:11:50,057 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-12-03 05:11:50,059 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-03 05:11:50,059 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-03 05:11:50,059 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-03 05:11:50,079 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_9dc67337-9ed8-4f1e-9f51-6db4186363f4/bin-2019/utaipan/witness.graphml [2018-12-03 05:11:50,079 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-03 05:11:50,080 INFO L168 Benchmark]: Toolchain (without parser) took 106203.27 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 174.6 MB). Free memory was 952.4 MB in the beginning and 805.7 MB in the end (delta: 146.7 MB). Peak memory consumption was 321.3 MB. Max. memory is 11.5 GB. [2018-12-03 05:11:50,080 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-03 05:11:50,080 INFO L168 Benchmark]: CACSL2BoogieTranslator took 117.01 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-03 05:11:50,080 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.25 ms. Allocated memory is still 1.0 GB. Free memory is still 941.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-03 05:11:50,080 INFO L168 Benchmark]: Boogie Preprocessor took 9.97 ms. Allocated memory is still 1.0 GB. Free memory is still 941.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-03 05:11:50,081 INFO L168 Benchmark]: RCFGBuilder took 138.63 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 108.5 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -146.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. [2018-12-03 05:11:50,081 INFO L168 Benchmark]: TraceAbstraction took 105893.38 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 66.1 MB). Free memory was 1.1 GB in the beginning and 813.6 MB in the end (delta: 274.3 MB). Peak memory consumption was 340.3 MB. Max. memory is 11.5 GB. [2018-12-03 05:11:50,081 INFO L168 Benchmark]: Witness Printer took 28.85 ms. Allocated memory is still 1.2 GB. Free memory was 813.6 MB in the beginning and 805.7 MB in the end (delta: 7.9 MB). Peak memory consumption was 7.9 MB. Max. memory is 11.5 GB. [2018-12-03 05:11:50,082 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 117.01 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.25 ms. Allocated memory is still 1.0 GB. Free memory is still 941.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 9.97 ms. Allocated memory is still 1.0 GB. Free memory is still 941.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 138.63 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 108.5 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -146.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 105893.38 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 66.1 MB). Free memory was 1.1 GB in the beginning and 813.6 MB in the end (delta: 274.3 MB). Peak memory consumption was 340.3 MB. Max. memory is 11.5 GB. * Witness Printer took 28.85 ms. Allocated memory is still 1.2 GB. Free memory was 813.6 MB in the beginning and 805.7 MB in the end (delta: 7.9 MB). Peak memory consumption was 7.9 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 105.8s OverallTime, 22 OverallIterations, 22 TraceHistogramMax, 2.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 370 SDtfs, 527 SDslu, 4020 SDs, 0 SdLazy, 2623 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3824 GetRequests, 2625 SyntacticMatches, 423 SemanticMatches, 776 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8549 ImplicationChecksByTransitivity, 7.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 22 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 101.9s InterpolantComputationTime, 3192 NumberOfCodeBlocks, 3192 NumberOfCodeBlocksAsserted, 125 NumberOfCheckSat, 4650 ConstructedInterpolants, 0 QuantifiedInterpolants, 1298856 SizeOfPredicates, 229 NumberOfNonLiveVariables, 3560 ConjunctsInSsa, 543 ConjunctsInUnsatCore, 62 InterpolantComputations, 2 PerfectInterpolantSequences, 12104/27804 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...