./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aa418289 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/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 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-aa41828 [2018-11-23 14:27:15,697 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 14:27:15,699 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 14:27:15,706 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 14:27:15,706 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 14:27:15,707 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 14:27:15,708 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 14:27:15,709 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 14:27:15,710 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 14:27:15,710 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 14:27:15,711 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 14:27:15,711 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 14:27:15,712 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 14:27:15,712 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 14:27:15,713 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 14:27:15,713 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 14:27:15,714 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 14:27:15,715 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 14:27:15,716 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 14:27:15,717 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 14:27:15,718 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 14:27:15,719 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 14:27:15,720 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 14:27:15,720 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 14:27:15,721 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 14:27:15,721 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 14:27:15,722 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 14:27:15,722 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 14:27:15,722 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 14:27:15,723 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 14:27:15,723 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 14:27:15,723 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 14:27:15,723 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 14:27:15,724 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 14:27:15,724 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 14:27:15,724 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 14:27:15,725 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-23 14:27:15,732 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 14:27:15,732 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 14:27:15,733 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-23 14:27:15,733 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-23 14:27:15,733 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-23 14:27:15,733 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-23 14:27:15,733 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-23 14:27:15,733 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-23 14:27:15,734 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-23 14:27:15,734 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-23 14:27:15,734 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-23 14:27:15,734 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-23 14:27:15,734 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-23 14:27:15,735 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-23 14:27:15,735 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-23 14:27:15,736 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 14:27:15,736 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 14:27:15,737 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-23 14:27:15,737 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-23 14:27:15,738 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-23 14:27:15,738 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_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/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 -> 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca [2018-11-23 14:27:15,758 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 14:27:15,767 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 14:27:15,770 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 14:27:15,771 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 14:27:15,771 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 14:27:15,772 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-11-23 14:27:15,814 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/data/a30d86bf7/138afdffdd344f729187b783f35ae040/FLAGde713e626 [2018-11-23 14:27:16,218 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 14:27:16,218 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-11-23 14:27:16,222 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/data/a30d86bf7/138afdffdd344f729187b783f35ae040/FLAGde713e626 [2018-11-23 14:27:16,232 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/data/a30d86bf7/138afdffdd344f729187b783f35ae040 [2018-11-23 14:27:16,239 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 14:27:16,240 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-23 14:27:16,240 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 14:27:16,240 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 14:27:16,242 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 14:27:16,243 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33c486bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16, skipping insertion in model container [2018-11-23 14:27:16,245 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,251 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 14:27:16,261 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 14:27:16,368 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 14:27:16,371 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 14:27:16,379 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 14:27:16,388 INFO L195 MainTranslator]: Completed translation [2018-11-23 14:27:16,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16 WrapperNode [2018-11-23 14:27:16,388 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 14:27:16,389 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 14:27:16,389 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 14:27:16,389 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 14:27:16,395 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,398 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,402 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 14:27:16,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 14:27:16,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 14:27:16,402 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 14:27:16,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,408 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,410 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,411 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,412 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... [2018-11-23 14:27:16,412 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 14:27:16,412 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 14:27:16,413 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 14:27:16,413 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 14:27:16,413 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 14:27:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-23 14:27:16,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-23 14:27:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 14:27:16,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 14:27:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-23 14:27:16,487 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-23 14:27:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-11-23 14:27:16,487 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-11-23 14:27:16,573 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-23 14:27:16,573 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-23 14:27:16,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:16 BoogieIcfgContainer [2018-11-23 14:27:16,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-23 14:27:16,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-23 14:27:16,574 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-23 14:27:16,576 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-23 14:27:16,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:27:16" (1/3) ... [2018-11-23 14:27:16,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4cbf6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:27:16, skipping insertion in model container [2018-11-23 14:27:16,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:16" (2/3) ... [2018-11-23 14:27:16,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4cbf6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:27:16, skipping insertion in model container [2018-11-23 14:27:16,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:16" (3/3) ... [2018-11-23 14:27:16,578 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i15_o15_true-unreach-call_true-termination.c [2018-11-23 14:27:16,583 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-23 14:27:16,587 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-23 14:27:16,597 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-23 14:27:16,623 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-23 14:27:16,623 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-23 14:27:16,623 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-23 14:27:16,623 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-23 14:27:16,623 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-23 14:27:16,623 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-23 14:27:16,623 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-23 14:27:16,623 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-23 14:27:16,636 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-23 14:27:16,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-23 14:27:16,640 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:16,640 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:16,641 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:16,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:16,645 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-23 14:27:16,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:16,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:16,675 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:16,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:16,675 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:16,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:16,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 14:27:16,755 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 14:27:16,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-23 14:27:16,756 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 14:27:16,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-23 14:27:16,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-23 14:27:16,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-23 14:27:16,773 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-23 14:27:16,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:16,825 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-23 14:27:16,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-23 14:27:16,827 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-23 14:27:16,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:16,833 INFO L225 Difference]: With dead ends: 30 [2018-11-23 14:27:16,833 INFO L226 Difference]: Without dead ends: 18 [2018-11-23 14:27:16,835 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 [2018-11-23 14:27:16,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-23 14:27:16,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-23 14:27:16,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-23 14:27:16,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-23 14:27:16,861 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-23 14:27:16,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:16,861 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-23 14:27:16,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-23 14:27:16,861 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-23 14:27:16,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-23 14:27:16,863 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:16,863 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:16,863 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:16,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:16,863 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-23 14:27:16,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:16,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:16,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:16,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:16,865 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:16,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:16,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 14:27:16,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:16,906 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:16,907 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-23 14:27:16,908 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-11-23 14:27:16,930 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 14:27:16,930 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 14:27:17,043 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 14:27:17,044 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. [2018-11-23 14:27:17,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:17,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 14:27:17,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:17,053 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:17,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:17,060 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 14:27:17,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:17,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:17,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 14:27:17,102 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:17,287 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-23 14:27:17,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:17,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-11-23 14:27:17,303 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:17,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-23 14:27:17,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-23 14:27:17,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-11-23 14:27:17,304 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-23 14:27:17,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:17,353 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-23 14:27:17,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-23 14:27:17,354 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-23 14:27:17,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:17,354 INFO L225 Difference]: With dead ends: 25 [2018-11-23 14:27:17,354 INFO L226 Difference]: Without dead ends: 21 [2018-11-23 14:27:17,355 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 [2018-11-23 14:27:17,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-23 14:27:17,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-23 14:27:17,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-23 14:27:17,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-23 14:27:17,359 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-23 14:27:17,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:17,360 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-23 14:27:17,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-23 14:27:17,360 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-23 14:27:17,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-23 14:27:17,361 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:17,361 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:17,361 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:17,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:17,362 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-23 14:27:17,362 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:17,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:17,363 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:17,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:17,363 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:17,410 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 14:27:17,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:17,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:17,410 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:17,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:17,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:17,411 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:17,418 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 14:27:17,418 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 14:27:17,427 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-23 14:27:17,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:17,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:17,438 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 14:27:17,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:17,635 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 14:27:17,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:17,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-11-23 14:27:17,650 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:17,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-23 14:27:17,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-23 14:27:17,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-11-23 14:27:17,651 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-23 14:27:17,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:17,697 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-23 14:27:17,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-23 14:27:17,698 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-23 14:27:17,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:17,699 INFO L225 Difference]: With dead ends: 28 [2018-11-23 14:27:17,699 INFO L226 Difference]: Without dead ends: 24 [2018-11-23 14:27:17,700 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 [2018-11-23 14:27:17,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-23 14:27:17,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-23 14:27:17,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-23 14:27:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-23 14:27:17,703 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-23 14:27:17,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:17,703 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-23 14:27:17,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-23 14:27:17,704 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-23 14:27:17,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-23 14:27:17,704 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:17,704 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:17,704 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:17,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:17,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-11-23 14:27:17,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:17,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:17,705 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:17,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:17,706 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:17,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:17,768 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 14:27:17,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:17,769 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:17,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:17,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:17,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:17,769 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:17,778 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 14:27:17,778 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 14:27:17,799 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 14:27:17,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:17,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:17,818 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 14:27:17,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:18,116 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-23 14:27:18,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:18,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-11-23 14:27:18,130 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:18,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-23 14:27:18,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-23 14:27:18,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-11-23 14:27:18,131 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-23 14:27:18,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:18,175 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-23 14:27:18,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-23 14:27:18,175 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-23 14:27:18,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:18,176 INFO L225 Difference]: With dead ends: 31 [2018-11-23 14:27:18,176 INFO L226 Difference]: Without dead ends: 27 [2018-11-23 14:27:18,176 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 [2018-11-23 14:27:18,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-23 14:27:18,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-23 14:27:18,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-23 14:27:18,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-23 14:27:18,179 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-23 14:27:18,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:18,179 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-23 14:27:18,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-23 14:27:18,180 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-23 14:27:18,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-23 14:27:18,180 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:18,180 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:18,180 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:18,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:18,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-11-23 14:27:18,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:18,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:18,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:18,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:18,181 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:18,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:18,229 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 14:27:18,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:18,229 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:18,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:18,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:18,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:18,230 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:18,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:18,238 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 14:27:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:18,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:18,262 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 14:27:18,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:18,681 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-23 14:27:18,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:18,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-11-23 14:27:18,709 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:18,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-23 14:27:18,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-23 14:27:18,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-11-23 14:27:18,710 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-23 14:27:18,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:18,754 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-23 14:27:18,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-23 14:27:18,758 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-23 14:27:18,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:18,758 INFO L225 Difference]: With dead ends: 34 [2018-11-23 14:27:18,759 INFO L226 Difference]: Without dead ends: 30 [2018-11-23 14:27:18,759 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 [2018-11-23 14:27:18,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-23 14:27:18,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-23 14:27:18,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-23 14:27:18,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-23 14:27:18,763 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-23 14:27:18,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:18,763 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-23 14:27:18,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-23 14:27:18,763 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-23 14:27:18,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-23 14:27:18,764 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:18,764 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:18,764 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:18,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:18,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-11-23 14:27:18,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:18,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:18,765 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:18,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:18,765 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:18,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:18,818 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 14:27:18,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:18,819 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:18,819 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:18,819 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:18,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:18,819 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:18,824 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 14:27:18,824 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 14:27:18,833 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-23 14:27:18,833 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:18,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:18,846 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 14:27:18,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:19,530 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 14:27:19,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:19,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-11-23 14:27:19,544 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:19,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-23 14:27:19,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-23 14:27:19,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-11-23 14:27:19,545 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-23 14:27:19,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:19,597 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-23 14:27:19,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-23 14:27:19,597 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-23 14:27:19,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:19,598 INFO L225 Difference]: With dead ends: 37 [2018-11-23 14:27:19,598 INFO L226 Difference]: Without dead ends: 33 [2018-11-23 14:27:19,599 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 [2018-11-23 14:27:19,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-23 14:27:19,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-23 14:27:19,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-23 14:27:19,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-23 14:27:19,603 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-23 14:27:19,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:19,603 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-23 14:27:19,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-23 14:27:19,603 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-23 14:27:19,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-23 14:27:19,604 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:19,604 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:19,604 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:19,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:19,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-11-23 14:27:19,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:19,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:19,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:19,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:19,605 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:19,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:19,680 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 14:27:19,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:19,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:19,681 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:19,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:19,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:19,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:19,689 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 14:27:19,689 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 14:27:19,699 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 14:27:19,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:19,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:19,710 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 14:27:19,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:20,502 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-23 14:27:20,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:20,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-11-23 14:27:20,517 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:20,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-23 14:27:20,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-23 14:27:20,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-11-23 14:27:20,517 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-23 14:27:20,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:20,579 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-23 14:27:20,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-23 14:27:20,579 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-23 14:27:20,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:20,580 INFO L225 Difference]: With dead ends: 40 [2018-11-23 14:27:20,580 INFO L226 Difference]: Without dead ends: 36 [2018-11-23 14:27:20,581 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 [2018-11-23 14:27:20,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-23 14:27:20,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-23 14:27:20,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-23 14:27:20,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-23 14:27:20,585 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-23 14:27:20,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:20,585 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-23 14:27:20,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-23 14:27:20,585 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-23 14:27:20,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-23 14:27:20,586 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:20,586 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:20,586 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:20,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:20,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-11-23 14:27:20,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:20,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:20,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:20,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:20,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:20,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:20,646 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 14:27:20,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:20,647 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:20,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:20,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:20,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:20,647 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:20,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:20,654 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 14:27:20,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:20,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:20,673 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 14:27:20,673 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:21,774 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-23 14:27:21,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:21,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-11-23 14:27:21,789 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:21,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-23 14:27:21,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-23 14:27:21,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-11-23 14:27:21,789 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-23 14:27:21,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:21,877 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-23 14:27:21,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-23 14:27:21,877 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-23 14:27:21,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:21,878 INFO L225 Difference]: With dead ends: 43 [2018-11-23 14:27:21,878 INFO L226 Difference]: Without dead ends: 39 [2018-11-23 14:27:21,878 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 [2018-11-23 14:27:21,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-23 14:27:21,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-23 14:27:21,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-23 14:27:21,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-23 14:27:21,881 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-23 14:27:21,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:21,882 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-23 14:27:21,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-23 14:27:21,882 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-23 14:27:21,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-23 14:27:21,882 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:21,883 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:21,883 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:21,883 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:21,883 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-11-23 14:27:21,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:21,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:21,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:21,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:21,884 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:21,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:21,956 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 14:27:21,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:21,956 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:21,956 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:21,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:21,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:21,956 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:21,963 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 14:27:21,963 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 14:27:21,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-23 14:27:21,978 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:21,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:21,992 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 14:27:21,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:23,478 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-23 14:27:23,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:23,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-11-23 14:27:23,493 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:23,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-23 14:27:23,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-23 14:27:23,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-11-23 14:27:23,494 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-23 14:27:23,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:23,568 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-23 14:27:23,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-23 14:27:23,568 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-23 14:27:23,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:23,569 INFO L225 Difference]: With dead ends: 46 [2018-11-23 14:27:23,569 INFO L226 Difference]: Without dead ends: 42 [2018-11-23 14:27:23,570 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 [2018-11-23 14:27:23,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-23 14:27:23,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-23 14:27:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-23 14:27:23,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-23 14:27:23,572 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-23 14:27:23,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:23,572 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-23 14:27:23,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-23 14:27:23,573 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-23 14:27:23,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-23 14:27:23,574 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:23,574 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:23,574 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:23,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:23,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-11-23 14:27:23,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:23,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:23,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:23,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:23,575 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:23,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:23,666 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 14:27:23,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:23,667 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:23,667 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:23,667 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:23,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:23,667 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:23,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 14:27:23,672 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 14:27:23,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 14:27:23,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:23,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:23,697 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 14:27:23,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:25,691 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-23 14:27:25,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:25,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-11-23 14:27:25,707 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:25,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-23 14:27:25,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-23 14:27:25,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-11-23 14:27:25,707 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-23 14:27:25,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:25,779 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-23 14:27:25,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-23 14:27:25,780 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-23 14:27:25,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:25,781 INFO L225 Difference]: With dead ends: 49 [2018-11-23 14:27:25,781 INFO L226 Difference]: Without dead ends: 45 [2018-11-23 14:27:25,781 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 [2018-11-23 14:27:25,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-23 14:27:25,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-23 14:27:25,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-23 14:27:25,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-23 14:27:25,784 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-23 14:27:25,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:25,784 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-23 14:27:25,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-23 14:27:25,784 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-23 14:27:25,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-23 14:27:25,787 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:25,787 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:25,788 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:25,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:25,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-11-23 14:27:25,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:25,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:25,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:25,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:25,789 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:25,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:25,900 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 14:27:25,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:25,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:25,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:25,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:25,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:25,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:25,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:25,909 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 14:27:25,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:25,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:25,941 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 14:27:25,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:28,531 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-23 14:27:28,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:28,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-11-23 14:27:28,546 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:28,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-23 14:27:28,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-23 14:27:28,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-11-23 14:27:28,547 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-23 14:27:28,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:28,644 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-23 14:27:28,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-23 14:27:28,645 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-23 14:27:28,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:28,645 INFO L225 Difference]: With dead ends: 52 [2018-11-23 14:27:28,645 INFO L226 Difference]: Without dead ends: 48 [2018-11-23 14:27:28,646 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 [2018-11-23 14:27:28,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-23 14:27:28,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-23 14:27:28,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-23 14:27:28,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-23 14:27:28,650 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-23 14:27:28,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:28,650 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-23 14:27:28,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-23 14:27:28,650 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-23 14:27:28,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-23 14:27:28,651 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:28,651 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:28,651 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:28,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:28,652 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-11-23 14:27:28,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:28,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:28,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:28,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:28,653 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:28,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:28,763 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 14:27:28,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:28,763 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:28,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:28,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:28,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:28,763 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:28,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 14:27:28,770 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 14:27:28,785 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-23 14:27:28,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:28,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:28,796 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 14:27:28,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:31,959 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-23 14:27:31,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:31,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-11-23 14:27:31,974 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:31,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-23 14:27:31,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-23 14:27:31,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-11-23 14:27:31,975 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-23 14:27:32,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:32,084 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-23 14:27:32,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-23 14:27:32,085 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-23 14:27:32,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:32,085 INFO L225 Difference]: With dead ends: 55 [2018-11-23 14:27:32,085 INFO L226 Difference]: Without dead ends: 51 [2018-11-23 14:27:32,086 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 [2018-11-23 14:27:32,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-23 14:27:32,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-23 14:27:32,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-23 14:27:32,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-23 14:27:32,090 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-23 14:27:32,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:32,090 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-23 14:27:32,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-23 14:27:32,090 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-23 14:27:32,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-23 14:27:32,093 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:32,093 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:32,093 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:32,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:32,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-11-23 14:27:32,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:32,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:32,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:32,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:32,094 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:32,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:32,223 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 14:27:32,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:32,223 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:32,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:32,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:32,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:32,224 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:32,240 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 14:27:32,241 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 14:27:32,255 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 14:27:32,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:32,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:32,270 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 14:27:32,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:36,467 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-23 14:27:36,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:36,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-11-23 14:27:36,494 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:36,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-23 14:27:36,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-23 14:27:36,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-11-23 14:27:36,495 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-23 14:27:36,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:36,636 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-23 14:27:36,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-23 14:27:36,636 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-23 14:27:36,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:36,637 INFO L225 Difference]: With dead ends: 58 [2018-11-23 14:27:36,637 INFO L226 Difference]: Without dead ends: 54 [2018-11-23 14:27:36,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-11-23 14:27:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-23 14:27:36,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-23 14:27:36,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-23 14:27:36,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-23 14:27:36,642 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-23 14:27:36,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:36,642 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-23 14:27:36,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-23 14:27:36,642 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-23 14:27:36,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-23 14:27:36,643 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:36,643 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:36,643 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:36,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:36,643 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-11-23 14:27:36,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:36,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:36,644 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:36,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:36,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:36,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:36,771 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 14:27:36,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:36,771 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:36,771 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:36,771 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:36,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:36,771 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:36,777 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:36,777 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 14:27:36,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:36,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:36,807 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 14:27:36,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:41,834 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-23 14:27:41,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:41,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-11-23 14:27:41,849 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:41,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-23 14:27:41,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-23 14:27:41,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-11-23 14:27:41,850 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-23 14:27:41,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:41,965 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-23 14:27:41,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-23 14:27:41,966 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-23 14:27:41,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:41,966 INFO L225 Difference]: With dead ends: 61 [2018-11-23 14:27:41,966 INFO L226 Difference]: Without dead ends: 57 [2018-11-23 14:27:41,967 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 [2018-11-23 14:27:41,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-23 14:27:41,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-23 14:27:41,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-23 14:27:41,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-23 14:27:41,970 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-23 14:27:41,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:41,970 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-23 14:27:41,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-23 14:27:41,970 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-23 14:27:41,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-23 14:27:41,970 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:41,971 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:41,971 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:41,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:41,971 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-11-23 14:27:41,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:41,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:41,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 14:27:41,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:41,971 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:41,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:42,083 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 14:27:42,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:42,083 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:42,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:42,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:42,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:42,083 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:42,093 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 14:27:42,093 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 14:27:42,127 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-23 14:27:42,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:42,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:42,146 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 14:27:42,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:48,326 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-23 14:27:48,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:48,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 34 [2018-11-23 14:27:48,341 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:48,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-23 14:27:48,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-23 14:27:48,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-11-23 14:27:48,342 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-23 14:27:48,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:48,500 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-23 14:27:48,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-23 14:27:48,501 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-23 14:27:48,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:48,501 INFO L225 Difference]: With dead ends: 64 [2018-11-23 14:27:48,502 INFO L226 Difference]: Without dead ends: 60 [2018-11-23 14:27:48,502 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2018-11-23 14:27:48,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-23 14:27:48,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-23 14:27:48,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-23 14:27:48,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-23 14:27:48,506 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-23 14:27:48,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:48,506 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-23 14:27:48,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-23 14:27:48,506 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-23 14:27:48,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-23 14:27:48,507 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:48,507 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:48,507 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:48,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:48,508 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-11-23 14:27:48,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:48,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:48,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:48,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:48,508 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:48,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:48,927 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 14:27:48,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:48,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 14:27:48,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 14:27:48,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 14:27:48,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 14:27:48,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 14:27:48,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 14:27:48,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 14:27:48,949 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 14:27:48,949 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 14:27:48,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 14:27:48,985 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 14:27:48,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 14:27:49,864 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 14:27:49,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 14:27:49,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2018-11-23 14:27:49,879 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 14:27:49,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-23 14:27:49,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-23 14:27:49,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-11-23 14:27:49,880 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2018-11-23 14:27:50,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:50,133 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-23 14:27:50,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-23 14:27:50,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2018-11-23 14:27:50,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:50,134 INFO L225 Difference]: With dead ends: 67 [2018-11-23 14:27:50,134 INFO L226 Difference]: Without dead ends: 63 [2018-11-23 14:27:50,135 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-11-23 14:27:50,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-23 14:27:50,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-23 14:27:50,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-23 14:27:50,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-23 14:27:50,137 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-23 14:27:50,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:50,138 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-23 14:27:50,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-23 14:27:50,138 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-23 14:27:50,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-23 14:27:50,139 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 14:27:50,139 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 14:27:50,139 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 14:27:50,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 14:27:50,139 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-11-23 14:27:50,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 14:27:50,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:50,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 14:27:50,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 14:27:50,140 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 14:27:50,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 14:27:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-23 14:27:50,310 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 14:27:50,310 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2018-11-23 14:27:50,310 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 14:27:50,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-23 14:27:50,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-23 14:27:50,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-11-23 14:27:50,311 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-23 14:27:50,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 14:27:50,446 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-11-23 14:27:50,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-23 14:27:50,446 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-23 14:27:50,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 14:27:50,447 INFO L225 Difference]: With dead ends: 63 [2018-11-23 14:27:50,447 INFO L226 Difference]: Without dead ends: 0 [2018-11-23 14:27:50,448 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2018-11-23 14:27:50,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-23 14:27:50,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-23 14:27:50,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-23 14:27:50,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-23 14:27:50,448 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 109 [2018-11-23 14:27:50,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 14:27:50,448 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-23 14:27:50,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-23 14:27:50,449 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-23 14:27:50,449 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-23 14:27:50,452 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-23 14:27:50,480 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-23 14:27:50,480 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-23 14:27:50,481 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= main_~input~0 15) (<= 15 main_~input~0)) [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-11-23 14:27:50,481 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-11-23 14:27:50,482 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-11-23 14:27:50,482 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-11-23 14:27:50,482 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-11-23 14:27:50,482 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-11-23 14:27:50,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 02:27:50 BoogieIcfgContainer [2018-11-23 14:27:50,484 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-23 14:27:50,484 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-23 14:27:50,484 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-23 14:27:50,484 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-23 14:27:50,485 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:16" (3/4) ... [2018-11-23 14:27:50,488 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-23 14:27:50,492 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-23 14:27:50,492 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-23 14:27:50,492 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-11-23 14:27:50,495 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-23 14:27:50,495 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-23 14:27:50,495 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-23 14:27:50,520 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_1c06ce36-e242-48c2-a1b2-91227a5c4b6c/bin-2019/utaipan/witness.graphml [2018-11-23 14:27:50,520 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-23 14:27:50,521 INFO L168 Benchmark]: Toolchain (without parser) took 34282.03 ms. Allocated memory was 1.0 GB in the beginning and 1.6 GB in the end (delta: 575.7 MB). Free memory was 959.2 MB in the beginning and 1.1 GB in the end (delta: -98.2 MB). Peak memory consumption was 477.5 MB. Max. memory is 11.5 GB. [2018-11-23 14:27:50,522 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 14:27:50,522 INFO L168 Benchmark]: CACSL2BoogieTranslator took 148.71 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-23 14:27:50,522 INFO L168 Benchmark]: Boogie Procedure Inliner took 13.13 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 14:27:50,522 INFO L168 Benchmark]: Boogie Preprocessor took 10.03 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-23 14:27:50,523 INFO L168 Benchmark]: RCFGBuilder took 161.05 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -178.0 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. [2018-11-23 14:27:50,523 INFO L168 Benchmark]: TraceAbstraction took 33909.94 ms. Allocated memory was 1.2 GB in the beginning and 1.6 GB in the end (delta: 440.4 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 66.4 MB). Peak memory consumption was 506.8 MB. Max. memory is 11.5 GB. [2018-11-23 14:27:50,523 INFO L168 Benchmark]: Witness Printer took 36.33 ms. Allocated memory is still 1.6 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 24 B). Peak memory consumption was 24 B. Max. memory is 11.5 GB. [2018-11-23 14:27:50,525 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 148.71 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 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 13.13 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.03 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 161.05 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -178.0 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 33909.94 ms. Allocated memory was 1.2 GB in the beginning and 1.6 GB in the end (delta: 440.4 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 66.4 MB). Peak memory consumption was 506.8 MB. Max. memory is 11.5 GB. * Witness Printer took 36.33 ms. Allocated memory is still 1.6 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 24 B). Peak memory consumption was 24 B. 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, 33.8s OverallTime, 17 OverallIterations, 17 TraceHistogramMax, 1.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 285 SDtfs, 322 SDslu, 2582 SDs, 0 SdLazy, 1616 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2309 GetRequests, 1597 SyntacticMatches, 241 SemanticMatches, 471 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 3.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=16, 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, 17 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, 0.2s SatisfiabilityAnalysisTime, 31.0s InterpolantComputationTime, 1952 NumberOfCodeBlocks, 1952 NumberOfCodeBlocksAsserted, 77 NumberOfCheckSat, 2820 ConstructedInterpolants, 0 QuantifiedInterpolants, 613896 SizeOfPredicates, 134 NumberOfNonLiveVariables, 2145 ConjunctsInSsa, 333 ConjunctsInUnsatCore, 47 InterpolantComputations, 2 PerfectInterpolantSequences, 5529/12304 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...