./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i --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_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i -s /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 76260ed82768318ee6f3ac3cb9cfff5a60080963 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-aa41828 [2018-11-22 22:12:50,824 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-22 22:12:50,825 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-22 22:12:50,832 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-22 22:12:50,832 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-22 22:12:50,833 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-22 22:12:50,834 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-22 22:12:50,835 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-22 22:12:50,836 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-22 22:12:50,837 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-22 22:12:50,837 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-22 22:12:50,837 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-22 22:12:50,838 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-22 22:12:50,839 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-22 22:12:50,840 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-22 22:12:50,840 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-22 22:12:50,841 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-22 22:12:50,842 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-22 22:12:50,844 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-22 22:12:50,845 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-22 22:12:50,845 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-22 22:12:50,846 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-22 22:12:50,848 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-22 22:12:50,848 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-22 22:12:50,848 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-22 22:12:50,849 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-22 22:12:50,850 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-22 22:12:50,850 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-22 22:12:50,851 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-22 22:12:50,852 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-22 22:12:50,852 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-22 22:12:50,852 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-22 22:12:50,852 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-22 22:12:50,853 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-22 22:12:50,853 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-22 22:12:50,854 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-22 22:12:50,854 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-22 22:12:50,864 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-22 22:12:50,864 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-22 22:12:50,865 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-22 22:12:50,865 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-22 22:12:50,865 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-22 22:12:50,865 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-22 22:12:50,865 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-22 22:12:50,866 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-22 22:12:50,867 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-22 22:12:50,867 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-22 22:12:50,867 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-22 22:12:50,867 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-22 22:12:50,867 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-22 22:12:50,867 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-22 22:12:50,868 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-22 22:12:50,868 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-22 22:12:50,869 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-22 22:12:50,869 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-22 22:12:50,870 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-22 22:12:50,870 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-22 22:12:50,870 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-22 22:12:50,870 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-22 22:12:50,870 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_6d44357e-081a-419d-9315-72d6747a87bc/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 -> 76260ed82768318ee6f3ac3cb9cfff5a60080963 [2018-11-22 22:12:50,891 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-22 22:12:50,900 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-22 22:12:50,902 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-22 22:12:50,902 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-22 22:12:50,903 INFO L276 PluginConnector]: CDTParser initialized [2018-11-22 22:12:50,903 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-11-22 22:12:50,940 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/data/a786e08b4/59b7b1c59f2a48669ae349a6505f7d61/FLAG7545b5321 [2018-11-22 22:12:51,340 INFO L307 CDTParser]: Found 1 translation units. [2018-11-22 22:12:51,340 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-11-22 22:12:51,344 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/data/a786e08b4/59b7b1c59f2a48669ae349a6505f7d61/FLAG7545b5321 [2018-11-22 22:12:51,352 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/data/a786e08b4/59b7b1c59f2a48669ae349a6505f7d61 [2018-11-22 22:12:51,354 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-22 22:12:51,355 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-22 22:12:51,355 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-22 22:12:51,355 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-22 22:12:51,357 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-22 22:12:51,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,359 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 22.11 10:12:51, skipping insertion in model container [2018-11-22 22:12:51,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-22 22:12:51,377 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-22 22:12:51,481 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-22 22:12:51,483 INFO L191 MainTranslator]: Completed pre-run [2018-11-22 22:12:51,492 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-22 22:12:51,499 INFO L195 MainTranslator]: Completed translation [2018-11-22 22:12:51,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51 WrapperNode [2018-11-22 22:12:51,500 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-22 22:12:51,500 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-22 22:12:51,500 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-22 22:12:51,500 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-22 22:12:51,505 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,508 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,511 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-22 22:12:51,512 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-22 22:12:51,512 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-22 22:12:51,512 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-22 22:12:51,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,518 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,518 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,518 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,520 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,524 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,524 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... [2018-11-22 22:12:51,525 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-22 22:12:51,525 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-22 22:12:51,525 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-22 22:12:51,525 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-22 22:12:51,526 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:51,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-22 22:12:51,598 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-22 22:12:51,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-22 22:12:51,598 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-22 22:12:51,598 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-22 22:12:51,599 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-22 22:12:51,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-22 22:12:51,599 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-22 22:12:51,688 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-22 22:12:51,688 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-11-22 22:12:51,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:12:51 BoogieIcfgContainer [2018-11-22 22:12:51,688 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-22 22:12:51,689 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-22 22:12:51,689 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-22 22:12:51,691 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-22 22:12:51,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 10:12:51" (1/3) ... [2018-11-22 22:12:51,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a6d6f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 10:12:51, skipping insertion in model container [2018-11-22 22:12:51,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 10:12:51" (2/3) ... [2018-11-22 22:12:51,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a6d6f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 10:12:51, skipping insertion in model container [2018-11-22 22:12:51,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:12:51" (3/3) ... [2018-11-22 22:12:51,693 INFO L112 eAbstractionObserver]: Analyzing ICFG gr2006_true-unreach-call_true-termination.c.i [2018-11-22 22:12:51,699 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-22 22:12:51,703 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-22 22:12:51,712 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-22 22:12:51,736 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-22 22:12:51,736 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-22 22:12:51,736 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-22 22:12:51,736 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-22 22:12:51,736 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-22 22:12:51,736 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-22 22:12:51,736 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-22 22:12:51,736 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-22 22:12:51,746 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-22 22:12:51,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-22 22:12:51,750 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:51,750 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:51,751 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:51,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:51,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1001202113, now seen corresponding path program 1 times [2018-11-22 22:12:51,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:51,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:51,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,797 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:51,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:51,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:12:51,830 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:12:51,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-22 22:12:51,831 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-22 22:12:51,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-22 22:12:51,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-22 22:12:51,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-22 22:12:51,844 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-11-22 22:12:51,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:51,861 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2018-11-22 22:12:51,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-22 22:12:51,862 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-22 22:12:51,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:51,867 INFO L225 Difference]: With dead ends: 32 [2018-11-22 22:12:51,868 INFO L226 Difference]: Without dead ends: 13 [2018-11-22 22:12:51,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-22 22:12:51,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-22 22:12:51,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-22 22:12:51,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-22 22:12:51,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-22 22:12:51,897 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-22 22:12:51,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:51,897 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-22 22:12:51,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-22 22:12:51,897 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-22 22:12:51,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-22 22:12:51,898 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:51,898 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:51,898 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:51,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:51,898 INFO L82 PathProgramCache]: Analyzing trace with hash 563077882, now seen corresponding path program 1 times [2018-11-22 22:12:51,899 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:51,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:51,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,900 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:51,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:51,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:12:51,930 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:12:51,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-22 22:12:51,930 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-22 22:12:51,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-22 22:12:51,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-22 22:12:51,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-22 22:12:51,932 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2018-11-22 22:12:51,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:51,966 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2018-11-22 22:12:51,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-22 22:12:51,967 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2018-11-22 22:12:51,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:51,967 INFO L225 Difference]: With dead ends: 22 [2018-11-22 22:12:51,967 INFO L226 Difference]: Without dead ends: 17 [2018-11-22 22:12:51,968 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-22 22:12:51,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-11-22 22:12:51,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-11-22 22:12:51,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-22 22:12:51,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-11-22 22:12:51,971 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2018-11-22 22:12:51,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:51,971 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-11-22 22:12:51,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-22 22:12:51,972 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-11-22 22:12:51,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-22 22:12:51,972 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:51,972 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:51,972 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:51,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:51,973 INFO L82 PathProgramCache]: Analyzing trace with hash 620336184, now seen corresponding path program 1 times [2018-11-22 22:12:51,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:51,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,974 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:51,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:51,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:51,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:51,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:12:51,994 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:12:51,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-22 22:12:51,994 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-22 22:12:51,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-22 22:12:51,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-22 22:12:51,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-22 22:12:51,995 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2018-11-22 22:12:52,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:52,005 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2018-11-22 22:12:52,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-22 22:12:52,006 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2018-11-22 22:12:52,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:52,006 INFO L225 Difference]: With dead ends: 32 [2018-11-22 22:12:52,006 INFO L226 Difference]: Without dead ends: 20 [2018-11-22 22:12:52,007 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-22 22:12:52,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-22 22:12:52,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2018-11-22 22:12:52,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-22 22:12:52,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-11-22 22:12:52,009 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2018-11-22 22:12:52,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:52,010 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-11-22 22:12:52,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-22 22:12:52,010 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-11-22 22:12:52,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-22 22:12:52,010 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:52,010 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:52,011 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:52,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,011 INFO L82 PathProgramCache]: Analyzing trace with hash -657196198, now seen corresponding path program 1 times [2018-11-22 22:12:52,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:52,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:52,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,012 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:52,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,038 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,038 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:52,039 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-22 22:12:52,040 INFO L202 CegarAbsIntRunner]: [0], [4], [13], [16], [18], [22], [24], [31], [34], [36], [42], [43], [44], [46] [2018-11-22 22:12:52,059 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-22 22:12:52,059 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-22 22:12:52,150 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-22 22:12:52,150 INFO L272 AbstractInterpreter]: Visited 14 different actions 24 times. Merged at 3 different actions 6 times. Never widened. Performed 54 root evaluator evaluations with a maximum evaluation depth of 4. Performed 54 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 2 fixpoints after 2 different actions. Largest state had 5 variables. [2018-11-22 22:12:52,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-22 22:12:52,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,156 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:52,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:52,162 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:52,190 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:52,232 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:52,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-22 22:12:52,247 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:52,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-22 22:12:52,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-22 22:12:52,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-22 22:12:52,248 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2018-11-22 22:12:52,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:52,265 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-11-22 22:12:52,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-22 22:12:52,266 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-11-22 22:12:52,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:52,266 INFO L225 Difference]: With dead ends: 35 [2018-11-22 22:12:52,267 INFO L226 Difference]: Without dead ends: 23 [2018-11-22 22:12:52,267 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-22 22:12:52,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-11-22 22:12:52,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-11-22 22:12:52,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-22 22:12:52,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-11-22 22:12:52,270 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 18 [2018-11-22 22:12:52,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:52,270 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-11-22 22:12:52,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-22 22:12:52,270 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-11-22 22:12:52,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-22 22:12:52,271 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:52,271 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:52,271 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:52,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1550672957, now seen corresponding path program 2 times [2018-11-22 22:12:52,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:52,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:52,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,272 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:52,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,310 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:52,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:52,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:52,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:52,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:52,323 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:52,333 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-22 22:12:52,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:52,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:52,359 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:12:52,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:52,418 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-22 22:12:52,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:52,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 10 [2018-11-22 22:12:52,433 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:52,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-22 22:12:52,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-22 22:12:52,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-22 22:12:52,434 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2018-11-22 22:12:52,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:52,452 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2018-11-22 22:12:52,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-22 22:12:52,452 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2018-11-22 22:12:52,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:52,453 INFO L225 Difference]: With dead ends: 41 [2018-11-22 22:12:52,453 INFO L226 Difference]: Without dead ends: 29 [2018-11-22 22:12:52,454 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-22 22:12:52,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-22 22:12:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2018-11-22 22:12:52,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-22 22:12:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-11-22 22:12:52,457 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2018-11-22 22:12:52,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:52,458 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-11-22 22:12:52,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-22 22:12:52,458 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-11-22 22:12:52,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-22 22:12:52,458 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:52,459 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:52,459 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:52,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,459 INFO L82 PathProgramCache]: Analyzing trace with hash -755753187, now seen corresponding path program 3 times [2018-11-22 22:12:52,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:52,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,460 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:52,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,460 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:52,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,508 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,508 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:52,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:52,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:52,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:52,520 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:52,520 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:52,533 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:52,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:52,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:52,539 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:52,607 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:52,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-22 22:12:52,623 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:52,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-22 22:12:52,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-22 22:12:52,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-22 22:12:52,623 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 7 states. [2018-11-22 22:12:52,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:52,638 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2018-11-22 22:12:52,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-22 22:12:52,639 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2018-11-22 22:12:52,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:52,639 INFO L225 Difference]: With dead ends: 44 [2018-11-22 22:12:52,639 INFO L226 Difference]: Without dead ends: 32 [2018-11-22 22:12:52,639 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-22 22:12:52,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-22 22:12:52,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2018-11-22 22:12:52,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-11-22 22:12:52,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-11-22 22:12:52,642 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-11-22 22:12:52,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:52,642 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-11-22 22:12:52,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-22 22:12:52,642 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-11-22 22:12:52,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-11-22 22:12:52,643 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:52,643 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:52,643 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:52,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1097923174, now seen corresponding path program 4 times [2018-11-22 22:12:52,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:52,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,644 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:52,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:52,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,701 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 22 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,701 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:52,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:52,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:52,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,702 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:52,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:52,710 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:52,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:52,725 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 22 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:52,812 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 22 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:52,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-22 22:12:52,837 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:52,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-22 22:12:52,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-22 22:12:52,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-11-22 22:12:52,838 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 8 states. [2018-11-22 22:12:52,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:52,879 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2018-11-22 22:12:52,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-22 22:12:52,880 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2018-11-22 22:12:52,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:52,880 INFO L225 Difference]: With dead ends: 47 [2018-11-22 22:12:52,880 INFO L226 Difference]: Without dead ends: 35 [2018-11-22 22:12:52,880 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-11-22 22:12:52,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-11-22 22:12:52,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-11-22 22:12:52,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-22 22:12:52,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2018-11-22 22:12:52,884 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 30 [2018-11-22 22:12:52,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:52,885 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2018-11-22 22:12:52,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-22 22:12:52,885 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2018-11-22 22:12:52,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-22 22:12:52,885 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:52,886 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:52,886 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:52,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:52,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1568354813, now seen corresponding path program 5 times [2018-11-22 22:12:52,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:52,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:52,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:52,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:52,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:52,955 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 26 proven. 57 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-22 22:12:52,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,955 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:52,956 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:52,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:52,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:52,956 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:52,962 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:52,962 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:52,971 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-22 22:12:52,971 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:52,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:52,998 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 57 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-22 22:12:52,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:53,026 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 57 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-22 22:12:53,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:53,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 12 [2018-11-22 22:12:53,041 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:53,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-22 22:12:53,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-22 22:12:53,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2018-11-22 22:12:53,042 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 12 states. [2018-11-22 22:12:53,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:53,144 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2018-11-22 22:12:53,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-22 22:12:53,144 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2018-11-22 22:12:53,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:53,145 INFO L225 Difference]: With dead ends: 57 [2018-11-22 22:12:53,145 INFO L226 Difference]: Without dead ends: 45 [2018-11-22 22:12:53,145 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 60 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=145, Invalid=275, Unknown=0, NotChecked=0, Total=420 [2018-11-22 22:12:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-22 22:12:53,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2018-11-22 22:12:53,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-22 22:12:53,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-11-22 22:12:53,149 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 33 [2018-11-22 22:12:53,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:53,149 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-11-22 22:12:53,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-22 22:12:53,150 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-11-22 22:12:53,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-22 22:12:53,150 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:53,150 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:53,151 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:53,151 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:53,151 INFO L82 PathProgramCache]: Analyzing trace with hash 801367963, now seen corresponding path program 6 times [2018-11-22 22:12:53,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:53,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,152 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:53,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,152 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:53,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:53,212 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 53 proven. 77 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,212 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:53,212 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:53,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:53,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,212 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:53,218 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:53,218 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:53,232 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:53,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:53,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:53,242 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 53 proven. 77 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 53 proven. 77 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:53,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-22 22:12:53,344 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:53,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-22 22:12:53,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-22 22:12:53,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-22 22:12:53,345 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 10 states. [2018-11-22 22:12:53,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:53,364 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-11-22 22:12:53,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-22 22:12:53,364 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2018-11-22 22:12:53,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:53,365 INFO L225 Difference]: With dead ends: 59 [2018-11-22 22:12:53,365 INFO L226 Difference]: Without dead ends: 44 [2018-11-22 22:12:53,366 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-22 22:12:53,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-22 22:12:53,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2018-11-22 22:12:53,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-22 22:12:53,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-11-22 22:12:53,369 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 39 [2018-11-22 22:12:53,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:53,369 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-11-22 22:12:53,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-22 22:12:53,369 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-11-22 22:12:53,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-22 22:12:53,370 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:53,370 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:53,370 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:53,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:53,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1305478504, now seen corresponding path program 7 times [2018-11-22 22:12:53,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:53,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:53,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:53,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:53,426 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 60 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:53,427 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:53,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:53,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:53,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:53,433 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:53,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:53,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:53,455 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 60 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:53,561 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 60 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:53,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-22 22:12:53,579 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:53,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-22 22:12:53,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-22 22:12:53,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-11-22 22:12:53,580 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 11 states. [2018-11-22 22:12:53,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:53,604 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2018-11-22 22:12:53,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-22 22:12:53,604 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2018-11-22 22:12:53,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:53,605 INFO L225 Difference]: With dead ends: 62 [2018-11-22 22:12:53,605 INFO L226 Difference]: Without dead ends: 47 [2018-11-22 22:12:53,606 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-11-22 22:12:53,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-11-22 22:12:53,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2018-11-22 22:12:53,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-22 22:12:53,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-11-22 22:12:53,612 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 42 [2018-11-22 22:12:53,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:53,612 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-11-22 22:12:53,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-22 22:12:53,612 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-11-22 22:12:53,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-11-22 22:12:53,613 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:53,613 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:53,614 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:53,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:53,614 INFO L82 PathProgramCache]: Analyzing trace with hash 283486843, now seen corresponding path program 8 times [2018-11-22 22:12:53,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:53,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,615 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:53,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,615 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:53,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:53,692 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 67 proven. 126 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-22 22:12:53,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,693 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:53,694 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:53,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:53,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:53,694 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:53,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:53,705 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:53,716 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-22 22:12:53,716 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:53,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 130 proven. 17 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:53,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:53,807 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 130 proven. 17 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:53,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:53,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6, 6] total 16 [2018-11-22 22:12:53,822 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:53,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-22 22:12:53,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-22 22:12:53,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2018-11-22 22:12:53,823 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 16 states. [2018-11-22 22:12:53,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:53,912 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2018-11-22 22:12:53,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-22 22:12:53,913 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2018-11-22 22:12:53,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:53,914 INFO L225 Difference]: With dead ends: 75 [2018-11-22 22:12:53,914 INFO L226 Difference]: Without dead ends: 60 [2018-11-22 22:12:53,914 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 81 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-11-22 22:12:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-22 22:12:53,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 52. [2018-11-22 22:12:53,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-22 22:12:53,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2018-11-22 22:12:53,919 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 45 [2018-11-22 22:12:53,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:53,919 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2018-11-22 22:12:53,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-22 22:12:53,919 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2018-11-22 22:12:53,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-22 22:12:53,920 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:53,920 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:53,920 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:53,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:53,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1264097757, now seen corresponding path program 9 times [2018-11-22 22:12:53,920 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:53,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,921 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:53,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:53,921 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:54,001 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 106 proven. 155 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:54,002 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:54,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:54,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:54,010 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:54,010 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:54,024 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:54,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:54,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:54,034 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 106 proven. 155 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 106 proven. 155 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:54,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-22 22:12:54,202 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:54,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-22 22:12:54,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-22 22:12:54,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-22 22:12:54,203 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 13 states. [2018-11-22 22:12:54,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:54,221 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2018-11-22 22:12:54,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-22 22:12:54,222 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2018-11-22 22:12:54,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:54,222 INFO L225 Difference]: With dead ends: 74 [2018-11-22 22:12:54,222 INFO L226 Difference]: Without dead ends: 56 [2018-11-22 22:12:54,223 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-22 22:12:54,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-11-22 22:12:54,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2018-11-22 22:12:54,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-22 22:12:54,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2018-11-22 22:12:54,228 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2018-11-22 22:12:54,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:54,228 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2018-11-22 22:12:54,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-22 22:12:54,228 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2018-11-22 22:12:54,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-11-22 22:12:54,229 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:54,229 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:54,229 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:54,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:54,229 INFO L82 PathProgramCache]: Analyzing trace with hash 2042042714, now seen corresponding path program 10 times [2018-11-22 22:12:54,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:54,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:54,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,230 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:54,308 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 116 proven. 187 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:54,308 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:54,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:54,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:54,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:54,315 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:54,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:54,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:54,338 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 116 proven. 187 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:54,509 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 116 proven. 187 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:54,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-22 22:12:54,523 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:54,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-22 22:12:54,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-22 22:12:54,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-11-22 22:12:54,524 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 14 states. [2018-11-22 22:12:54,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:54,544 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2018-11-22 22:12:54,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-22 22:12:54,544 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2018-11-22 22:12:54,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:54,544 INFO L225 Difference]: With dead ends: 77 [2018-11-22 22:12:54,545 INFO L226 Difference]: Without dead ends: 59 [2018-11-22 22:12:54,545 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-11-22 22:12:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-11-22 22:12:54,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2018-11-22 22:12:54,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-11-22 22:12:54,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2018-11-22 22:12:54,549 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 54 [2018-11-22 22:12:54,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:54,550 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2018-11-22 22:12:54,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-22 22:12:54,550 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2018-11-22 22:12:54,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-11-22 22:12:54,550 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:54,550 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:54,551 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:54,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:54,551 INFO L82 PathProgramCache]: Analyzing trace with hash -2138239811, now seen corresponding path program 11 times [2018-11-22 22:12:54,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:54,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:54,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,552 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:54,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:54,639 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 126 proven. 222 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-22 22:12:54,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:54,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:54,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:54,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:54,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:54,652 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:54,652 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:54,672 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-22 22:12:54,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:54,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:54,714 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 233 proven. 34 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2018-11-22 22:12:54,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:54,775 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 233 proven. 34 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2018-11-22 22:12:54,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:54,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7, 7] total 20 [2018-11-22 22:12:54,790 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:54,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-22 22:12:54,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-22 22:12:54,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2018-11-22 22:12:54,790 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 20 states. [2018-11-22 22:12:54,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:54,941 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2018-11-22 22:12:54,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-22 22:12:54,942 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2018-11-22 22:12:54,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:54,942 INFO L225 Difference]: With dead ends: 93 [2018-11-22 22:12:54,942 INFO L226 Difference]: Without dead ends: 75 [2018-11-22 22:12:54,943 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 102 SyntacticMatches, 8 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=417, Invalid=915, Unknown=0, NotChecked=0, Total=1332 [2018-11-22 22:12:54,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-22 22:12:54,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 64. [2018-11-22 22:12:54,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-11-22 22:12:54,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2018-11-22 22:12:54,948 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 57 [2018-11-22 22:12:54,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:54,949 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2018-11-22 22:12:54,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-22 22:12:54,949 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2018-11-22 22:12:54,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-11-22 22:12:54,951 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:54,951 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:54,951 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:54,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:54,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1471912923, now seen corresponding path program 12 times [2018-11-22 22:12:54,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:54,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:54,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:54,952 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:54,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:55,085 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 177 proven. 260 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,085 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:55,085 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:55,085 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:55,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,085 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:55,092 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:55,093 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:55,110 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:55,110 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:55,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:55,119 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 177 proven. 260 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:55,287 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 177 proven. 260 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:55,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-22 22:12:55,302 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:55,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-22 22:12:55,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-22 22:12:55,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-22 22:12:55,302 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 16 states. [2018-11-22 22:12:55,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:55,339 INFO L93 Difference]: Finished difference Result 89 states and 100 transitions. [2018-11-22 22:12:55,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-22 22:12:55,339 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2018-11-22 22:12:55,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:55,340 INFO L225 Difference]: With dead ends: 89 [2018-11-22 22:12:55,340 INFO L226 Difference]: Without dead ends: 68 [2018-11-22 22:12:55,340 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-22 22:12:55,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-11-22 22:12:55,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2018-11-22 22:12:55,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-22 22:12:55,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-11-22 22:12:55,344 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 63 [2018-11-22 22:12:55,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:55,344 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-11-22 22:12:55,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-22 22:12:55,345 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-11-22 22:12:55,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-11-22 22:12:55,345 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:55,345 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:55,345 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:55,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:55,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1598932952, now seen corresponding path program 13 times [2018-11-22 22:12:55,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:55,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:55,346 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:55,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:55,346 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:55,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:55,461 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 190 proven. 301 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:55,461 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:55,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:55,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,462 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:55,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:55,471 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:55,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:55,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:55,488 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 190 proven. 301 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:55,704 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 190 proven. 301 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:55,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-22 22:12:55,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:55,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-22 22:12:55,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-22 22:12:55,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-11-22 22:12:55,729 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 17 states. [2018-11-22 22:12:55,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:55,762 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2018-11-22 22:12:55,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-22 22:12:55,769 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 66 [2018-11-22 22:12:55,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:55,770 INFO L225 Difference]: With dead ends: 92 [2018-11-22 22:12:55,770 INFO L226 Difference]: Without dead ends: 71 [2018-11-22 22:12:55,770 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-11-22 22:12:55,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-11-22 22:12:55,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-11-22 22:12:55,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-22 22:12:55,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2018-11-22 22:12:55,776 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 66 [2018-11-22 22:12:55,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:55,776 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2018-11-22 22:12:55,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-22 22:12:55,776 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2018-11-22 22:12:55,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-22 22:12:55,777 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:55,777 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:55,778 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:55,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:55,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1786429115, now seen corresponding path program 14 times [2018-11-22 22:12:55,778 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:55,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:55,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:55,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:55,779 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:55,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:55,879 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 203 proven. 345 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-22 22:12:55,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,879 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:55,879 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:55,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:55,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:55,880 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:55,885 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:55,885 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:55,898 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-22 22:12:55,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:55,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:55,976 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 366 proven. 57 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2018-11-22 22:12:55,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:56,046 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 366 proven. 57 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2018-11-22 22:12:56,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:56,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8, 8] total 24 [2018-11-22 22:12:56,061 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:56,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-22 22:12:56,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-22 22:12:56,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=372, Unknown=0, NotChecked=0, Total=552 [2018-11-22 22:12:56,062 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand 24 states. [2018-11-22 22:12:56,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:56,224 INFO L93 Difference]: Finished difference Result 111 states and 128 transitions. [2018-11-22 22:12:56,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-22 22:12:56,229 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2018-11-22 22:12:56,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:56,230 INFO L225 Difference]: With dead ends: 111 [2018-11-22 22:12:56,230 INFO L226 Difference]: Without dead ends: 90 [2018-11-22 22:12:56,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 123 SyntacticMatches, 10 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=604, Invalid=1376, Unknown=0, NotChecked=0, Total=1980 [2018-11-22 22:12:56,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-22 22:12:56,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 76. [2018-11-22 22:12:56,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-22 22:12:56,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-11-22 22:12:56,236 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2018-11-22 22:12:56,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:56,236 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-11-22 22:12:56,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-22 22:12:56,236 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-11-22 22:12:56,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-11-22 22:12:56,236 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:56,237 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:56,237 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:56,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:56,237 INFO L82 PathProgramCache]: Analyzing trace with hash 679355549, now seen corresponding path program 15 times [2018-11-22 22:12:56,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:56,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:56,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:56,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:56,238 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:56,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:56,381 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 266 proven. 392 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:56,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:56,381 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:56,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:56,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:56,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:56,382 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/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 [2018-11-22 22:12:56,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:56,394 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:56,412 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:56,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:56,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:56,427 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 266 proven. 392 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:56,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:56,679 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 266 proven. 392 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:56,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:56,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-22 22:12:56,695 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:56,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-22 22:12:56,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-22 22:12:56,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-22 22:12:56,696 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 19 states. [2018-11-22 22:12:56,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:56,726 INFO L93 Difference]: Finished difference Result 104 states and 117 transitions. [2018-11-22 22:12:56,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-22 22:12:56,727 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-11-22 22:12:56,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:56,728 INFO L225 Difference]: With dead ends: 104 [2018-11-22 22:12:56,728 INFO L226 Difference]: Without dead ends: 80 [2018-11-22 22:12:56,728 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-22 22:12:56,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-11-22 22:12:56,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2018-11-22 22:12:56,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-22 22:12:56,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2018-11-22 22:12:56,733 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 75 [2018-11-22 22:12:56,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:56,733 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2018-11-22 22:12:56,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-22 22:12:56,733 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2018-11-22 22:12:56,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-22 22:12:56,734 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:56,734 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:56,734 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:56,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:56,734 INFO L82 PathProgramCache]: Analyzing trace with hash 514145562, now seen corresponding path program 16 times [2018-11-22 22:12:56,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:56,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:56,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:56,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:56,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:56,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:56,837 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 282 proven. 442 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:56,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:56,838 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:56,838 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:56,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:56,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:56,838 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:56,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:56,844 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:56,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:56,858 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:56,864 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 282 proven. 442 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:56,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:57,140 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 282 proven. 442 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:57,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:57,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-22 22:12:57,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:57,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-22 22:12:57,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-22 22:12:57,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-11-22 22:12:57,156 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand 20 states. [2018-11-22 22:12:57,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:57,181 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2018-11-22 22:12:57,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-22 22:12:57,181 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 78 [2018-11-22 22:12:57,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:57,182 INFO L225 Difference]: With dead ends: 107 [2018-11-22 22:12:57,182 INFO L226 Difference]: Without dead ends: 83 [2018-11-22 22:12:57,182 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-11-22 22:12:57,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-11-22 22:12:57,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2018-11-22 22:12:57,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-11-22 22:12:57,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2018-11-22 22:12:57,187 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 78 [2018-11-22 22:12:57,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:57,187 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2018-11-22 22:12:57,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-22 22:12:57,187 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2018-11-22 22:12:57,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-22 22:12:57,188 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:57,188 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:57,188 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:57,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:57,189 INFO L82 PathProgramCache]: Analyzing trace with hash 775944061, now seen corresponding path program 17 times [2018-11-22 22:12:57,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:57,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:57,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:57,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:57,190 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:57,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:57,325 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 298 proven. 495 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-11-22 22:12:57,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:57,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:57,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:57,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:57,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:57,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:57,332 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:57,333 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:57,366 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-22 22:12:57,366 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:57,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:57,443 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 529 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-11-22 22:12:57,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:57,529 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 529 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-11-22 22:12:57,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:57,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 9, 9] total 28 [2018-11-22 22:12:57,543 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:57,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-22 22:12:57,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-22 22:12:57,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=511, Unknown=0, NotChecked=0, Total=756 [2018-11-22 22:12:57,544 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand 28 states. [2018-11-22 22:12:57,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:57,756 INFO L93 Difference]: Finished difference Result 129 states and 149 transitions. [2018-11-22 22:12:57,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-22 22:12:57,756 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2018-11-22 22:12:57,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:57,757 INFO L225 Difference]: With dead ends: 129 [2018-11-22 22:12:57,757 INFO L226 Difference]: Without dead ends: 105 [2018-11-22 22:12:57,757 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 144 SyntacticMatches, 12 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=825, Invalid=1931, Unknown=0, NotChecked=0, Total=2756 [2018-11-22 22:12:57,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-22 22:12:57,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 88. [2018-11-22 22:12:57,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-22 22:12:57,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2018-11-22 22:12:57,760 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 81 [2018-11-22 22:12:57,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:57,760 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2018-11-22 22:12:57,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-22 22:12:57,760 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2018-11-22 22:12:57,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-22 22:12:57,761 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:57,761 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 19, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:57,761 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:57,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:57,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1028866075, now seen corresponding path program 18 times [2018-11-22 22:12:57,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:57,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:57,762 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:57,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:57,762 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:57,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:57,895 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 373 proven. 551 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:57,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:57,896 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:57,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:57,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:57,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:57,896 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:57,903 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:57,903 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:57,916 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:57,916 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:57,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:57,924 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 373 proven. 551 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:57,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:58,198 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 373 proven. 551 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:58,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:58,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-22 22:12:58,213 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:58,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-22 22:12:58,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-22 22:12:58,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-22 22:12:58,214 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand 22 states. [2018-11-22 22:12:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:58,248 INFO L93 Difference]: Finished difference Result 119 states and 134 transitions. [2018-11-22 22:12:58,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-22 22:12:58,249 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 87 [2018-11-22 22:12:58,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:58,250 INFO L225 Difference]: With dead ends: 119 [2018-11-22 22:12:58,250 INFO L226 Difference]: Without dead ends: 92 [2018-11-22 22:12:58,250 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-22 22:12:58,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-11-22 22:12:58,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2018-11-22 22:12:58,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-11-22 22:12:58,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-11-22 22:12:58,254 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 87 [2018-11-22 22:12:58,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:58,254 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-11-22 22:12:58,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-22 22:12:58,254 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-11-22 22:12:58,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-11-22 22:12:58,255 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:58,255 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 20, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:58,255 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:58,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:58,255 INFO L82 PathProgramCache]: Analyzing trace with hash -275741416, now seen corresponding path program 19 times [2018-11-22 22:12:58,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:58,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:58,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:58,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:58,256 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:58,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:58,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 392 proven. 610 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:58,393 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:58,393 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:58,394 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:58,394 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:58,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:58,394 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:58,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:58,400 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:12:58,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:58,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:58,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 392 proven. 610 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:58,433 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:58,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 392 proven. 610 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:58,764 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:58,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-22 22:12:58,764 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:58,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-22 22:12:58,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-22 22:12:58,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-11-22 22:12:58,765 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 23 states. [2018-11-22 22:12:58,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:58,797 INFO L93 Difference]: Finished difference Result 122 states and 137 transitions. [2018-11-22 22:12:58,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-22 22:12:58,799 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 90 [2018-11-22 22:12:58,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:58,799 INFO L225 Difference]: With dead ends: 122 [2018-11-22 22:12:58,799 INFO L226 Difference]: Without dead ends: 95 [2018-11-22 22:12:58,800 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-11-22 22:12:58,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-11-22 22:12:58,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2018-11-22 22:12:58,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-11-22 22:12:58,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2018-11-22 22:12:58,804 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 90 [2018-11-22 22:12:58,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:58,805 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2018-11-22 22:12:58,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-22 22:12:58,805 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2018-11-22 22:12:58,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-11-22 22:12:58,805 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:58,805 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 21, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:58,805 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:58,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:58,805 INFO L82 PathProgramCache]: Analyzing trace with hash -678444293, now seen corresponding path program 20 times [2018-11-22 22:12:58,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:58,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:58,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:12:58,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:58,806 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:58,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:58,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 411 proven. 672 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-22 22:12:58,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:58,999 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:58,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:59,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:59,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:59,000 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:59,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:12:59,009 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:12:59,036 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-22 22:12:59,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:59,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 722 proven. 121 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2018-11-22 22:12:59,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:12:59,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 722 proven. 121 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2018-11-22 22:12:59,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:12:59,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 10, 10] total 32 [2018-11-22 22:12:59,288 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:12:59,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-22 22:12:59,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-22 22:12:59,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=672, Unknown=0, NotChecked=0, Total=992 [2018-11-22 22:12:59,289 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2018-11-22 22:12:59,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:12:59,558 INFO L93 Difference]: Finished difference Result 147 states and 170 transitions. [2018-11-22 22:12:59,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-22 22:12:59,559 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2018-11-22 22:12:59,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:12:59,559 INFO L225 Difference]: With dead ends: 147 [2018-11-22 22:12:59,559 INFO L226 Difference]: Without dead ends: 120 [2018-11-22 22:12:59,560 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 165 SyntacticMatches, 14 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1080, Invalid=2580, Unknown=0, NotChecked=0, Total=3660 [2018-11-22 22:12:59,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-22 22:12:59,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 100. [2018-11-22 22:12:59,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-11-22 22:12:59,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2018-11-22 22:12:59,564 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 93 [2018-11-22 22:12:59,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:12:59,564 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2018-11-22 22:12:59,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-22 22:12:59,564 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2018-11-22 22:12:59,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-22 22:12:59,564 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:12:59,564 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 22, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:12:59,565 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:12:59,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:12:59,565 INFO L82 PathProgramCache]: Analyzing trace with hash 2063122269, now seen corresponding path program 21 times [2018-11-22 22:12:59,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:12:59,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:59,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:12:59,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:12:59,565 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:12:59,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:12:59,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 498 proven. 737 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:12:59,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:59,741 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:12:59,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:12:59,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:12:59,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:12:59,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:12:59,748 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:12:59,749 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:12:59,764 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:12:59,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:12:59,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:12:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 498 proven. 737 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:12:59,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:00,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 498 proven. 737 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:13:00,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:00,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-22 22:13:00,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:00,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-22 22:13:00,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-22 22:13:00,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-22 22:13:00,156 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand 25 states. [2018-11-22 22:13:00,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:00,192 INFO L93 Difference]: Finished difference Result 134 states and 151 transitions. [2018-11-22 22:13:00,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-22 22:13:00,192 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 99 [2018-11-22 22:13:00,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:00,192 INFO L225 Difference]: With dead ends: 134 [2018-11-22 22:13:00,193 INFO L226 Difference]: Without dead ends: 104 [2018-11-22 22:13:00,193 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-22 22:13:00,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-11-22 22:13:00,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2018-11-22 22:13:00,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-11-22 22:13:00,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2018-11-22 22:13:00,196 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 99 [2018-11-22 22:13:00,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:00,196 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2018-11-22 22:13:00,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-22 22:13:00,197 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2018-11-22 22:13:00,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-11-22 22:13:00,197 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:00,197 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:00,197 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:00,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:00,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1055748314, now seen corresponding path program 22 times [2018-11-22 22:13:00,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:00,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:00,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:00,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:00,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:00,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:00,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 520 proven. 805 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:13:00,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:00,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:00,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:00,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:00,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:00,376 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:00,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:00,382 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:00,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:00,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:00,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 520 proven. 805 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:13:00,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:00,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 520 proven. 805 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:13:00,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:00,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-22 22:13:00,829 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:00,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-22 22:13:00,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-22 22:13:00,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-11-22 22:13:00,829 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand 26 states. [2018-11-22 22:13:00,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:00,862 INFO L93 Difference]: Finished difference Result 137 states and 154 transitions. [2018-11-22 22:13:00,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-22 22:13:00,862 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 102 [2018-11-22 22:13:00,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:00,863 INFO L225 Difference]: With dead ends: 137 [2018-11-22 22:13:00,863 INFO L226 Difference]: Without dead ends: 107 [2018-11-22 22:13:00,863 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-11-22 22:13:00,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-11-22 22:13:00,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2018-11-22 22:13:00,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-22 22:13:00,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2018-11-22 22:13:00,867 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 102 [2018-11-22 22:13:00,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:00,867 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2018-11-22 22:13:00,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-22 22:13:00,868 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2018-11-22 22:13:00,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-22 22:13:00,868 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:00,868 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:00,868 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:00,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:00,869 INFO L82 PathProgramCache]: Analyzing trace with hash -685247939, now seen corresponding path program 23 times [2018-11-22 22:13:00,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:00,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:00,869 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:00,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:00,869 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:00,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:01,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 542 proven. 876 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2018-11-22 22:13:01,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:01,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:01,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:01,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:01,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:01,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:01,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:01,078 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:01,099 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-22 22:13:01,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:01,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:01,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 945 proven. 162 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2018-11-22 22:13:01,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:01,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 945 proven. 162 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2018-11-22 22:13:01,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:01,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 11, 11] total 36 [2018-11-22 22:13:01,351 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:01,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-22 22:13:01,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-22 22:13:01,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=855, Unknown=0, NotChecked=0, Total=1260 [2018-11-22 22:13:01,352 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand 36 states. [2018-11-22 22:13:01,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:01,639 INFO L93 Difference]: Finished difference Result 165 states and 191 transitions. [2018-11-22 22:13:01,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-22 22:13:01,639 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2018-11-22 22:13:01,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:01,639 INFO L225 Difference]: With dead ends: 165 [2018-11-22 22:13:01,639 INFO L226 Difference]: Without dead ends: 135 [2018-11-22 22:13:01,640 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 186 SyntacticMatches, 16 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1233 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1369, Invalid=3323, Unknown=0, NotChecked=0, Total=4692 [2018-11-22 22:13:01,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-22 22:13:01,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 112. [2018-11-22 22:13:01,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-11-22 22:13:01,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2018-11-22 22:13:01,645 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 105 [2018-11-22 22:13:01,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:01,645 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2018-11-22 22:13:01,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-22 22:13:01,645 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2018-11-22 22:13:01,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-11-22 22:13:01,645 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:01,645 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 25, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:01,646 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:01,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:01,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1450628187, now seen corresponding path program 24 times [2018-11-22 22:13:01,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:01,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:01,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:01,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:01,647 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:01,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:01,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 641 proven. 950 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:01,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:01,846 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:01,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:01,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:01,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:01,846 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:01,853 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:01,853 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:01,872 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:01,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:01,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:01,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 641 proven. 950 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:01,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:02,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 641 proven. 950 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:02,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:02,400 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2018-11-22 22:13:02,400 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:02,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-22 22:13:02,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-22 22:13:02,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:02,401 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand 28 states. [2018-11-22 22:13:02,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:02,466 INFO L93 Difference]: Finished difference Result 149 states and 168 transitions. [2018-11-22 22:13:02,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-22 22:13:02,466 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 111 [2018-11-22 22:13:02,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:02,467 INFO L225 Difference]: With dead ends: 149 [2018-11-22 22:13:02,467 INFO L226 Difference]: Without dead ends: 116 [2018-11-22 22:13:02,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 197 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:02,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-11-22 22:13:02,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2018-11-22 22:13:02,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-22 22:13:02,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-22 22:13:02,475 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 111 [2018-11-22 22:13:02,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:02,475 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-22 22:13:02,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-22 22:13:02,476 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-22 22:13:02,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-22 22:13:02,476 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:02,476 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 26, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:02,476 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:02,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:02,477 INFO L82 PathProgramCache]: Analyzing trace with hash -639356328, now seen corresponding path program 25 times [2018-11-22 22:13:02,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:02,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:02,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:02,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:02,478 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:02,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:02,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 666 proven. 1027 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:02,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:02,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:02,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:02,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:02,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:02,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:02,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:02,729 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:02,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:02,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:02,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 666 proven. 1027 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:02,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:03,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 666 proven. 1027 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:03,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:03,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 52 [2018-11-22 22:13:03,273 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:03,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-22 22:13:03,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-22 22:13:03,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:03,273 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 29 states. [2018-11-22 22:13:03,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:03,324 INFO L93 Difference]: Finished difference Result 152 states and 171 transitions. [2018-11-22 22:13:03,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-22 22:13:03,324 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 114 [2018-11-22 22:13:03,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:03,325 INFO L225 Difference]: With dead ends: 152 [2018-11-22 22:13:03,325 INFO L226 Difference]: Without dead ends: 119 [2018-11-22 22:13:03,326 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 202 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:03,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-11-22 22:13:03,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2018-11-22 22:13:03,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-11-22 22:13:03,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2018-11-22 22:13:03,333 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 114 [2018-11-22 22:13:03,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:03,333 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2018-11-22 22:13:03,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-22 22:13:03,333 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2018-11-22 22:13:03,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-11-22 22:13:03,334 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:03,334 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 27, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:03,334 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:03,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:03,335 INFO L82 PathProgramCache]: Analyzing trace with hash 772847419, now seen corresponding path program 26 times [2018-11-22 22:13:03,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:03,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:03,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:03,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:03,335 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:03,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:03,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 691 proven. 1107 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-11-22 22:13:03,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:03,560 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:03,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:03,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:03,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:03,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:03,568 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:03,568 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:03,597 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-22 22:13:03,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:03,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:03,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1198 proven. 209 refuted. 0 times theorem prover too weak. 483 trivial. 0 not checked. [2018-11-22 22:13:03,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:03,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1198 proven. 209 refuted. 0 times theorem prover too weak. 483 trivial. 0 not checked. [2018-11-22 22:13:03,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:03,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 12, 12] total 40 [2018-11-22 22:13:03,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:03,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-22 22:13:03,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-22 22:13:03,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=1060, Unknown=0, NotChecked=0, Total=1560 [2018-11-22 22:13:03,920 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand 40 states. [2018-11-22 22:13:04,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:04,292 INFO L93 Difference]: Finished difference Result 183 states and 212 transitions. [2018-11-22 22:13:04,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-22 22:13:04,293 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2018-11-22 22:13:04,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:04,294 INFO L225 Difference]: With dead ends: 183 [2018-11-22 22:13:04,294 INFO L226 Difference]: Without dead ends: 150 [2018-11-22 22:13:04,295 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 207 SyntacticMatches, 18 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1558 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1692, Invalid=4160, Unknown=0, NotChecked=0, Total=5852 [2018-11-22 22:13:04,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-11-22 22:13:04,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 124. [2018-11-22 22:13:04,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-11-22 22:13:04,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 134 transitions. [2018-11-22 22:13:04,302 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 134 transitions. Word has length 117 [2018-11-22 22:13:04,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:04,302 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 134 transitions. [2018-11-22 22:13:04,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-22 22:13:04,302 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 134 transitions. [2018-11-22 22:13:04,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-22 22:13:04,302 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:04,303 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 28, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:04,303 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:04,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:04,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1269011939, now seen corresponding path program 27 times [2018-11-22 22:13:04,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:04,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:04,304 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:04,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:04,304 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:04,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:04,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 802 proven. 1190 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:04,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:04,553 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:04,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:04,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:04,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:04,553 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:04,561 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:04,561 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:04,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:04,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:04,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 802 proven. 1190 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:04,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:05,063 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 802 proven. 1190 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:05,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:05,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 52 [2018-11-22 22:13:05,082 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:05,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-22 22:13:05,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-22 22:13:05,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:05,083 INFO L87 Difference]: Start difference. First operand 124 states and 134 transitions. Second operand 31 states. [2018-11-22 22:13:05,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:05,137 INFO L93 Difference]: Finished difference Result 164 states and 185 transitions. [2018-11-22 22:13:05,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-22 22:13:05,138 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 123 [2018-11-22 22:13:05,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:05,139 INFO L225 Difference]: With dead ends: 164 [2018-11-22 22:13:05,139 INFO L226 Difference]: Without dead ends: 128 [2018-11-22 22:13:05,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 218 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:05,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-11-22 22:13:05,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2018-11-22 22:13:05,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-11-22 22:13:05,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2018-11-22 22:13:05,148 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 123 [2018-11-22 22:13:05,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:05,148 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2018-11-22 22:13:05,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-22 22:13:05,148 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2018-11-22 22:13:05,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-11-22 22:13:05,149 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:05,149 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 29, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:05,149 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:05,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:05,150 INFO L82 PathProgramCache]: Analyzing trace with hash -853298022, now seen corresponding path program 28 times [2018-11-22 22:13:05,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:05,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:05,150 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:05,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:05,151 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:05,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:05,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 830 proven. 1276 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:05,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:05,456 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:05,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:05,456 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:05,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:05,456 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:05,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:05,470 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:05,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:05,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:05,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 830 proven. 1276 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:05,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:05,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 830 proven. 1276 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:05,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:05,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2018-11-22 22:13:05,991 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:05,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-22 22:13:05,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-22 22:13:05,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:05,992 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand 32 states. [2018-11-22 22:13:06,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:06,046 INFO L93 Difference]: Finished difference Result 167 states and 188 transitions. [2018-11-22 22:13:06,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-22 22:13:06,047 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 126 [2018-11-22 22:13:06,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:06,047 INFO L225 Difference]: With dead ends: 167 [2018-11-22 22:13:06,047 INFO L226 Difference]: Without dead ends: 131 [2018-11-22 22:13:06,048 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 223 SyntacticMatches, 10 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:06,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2018-11-22 22:13:06,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2018-11-22 22:13:06,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-11-22 22:13:06,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 140 transitions. [2018-11-22 22:13:06,054 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 140 transitions. Word has length 126 [2018-11-22 22:13:06,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:06,054 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 140 transitions. [2018-11-22 22:13:06,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-22 22:13:06,054 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 140 transitions. [2018-11-22 22:13:06,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-22 22:13:06,054 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:06,054 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 30, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:06,054 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:06,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:06,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1289288957, now seen corresponding path program 29 times [2018-11-22 22:13:06,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:06,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:06,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:06,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:06,055 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:06,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 858 proven. 1365 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2018-11-22 22:13:06,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:06,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:06,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:06,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:06,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:06,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:06,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:06,322 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:06,353 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-22 22:13:06,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:06,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:06,490 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1481 proven. 262 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2018-11-22 22:13:06,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:06,716 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1481 proven. 262 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2018-11-22 22:13:06,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:06,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 13, 13] total 44 [2018-11-22 22:13:06,731 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:06,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-22 22:13:06,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-22 22:13:06,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1287, Unknown=0, NotChecked=0, Total=1892 [2018-11-22 22:13:06,732 INFO L87 Difference]: Start difference. First operand 130 states and 140 transitions. Second operand 44 states. [2018-11-22 22:13:07,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:07,105 INFO L93 Difference]: Finished difference Result 201 states and 233 transitions. [2018-11-22 22:13:07,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-22 22:13:07,105 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2018-11-22 22:13:07,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:07,106 INFO L225 Difference]: With dead ends: 201 [2018-11-22 22:13:07,106 INFO L226 Difference]: Without dead ends: 165 [2018-11-22 22:13:07,107 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 228 SyntacticMatches, 20 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1921 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=2049, Invalid=5091, Unknown=0, NotChecked=0, Total=7140 [2018-11-22 22:13:07,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-11-22 22:13:07,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 136. [2018-11-22 22:13:07,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-11-22 22:13:07,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 147 transitions. [2018-11-22 22:13:07,114 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 147 transitions. Word has length 129 [2018-11-22 22:13:07,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:07,114 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 147 transitions. [2018-11-22 22:13:07,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-22 22:13:07,114 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 147 transitions. [2018-11-22 22:13:07,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-11-22 22:13:07,114 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:07,115 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 31, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:07,115 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:07,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:07,115 INFO L82 PathProgramCache]: Analyzing trace with hash 403855515, now seen corresponding path program 30 times [2018-11-22 22:13:07,115 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:07,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:07,116 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:07,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:07,116 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:07,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:07,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 981 proven. 1457 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:07,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:07,395 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:07,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:07,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:07,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:07,395 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:07,401 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:07,402 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:07,421 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:07,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:07,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:07,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 981 proven. 1457 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:07,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:07,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 981 proven. 1457 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:07,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:07,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2018-11-22 22:13:07,943 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:07,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-22 22:13:07,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-22 22:13:07,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:07,944 INFO L87 Difference]: Start difference. First operand 136 states and 147 transitions. Second operand 34 states. [2018-11-22 22:13:07,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:07,996 INFO L93 Difference]: Finished difference Result 179 states and 202 transitions. [2018-11-22 22:13:07,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-22 22:13:07,997 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 135 [2018-11-22 22:13:07,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:07,997 INFO L225 Difference]: With dead ends: 179 [2018-11-22 22:13:07,997 INFO L226 Difference]: Without dead ends: 140 [2018-11-22 22:13:07,998 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 239 SyntacticMatches, 14 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:07,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-11-22 22:13:08,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2018-11-22 22:13:08,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-11-22 22:13:08,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-11-22 22:13:08,004 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 135 [2018-11-22 22:13:08,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:08,004 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-11-22 22:13:08,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-22 22:13:08,004 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-11-22 22:13:08,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-11-22 22:13:08,004 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:08,004 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 32, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:08,005 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:08,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:08,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1808478312, now seen corresponding path program 31 times [2018-11-22 22:13:08,005 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:08,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:08,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:08,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:08,005 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:08,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1012 proven. 1552 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:08,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:08,368 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:08,368 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:08,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:08,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:08,369 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:08,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:08,374 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:08,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:08,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:08,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1012 proven. 1552 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:08,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1012 proven. 1552 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:08,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:08,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-11-22 22:13:08,999 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:08,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-22 22:13:08,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-22 22:13:08,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:09,000 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 35 states. [2018-11-22 22:13:09,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:09,075 INFO L93 Difference]: Finished difference Result 182 states and 205 transitions. [2018-11-22 22:13:09,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-22 22:13:09,076 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 138 [2018-11-22 22:13:09,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:09,077 INFO L225 Difference]: With dead ends: 182 [2018-11-22 22:13:09,077 INFO L226 Difference]: Without dead ends: 143 [2018-11-22 22:13:09,077 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 244 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:09,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-11-22 22:13:09,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2018-11-22 22:13:09,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-22 22:13:09,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 153 transitions. [2018-11-22 22:13:09,084 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 153 transitions. Word has length 138 [2018-11-22 22:13:09,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:09,084 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 153 transitions. [2018-11-22 22:13:09,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-22 22:13:09,085 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 153 transitions. [2018-11-22 22:13:09,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-11-22 22:13:09,085 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:09,085 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 33, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:09,085 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:09,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:09,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1122605947, now seen corresponding path program 32 times [2018-11-22 22:13:09,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:09,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:09,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:09,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:09,086 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:09,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:09,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1043 proven. 1650 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2018-11-22 22:13:09,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:09,434 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:09,434 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:09,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:09,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:09,435 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:09,458 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:09,458 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:09,531 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-22 22:13:09,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:09,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:09,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1794 proven. 321 refuted. 0 times theorem prover too weak. 723 trivial. 0 not checked. [2018-11-22 22:13:09,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:09,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1794 proven. 321 refuted. 0 times theorem prover too weak. 723 trivial. 0 not checked. [2018-11-22 22:13:09,954 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:09,954 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 14, 14] total 48 [2018-11-22 22:13:09,954 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:09,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-22 22:13:09,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-22 22:13:09,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=1536, Unknown=0, NotChecked=0, Total=2256 [2018-11-22 22:13:09,955 INFO L87 Difference]: Start difference. First operand 142 states and 153 transitions. Second operand 48 states. [2018-11-22 22:13:10,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:10,400 INFO L93 Difference]: Finished difference Result 219 states and 254 transitions. [2018-11-22 22:13:10,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-22 22:13:10,400 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 141 [2018-11-22 22:13:10,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:10,400 INFO L225 Difference]: With dead ends: 219 [2018-11-22 22:13:10,401 INFO L226 Difference]: Without dead ends: 180 [2018-11-22 22:13:10,401 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 249 SyntacticMatches, 22 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2322 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2440, Invalid=6116, Unknown=0, NotChecked=0, Total=8556 [2018-11-22 22:13:10,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-11-22 22:13:10,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 148. [2018-11-22 22:13:10,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-11-22 22:13:10,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 160 transitions. [2018-11-22 22:13:10,414 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 160 transitions. Word has length 141 [2018-11-22 22:13:10,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:10,414 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 160 transitions. [2018-11-22 22:13:10,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-22 22:13:10,415 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 160 transitions. [2018-11-22 22:13:10,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-11-22 22:13:10,415 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:10,415 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 34, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:10,415 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:10,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:10,416 INFO L82 PathProgramCache]: Analyzing trace with hash -415423267, now seen corresponding path program 33 times [2018-11-22 22:13:10,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:10,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:10,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:10,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:10,417 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:10,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:10,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 1178 proven. 1751 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:10,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:10,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:10,747 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:10,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:10,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:10,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:10,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:10,754 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:10,779 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:10,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:10,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:10,801 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 1178 proven. 1751 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:10,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:11,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 1178 proven. 1751 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:11,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:11,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 52 [2018-11-22 22:13:11,339 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:11,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-22 22:13:11,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-22 22:13:11,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:11,340 INFO L87 Difference]: Start difference. First operand 148 states and 160 transitions. Second operand 37 states. [2018-11-22 22:13:11,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:11,420 INFO L93 Difference]: Finished difference Result 194 states and 219 transitions. [2018-11-22 22:13:11,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-22 22:13:11,421 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 147 [2018-11-22 22:13:11,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:11,422 INFO L225 Difference]: With dead ends: 194 [2018-11-22 22:13:11,422 INFO L226 Difference]: Without dead ends: 152 [2018-11-22 22:13:11,422 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 260 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:11,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-11-22 22:13:11,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2018-11-22 22:13:11,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-22 22:13:11,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 163 transitions. [2018-11-22 22:13:11,434 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 163 transitions. Word has length 147 [2018-11-22 22:13:11,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:11,435 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 163 transitions. [2018-11-22 22:13:11,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-22 22:13:11,435 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 163 transitions. [2018-11-22 22:13:11,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-22 22:13:11,436 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:11,436 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 35, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:11,436 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:11,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:11,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1557923930, now seen corresponding path program 34 times [2018-11-22 22:13:11,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:11,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:11,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:11,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:11,437 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:11,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:11,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 1212 proven. 1855 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:11,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:11,865 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:11,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:11,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:11,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:11,866 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:11,875 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:11,875 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:11,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:11,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:11,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 1212 proven. 1855 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:11,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:12,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 1212 proven. 1855 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:12,794 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:12,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 52 [2018-11-22 22:13:12,794 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:12,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-22 22:13:12,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-22 22:13:12,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:12,795 INFO L87 Difference]: Start difference. First operand 151 states and 163 transitions. Second operand 38 states. [2018-11-22 22:13:12,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:12,861 INFO L93 Difference]: Finished difference Result 197 states and 222 transitions. [2018-11-22 22:13:12,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-22 22:13:12,862 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 150 [2018-11-22 22:13:12,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:12,862 INFO L225 Difference]: With dead ends: 197 [2018-11-22 22:13:12,862 INFO L226 Difference]: Without dead ends: 155 [2018-11-22 22:13:12,863 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 265 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:12,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-11-22 22:13:12,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2018-11-22 22:13:12,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-22 22:13:12,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-22 22:13:12,875 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 150 [2018-11-22 22:13:12,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:12,876 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-22 22:13:12,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-22 22:13:12,876 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-22 22:13:12,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-11-22 22:13:12,876 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:12,877 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 36, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:12,877 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:12,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:12,877 INFO L82 PathProgramCache]: Analyzing trace with hash 31922109, now seen corresponding path program 35 times [2018-11-22 22:13:12,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:12,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:12,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:12,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:12,878 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:12,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:13,354 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 1246 proven. 1962 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2018-11-22 22:13:13,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:13,354 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:13,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:13,354 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:13,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:13,354 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:13,364 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:13,364 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:13,414 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-22 22:13:13,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:13,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:13,648 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2137 proven. 386 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-11-22 22:13:13,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:13,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2137 proven. 386 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-11-22 22:13:13,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:13,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 15, 15] total 52 [2018-11-22 22:13:13,975 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:13,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-22 22:13:13,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-22 22:13:13,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=845, Invalid=1807, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:13,976 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 52 states. [2018-11-22 22:13:14,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:14,473 INFO L93 Difference]: Finished difference Result 237 states and 275 transitions. [2018-11-22 22:13:14,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-22 22:13:14,474 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 153 [2018-11-22 22:13:14,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:14,474 INFO L225 Difference]: With dead ends: 237 [2018-11-22 22:13:14,474 INFO L226 Difference]: Without dead ends: 195 [2018-11-22 22:13:14,475 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 270 SyntacticMatches, 24 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2761 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2865, Invalid=7235, Unknown=0, NotChecked=0, Total=10100 [2018-11-22 22:13:14,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-11-22 22:13:14,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 160. [2018-11-22 22:13:14,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-22 22:13:14,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 173 transitions. [2018-11-22 22:13:14,490 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 173 transitions. Word has length 153 [2018-11-22 22:13:14,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:14,490 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 173 transitions. [2018-11-22 22:13:14,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-22 22:13:14,490 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 173 transitions. [2018-11-22 22:13:14,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-22 22:13:14,491 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:14,491 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 37, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:14,491 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:14,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:14,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1240347429, now seen corresponding path program 36 times [2018-11-22 22:13:14,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:14,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:14,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:14,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:14,492 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:14,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:14,948 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 1393 proven. 2072 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:14,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:14,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:14,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:14,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:14,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:14,949 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:14,956 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:14,957 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:14,993 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:14,993 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:14,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:15,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 1393 proven. 2072 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:15,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:15,581 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 1393 proven. 2072 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:15,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:15,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-11-22 22:13:15,596 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:15,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-22 22:13:15,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-22 22:13:15,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:15,597 INFO L87 Difference]: Start difference. First operand 160 states and 173 transitions. Second operand 40 states. [2018-11-22 22:13:15,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:15,658 INFO L93 Difference]: Finished difference Result 209 states and 236 transitions. [2018-11-22 22:13:15,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-22 22:13:15,659 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2018-11-22 22:13:15,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:15,660 INFO L225 Difference]: With dead ends: 209 [2018-11-22 22:13:15,660 INFO L226 Difference]: Without dead ends: 164 [2018-11-22 22:13:15,660 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 281 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:15,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-11-22 22:13:15,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2018-11-22 22:13:15,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-11-22 22:13:15,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 176 transitions. [2018-11-22 22:13:15,672 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 176 transitions. Word has length 159 [2018-11-22 22:13:15,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:15,672 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 176 transitions. [2018-11-22 22:13:15,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-22 22:13:15,673 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 176 transitions. [2018-11-22 22:13:15,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-11-22 22:13:15,673 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:15,674 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 38, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:15,674 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:15,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:15,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1399741656, now seen corresponding path program 37 times [2018-11-22 22:13:15,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:15,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:15,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:15,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:15,675 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:15,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:16,139 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 1430 proven. 2185 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:16,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:16,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:16,139 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:16,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:16,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:16,139 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:16,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:16,146 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:16,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:16,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:16,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 1430 proven. 2185 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:16,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:16,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 1430 proven. 2185 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:16,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:16,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 52 [2018-11-22 22:13:16,766 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:16,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-22 22:13:16,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-22 22:13:16,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:16,767 INFO L87 Difference]: Start difference. First operand 163 states and 176 transitions. Second operand 41 states. [2018-11-22 22:13:16,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:16,837 INFO L93 Difference]: Finished difference Result 212 states and 239 transitions. [2018-11-22 22:13:16,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-22 22:13:16,838 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 162 [2018-11-22 22:13:16,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:16,839 INFO L225 Difference]: With dead ends: 212 [2018-11-22 22:13:16,839 INFO L226 Difference]: Without dead ends: 167 [2018-11-22 22:13:16,839 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 286 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:16,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-11-22 22:13:16,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2018-11-22 22:13:16,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-11-22 22:13:16,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 179 transitions. [2018-11-22 22:13:16,847 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 179 transitions. Word has length 162 [2018-11-22 22:13:16,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:16,848 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 179 transitions. [2018-11-22 22:13:16,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-22 22:13:16,848 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 179 transitions. [2018-11-22 22:13:16,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-11-22 22:13:16,848 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:16,848 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 39, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:16,848 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:16,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:16,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1442418757, now seen corresponding path program 38 times [2018-11-22 22:13:16,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:16,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:16,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:16,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:16,849 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:16,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:17,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 1467 proven. 2301 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-22 22:13:17,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:17,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:17,342 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:17,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:17,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:17,342 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:17,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:17,351 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:17,403 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-11-22 22:13:17,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:17,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:17,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2510 proven. 457 refuted. 0 times theorem prover too weak. 1011 trivial. 0 not checked. [2018-11-22 22:13:17,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:17,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2510 proven. 457 refuted. 0 times theorem prover too weak. 1011 trivial. 0 not checked. [2018-11-22 22:13:17,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:17,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 16, 16] total 56 [2018-11-22 22:13:17,984 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:17,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-11-22 22:13:17,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-11-22 22:13:17,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=2100, Unknown=0, NotChecked=0, Total=3080 [2018-11-22 22:13:17,984 INFO L87 Difference]: Start difference. First operand 166 states and 179 transitions. Second operand 56 states. [2018-11-22 22:13:18,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:18,540 INFO L93 Difference]: Finished difference Result 255 states and 296 transitions. [2018-11-22 22:13:18,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-22 22:13:18,540 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 165 [2018-11-22 22:13:18,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:18,541 INFO L225 Difference]: With dead ends: 255 [2018-11-22 22:13:18,541 INFO L226 Difference]: Without dead ends: 210 [2018-11-22 22:13:18,542 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 291 SyntacticMatches, 26 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3238 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=3324, Invalid=8448, Unknown=0, NotChecked=0, Total=11772 [2018-11-22 22:13:18,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2018-11-22 22:13:18,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 172. [2018-11-22 22:13:18,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-11-22 22:13:18,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 186 transitions. [2018-11-22 22:13:18,556 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 186 transitions. Word has length 165 [2018-11-22 22:13:18,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:18,556 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 186 transitions. [2018-11-22 22:13:18,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-11-22 22:13:18,556 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 186 transitions. [2018-11-22 22:13:18,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-11-22 22:13:18,557 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:18,557 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 40, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:18,557 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:18,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:18,557 INFO L82 PathProgramCache]: Analyzing trace with hash 120516509, now seen corresponding path program 39 times [2018-11-22 22:13:18,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:18,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:18,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:18,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:18,558 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:18,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:19,011 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 1626 proven. 2420 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:19,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:19,011 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:19,011 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:19,011 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:19,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:19,011 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:19,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:19,017 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:19,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:19,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:19,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:19,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 1626 proven. 2420 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:19,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:19,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 1626 proven. 2420 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:19,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:19,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 52 [2018-11-22 22:13:19,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:19,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-22 22:13:19,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-22 22:13:19,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:19,645 INFO L87 Difference]: Start difference. First operand 172 states and 186 transitions. Second operand 43 states. [2018-11-22 22:13:19,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:19,711 INFO L93 Difference]: Finished difference Result 224 states and 253 transitions. [2018-11-22 22:13:19,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-22 22:13:19,711 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 171 [2018-11-22 22:13:19,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:19,712 INFO L225 Difference]: With dead ends: 224 [2018-11-22 22:13:19,712 INFO L226 Difference]: Without dead ends: 176 [2018-11-22 22:13:19,712 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 302 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:19,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2018-11-22 22:13:19,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2018-11-22 22:13:19,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-11-22 22:13:19,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 189 transitions. [2018-11-22 22:13:19,729 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 189 transitions. Word has length 171 [2018-11-22 22:13:19,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:19,729 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 189 transitions. [2018-11-22 22:13:19,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-22 22:13:19,729 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 189 transitions. [2018-11-22 22:13:19,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-11-22 22:13:19,730 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:19,730 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 41, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:19,730 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:19,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:19,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1655335962, now seen corresponding path program 40 times [2018-11-22 22:13:19,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:19,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:19,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:19,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:19,731 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:19,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:20,257 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 1666 proven. 2542 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:20,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:20,258 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:20,258 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:20,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:20,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:20,258 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:20,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:20,265 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:20,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:20,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:20,307 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 1666 proven. 2542 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:20,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:20,966 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 1666 proven. 2542 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:20,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:20,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 52 [2018-11-22 22:13:20,983 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:20,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-22 22:13:20,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-22 22:13:20,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:20,984 INFO L87 Difference]: Start difference. First operand 175 states and 189 transitions. Second operand 44 states. [2018-11-22 22:13:21,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:21,069 INFO L93 Difference]: Finished difference Result 227 states and 256 transitions. [2018-11-22 22:13:21,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-22 22:13:21,070 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 174 [2018-11-22 22:13:21,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:21,070 INFO L225 Difference]: With dead ends: 227 [2018-11-22 22:13:21,070 INFO L226 Difference]: Without dead ends: 179 [2018-11-22 22:13:21,071 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 307 SyntacticMatches, 34 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:21,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-11-22 22:13:21,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2018-11-22 22:13:21,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-22 22:13:21,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 192 transitions. [2018-11-22 22:13:21,091 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 192 transitions. Word has length 174 [2018-11-22 22:13:21,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:21,091 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 192 transitions. [2018-11-22 22:13:21,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-22 22:13:21,092 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 192 transitions. [2018-11-22 22:13:21,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-22 22:13:21,092 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:21,092 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 42, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:21,092 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:21,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:21,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1239827069, now seen corresponding path program 41 times [2018-11-22 22:13:21,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:21,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:21,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:21,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:21,094 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:21,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:21,547 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 1706 proven. 2667 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-11-22 22:13:21,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:21,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:21,547 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:21,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:21,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:21,547 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:21,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:21,554 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:21,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-11-22 22:13:21,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:21,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:21,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 2913 proven. 534 refuted. 0 times theorem prover too weak. 1173 trivial. 0 not checked. [2018-11-22 22:13:21,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:22,310 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 2913 proven. 534 refuted. 0 times theorem prover too weak. 1173 trivial. 0 not checked. [2018-11-22 22:13:22,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:22,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 17, 17] total 60 [2018-11-22 22:13:22,327 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:22,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-11-22 22:13:22,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-11-22 22:13:22,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=2415, Unknown=0, NotChecked=0, Total=3540 [2018-11-22 22:13:22,328 INFO L87 Difference]: Start difference. First operand 178 states and 192 transitions. Second operand 60 states. [2018-11-22 22:13:23,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:23,119 INFO L93 Difference]: Finished difference Result 273 states and 317 transitions. [2018-11-22 22:13:23,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-11-22 22:13:23,119 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 177 [2018-11-22 22:13:23,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:23,120 INFO L225 Difference]: With dead ends: 273 [2018-11-22 22:13:23,120 INFO L226 Difference]: Without dead ends: 225 [2018-11-22 22:13:23,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 312 SyntacticMatches, 28 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3753 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3817, Invalid=9755, Unknown=0, NotChecked=0, Total=13572 [2018-11-22 22:13:23,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-11-22 22:13:23,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 184. [2018-11-22 22:13:23,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-11-22 22:13:23,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 199 transitions. [2018-11-22 22:13:23,136 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 199 transitions. Word has length 177 [2018-11-22 22:13:23,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:23,136 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 199 transitions. [2018-11-22 22:13:23,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-11-22 22:13:23,136 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 199 transitions. [2018-11-22 22:13:23,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-11-22 22:13:23,137 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:23,137 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 43, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:23,137 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:23,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:23,137 INFO L82 PathProgramCache]: Analyzing trace with hash -480169701, now seen corresponding path program 42 times [2018-11-22 22:13:23,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:23,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:23,138 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:23,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:23,138 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:23,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:23,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 1877 proven. 2795 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:23,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:23,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:23,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:23,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:23,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:23,736 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:23,746 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:23,746 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:23,778 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:23,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:23,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:23,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 1877 proven. 2795 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:23,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:24,455 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 1877 proven. 2795 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:24,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:24,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 52 [2018-11-22 22:13:24,471 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:24,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-22 22:13:24,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-22 22:13:24,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:24,472 INFO L87 Difference]: Start difference. First operand 184 states and 199 transitions. Second operand 46 states. [2018-11-22 22:13:24,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:24,556 INFO L93 Difference]: Finished difference Result 239 states and 270 transitions. [2018-11-22 22:13:24,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-22 22:13:24,556 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 183 [2018-11-22 22:13:24,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:24,557 INFO L225 Difference]: With dead ends: 239 [2018-11-22 22:13:24,557 INFO L226 Difference]: Without dead ends: 188 [2018-11-22 22:13:24,557 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 323 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:24,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-11-22 22:13:24,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2018-11-22 22:13:24,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-22 22:13:24,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 202 transitions. [2018-11-22 22:13:24,572 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 202 transitions. Word has length 183 [2018-11-22 22:13:24,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:24,572 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 202 transitions. [2018-11-22 22:13:24,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-22 22:13:24,572 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 202 transitions. [2018-11-22 22:13:24,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-22 22:13:24,573 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:24,573 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 44, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:24,573 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:24,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:24,573 INFO L82 PathProgramCache]: Analyzing trace with hash -881010152, now seen corresponding path program 43 times [2018-11-22 22:13:24,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:24,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:24,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:24,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:24,574 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:24,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:25,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 1920 proven. 2926 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:25,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:25,176 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:25,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:25,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:25,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:25,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:25,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:25,191 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:25,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:25,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:25,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 1920 proven. 2926 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:25,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 1920 proven. 2926 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:25,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:25,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 52 [2018-11-22 22:13:25,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:25,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-22 22:13:25,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-22 22:13:25,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:25,962 INFO L87 Difference]: Start difference. First operand 187 states and 202 transitions. Second operand 47 states. [2018-11-22 22:13:26,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:26,032 INFO L93 Difference]: Finished difference Result 242 states and 273 transitions. [2018-11-22 22:13:26,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-22 22:13:26,032 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 186 [2018-11-22 22:13:26,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:26,032 INFO L225 Difference]: With dead ends: 242 [2018-11-22 22:13:26,032 INFO L226 Difference]: Without dead ends: 191 [2018-11-22 22:13:26,033 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 328 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:26,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2018-11-22 22:13:26,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2018-11-22 22:13:26,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-11-22 22:13:26,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 205 transitions. [2018-11-22 22:13:26,045 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 205 transitions. Word has length 186 [2018-11-22 22:13:26,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:26,045 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 205 transitions. [2018-11-22 22:13:26,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-22 22:13:26,045 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 205 transitions. [2018-11-22 22:13:26,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-11-22 22:13:26,046 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:26,046 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 45, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:26,046 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:26,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:26,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1985164283, now seen corresponding path program 44 times [2018-11-22 22:13:26,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:26,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:26,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:26,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:26,047 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:26,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:26,581 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 1963 proven. 3060 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2018-11-22 22:13:26,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:26,581 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:26,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:26,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:26,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:26,582 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:26,588 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:26,589 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:26,639 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-11-22 22:13:26,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:26,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:26,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3346 proven. 617 refuted. 0 times theorem prover too weak. 1347 trivial. 0 not checked. [2018-11-22 22:13:26,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:27,378 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3346 proven. 617 refuted. 0 times theorem prover too weak. 1347 trivial. 0 not checked. [2018-11-22 22:13:27,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:27,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 18, 18] total 64 [2018-11-22 22:13:27,393 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:27,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-22 22:13:27,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-22 22:13:27,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=2752, Unknown=0, NotChecked=0, Total=4032 [2018-11-22 22:13:27,394 INFO L87 Difference]: Start difference. First operand 190 states and 205 transitions. Second operand 64 states. [2018-11-22 22:13:28,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:28,227 INFO L93 Difference]: Finished difference Result 291 states and 338 transitions. [2018-11-22 22:13:28,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-11-22 22:13:28,229 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 189 [2018-11-22 22:13:28,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:28,230 INFO L225 Difference]: With dead ends: 291 [2018-11-22 22:13:28,230 INFO L226 Difference]: Without dead ends: 240 [2018-11-22 22:13:28,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 333 SyntacticMatches, 30 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4306 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=4344, Invalid=11156, Unknown=0, NotChecked=0, Total=15500 [2018-11-22 22:13:28,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-11-22 22:13:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 196. [2018-11-22 22:13:28,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-22 22:13:28,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 212 transitions. [2018-11-22 22:13:28,246 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 212 transitions. Word has length 189 [2018-11-22 22:13:28,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:28,246 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 212 transitions. [2018-11-22 22:13:28,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-22 22:13:28,246 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 212 transitions. [2018-11-22 22:13:28,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-22 22:13:28,247 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:28,247 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 46, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:28,247 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:28,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:28,248 INFO L82 PathProgramCache]: Analyzing trace with hash 684051037, now seen corresponding path program 45 times [2018-11-22 22:13:28,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:28,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:28,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:28,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:28,248 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:28,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 2146 proven. 3197 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:28,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:28,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:28,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:28,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:28,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:28,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:28,866 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:28,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:28,893 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:28,893 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:28,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:28,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 2146 proven. 3197 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:28,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:29,592 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 2146 proven. 3197 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:29,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:29,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2018-11-22 22:13:29,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:29,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-22 22:13:29,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-22 22:13:29,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:29,608 INFO L87 Difference]: Start difference. First operand 196 states and 212 transitions. Second operand 49 states. [2018-11-22 22:13:29,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:29,687 INFO L93 Difference]: Finished difference Result 254 states and 287 transitions. [2018-11-22 22:13:29,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-22 22:13:29,688 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 195 [2018-11-22 22:13:29,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:29,689 INFO L225 Difference]: With dead ends: 254 [2018-11-22 22:13:29,689 INFO L226 Difference]: Without dead ends: 200 [2018-11-22 22:13:29,689 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 344 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:29,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-11-22 22:13:29,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2018-11-22 22:13:29,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-11-22 22:13:29,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 215 transitions. [2018-11-22 22:13:29,705 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 215 transitions. Word has length 195 [2018-11-22 22:13:29,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:29,705 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 215 transitions. [2018-11-22 22:13:29,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-22 22:13:29,706 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 215 transitions. [2018-11-22 22:13:29,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-11-22 22:13:29,706 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:29,706 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 47, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:29,707 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:29,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:29,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1948442586, now seen corresponding path program 46 times [2018-11-22 22:13:29,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:29,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:29,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:29,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:29,708 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:29,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 2192 proven. 3337 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:30,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:30,288 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:30,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:30,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:30,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:30,289 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:30,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:30,297 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:30,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:30,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:30,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 2192 proven. 3337 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:30,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:30,928 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 2192 proven. 3337 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:30,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:30,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2018-11-22 22:13:30,943 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:30,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-22 22:13:30,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-22 22:13:30,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:30,944 INFO L87 Difference]: Start difference. First operand 199 states and 215 transitions. Second operand 50 states. [2018-11-22 22:13:31,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:31,037 INFO L93 Difference]: Finished difference Result 257 states and 290 transitions. [2018-11-22 22:13:31,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-22 22:13:31,037 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 198 [2018-11-22 22:13:31,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:31,038 INFO L225 Difference]: With dead ends: 257 [2018-11-22 22:13:31,038 INFO L226 Difference]: Without dead ends: 203 [2018-11-22 22:13:31,038 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 349 SyntacticMatches, 46 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:31,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-11-22 22:13:31,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2018-11-22 22:13:31,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-11-22 22:13:31,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 218 transitions. [2018-11-22 22:13:31,063 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 218 transitions. Word has length 198 [2018-11-22 22:13:31,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:31,064 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 218 transitions. [2018-11-22 22:13:31,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-22 22:13:31,064 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 218 transitions. [2018-11-22 22:13:31,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-11-22 22:13:31,065 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:31,065 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 48, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:31,065 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:31,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:31,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1721074371, now seen corresponding path program 47 times [2018-11-22 22:13:31,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:31,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:31,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:31,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:31,066 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:31,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:31,659 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 2238 proven. 3480 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-11-22 22:13:31,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:31,659 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:31,659 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:31,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:31,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:31,659 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:31,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:31,667 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:31,717 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-11-22 22:13:31,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:31,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:32,035 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 3809 proven. 706 refuted. 0 times theorem prover too weak. 1533 trivial. 0 not checked. [2018-11-22 22:13:32,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:32,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 3809 proven. 706 refuted. 0 times theorem prover too weak. 1533 trivial. 0 not checked. [2018-11-22 22:13:32,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:32,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 19, 19] total 68 [2018-11-22 22:13:32,566 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:32,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-11-22 22:13:32,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-11-22 22:13:32,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1445, Invalid=3111, Unknown=0, NotChecked=0, Total=4556 [2018-11-22 22:13:32,567 INFO L87 Difference]: Start difference. First operand 202 states and 218 transitions. Second operand 68 states. [2018-11-22 22:13:33,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:33,359 INFO L93 Difference]: Finished difference Result 309 states and 359 transitions. [2018-11-22 22:13:33,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-11-22 22:13:33,359 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 201 [2018-11-22 22:13:33,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:33,360 INFO L225 Difference]: With dead ends: 309 [2018-11-22 22:13:33,360 INFO L226 Difference]: Without dead ends: 255 [2018-11-22 22:13:33,361 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 354 SyntacticMatches, 32 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4897 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=4905, Invalid=12651, Unknown=0, NotChecked=0, Total=17556 [2018-11-22 22:13:33,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2018-11-22 22:13:33,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 208. [2018-11-22 22:13:33,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-11-22 22:13:33,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 225 transitions. [2018-11-22 22:13:33,380 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 225 transitions. Word has length 201 [2018-11-22 22:13:33,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:33,380 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 225 transitions. [2018-11-22 22:13:33,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-11-22 22:13:33,380 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 225 transitions. [2018-11-22 22:13:33,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-11-22 22:13:33,381 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:33,381 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 49, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:33,381 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:33,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:33,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1846770341, now seen corresponding path program 48 times [2018-11-22 22:13:33,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:33,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:33,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:33,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:33,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:33,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:33,988 INFO L134 CoverageAnalysis]: Checked inductivity of 6435 backedges. 2433 proven. 3626 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2018-11-22 22:13:33,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:33,988 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:33,988 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:33,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:33,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:33,988 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:33,996 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:33,996 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:34,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:34,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:34,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:34,058 INFO L134 CoverageAnalysis]: Checked inductivity of 6435 backedges. 2433 proven. 3626 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2018-11-22 22:13:34,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:34,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6435 backedges. 2433 proven. 3626 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2018-11-22 22:13:34,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:34,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 52 [2018-11-22 22:13:34,730 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:34,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-22 22:13:34,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-22 22:13:34,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:34,731 INFO L87 Difference]: Start difference. First operand 208 states and 225 transitions. Second operand 52 states. [2018-11-22 22:13:34,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:34,822 INFO L93 Difference]: Finished difference Result 283 states and 318 transitions. [2018-11-22 22:13:34,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-22 22:13:34,823 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 207 [2018-11-22 22:13:34,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:34,824 INFO L225 Difference]: With dead ends: 283 [2018-11-22 22:13:34,824 INFO L226 Difference]: Without dead ends: 226 [2018-11-22 22:13:34,825 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 365 SyntacticMatches, 50 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-22 22:13:34,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-11-22 22:13:34,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 211. [2018-11-22 22:13:34,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2018-11-22 22:13:34,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 228 transitions. [2018-11-22 22:13:34,844 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 228 transitions. Word has length 207 [2018-11-22 22:13:34,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:34,845 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 228 transitions. [2018-11-22 22:13:34,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-22 22:13:34,845 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 228 transitions. [2018-11-22 22:13:34,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2018-11-22 22:13:34,845 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:34,846 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 50, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:34,846 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:34,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:34,846 INFO L82 PathProgramCache]: Analyzing trace with hash -280213672, now seen corresponding path program 49 times [2018-11-22 22:13:34,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:34,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:34,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:34,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:34,847 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:34,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:35,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6633 backedges. 5783 proven. 801 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2018-11-22 22:13:35,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:35,576 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:35,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:35,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:35,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:35,576 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:35,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:35,583 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-22 22:13:35,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:35,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:35,642 INFO L134 CoverageAnalysis]: Checked inductivity of 6633 backedges. 5783 proven. 801 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2018-11-22 22:13:35,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:36,182 INFO L134 CoverageAnalysis]: Checked inductivity of 6633 backedges. 5783 proven. 801 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2018-11-22 22:13:36,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:36,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 86 [2018-11-22 22:13:36,197 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:36,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-22 22:13:36,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-22 22:13:36,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-11-22 22:13:36,198 INFO L87 Difference]: Start difference. First operand 211 states and 228 transitions. Second operand 53 states. [2018-11-22 22:13:37,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:37,132 INFO L93 Difference]: Finished difference Result 1984 states and 2612 transitions. [2018-11-22 22:13:37,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-22 22:13:37,133 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 210 [2018-11-22 22:13:37,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:37,137 INFO L225 Difference]: With dead ends: 1984 [2018-11-22 22:13:37,137 INFO L226 Difference]: Without dead ends: 1979 [2018-11-22 22:13:37,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 371 SyntacticMatches, 34 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4711 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-11-22 22:13:37,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1979 states. [2018-11-22 22:13:37,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1979 to 313. [2018-11-22 22:13:37,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-11-22 22:13:37,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 364 transitions. [2018-11-22 22:13:37,288 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 364 transitions. Word has length 210 [2018-11-22 22:13:37,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:37,288 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 364 transitions. [2018-11-22 22:13:37,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-22 22:13:37,288 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 364 transitions. [2018-11-22 22:13:37,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-11-22 22:13:37,290 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:37,290 INFO L402 BasicCegarLoop]: trace histogram [101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:37,290 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:37,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:37,290 INFO L82 PathProgramCache]: Analyzing trace with hash -644776136, now seen corresponding path program 50 times [2018-11-22 22:13:37,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:37,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:37,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-22 22:13:37,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:37,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:37,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:38,313 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 7648 proven. 3876 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-11-22 22:13:38,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:38,314 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:38,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:38,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:38,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:38,314 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:38,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-22 22:13:38,323 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-22 22:13:38,421 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2018-11-22 22:13:38,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:38,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:38,543 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 7648 proven. 3876 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-11-22 22:13:38,543 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:38,747 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 7648 proven. 3876 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-11-22 22:13:38,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:38,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 59 [2018-11-22 22:13:38,762 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:38,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-22 22:13:38,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-22 22:13:38,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3303, Unknown=0, NotChecked=0, Total=3422 [2018-11-22 22:13:38,763 INFO L87 Difference]: Start difference. First operand 313 states and 364 transitions. Second operand 57 states. [2018-11-22 22:13:42,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:42,614 INFO L93 Difference]: Finished difference Result 4398 states and 5825 transitions. [2018-11-22 22:13:42,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-22 22:13:42,614 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 312 [2018-11-22 22:13:42,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:42,622 INFO L225 Difference]: With dead ends: 4398 [2018-11-22 22:13:42,622 INFO L226 Difference]: Without dead ends: 4236 [2018-11-22 22:13:42,623 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 618 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=125, Invalid=3415, Unknown=0, NotChecked=0, Total=3540 [2018-11-22 22:13:42,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4236 states. [2018-11-22 22:13:45,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4236 to 4187. [2018-11-22 22:13:45,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4187 states. [2018-11-22 22:13:45,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4187 states to 4187 states and 4287 transitions. [2018-11-22 22:13:45,096 INFO L78 Accepts]: Start accepts. Automaton has 4187 states and 4287 transitions. Word has length 312 [2018-11-22 22:13:45,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:45,097 INFO L480 AbstractCegarLoop]: Abstraction has 4187 states and 4287 transitions. [2018-11-22 22:13:45,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-22 22:13:45,097 INFO L276 IsEmpty]: Start isEmpty. Operand 4187 states and 4287 transitions. [2018-11-22 22:13:45,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-11-22 22:13:45,097 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:45,098 INFO L402 BasicCegarLoop]: trace histogram [102, 101, 52, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:45,098 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:45,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:45,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1847249315, now seen corresponding path program 51 times [2018-11-22 22:13:45,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:45,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:45,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:45,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:45,098 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:45,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:45,868 INFO L134 CoverageAnalysis]: Checked inductivity of 15453 backedges. 7903 proven. 7401 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2018-11-22 22:13:45,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:45,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-22 22:13:45,868 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-22 22:13:45,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-22 22:13:45,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-22 22:13:45,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-22 22:13:45,878 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-22 22:13:45,878 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-22 22:13:45,926 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-22 22:13:45,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-22 22:13:45,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-22 22:13:46,028 INFO L134 CoverageAnalysis]: Checked inductivity of 15453 backedges. 7903 proven. 7401 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2018-11-22 22:13:46,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-22 22:13:47,268 INFO L134 CoverageAnalysis]: Checked inductivity of 15453 backedges. 7903 proven. 7401 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2018-11-22 22:13:47,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-22 22:13:47,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 54 [2018-11-22 22:13:47,283 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-22 22:13:47,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-22 22:13:47,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-22 22:13:47,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-22 22:13:47,283 INFO L87 Difference]: Start difference. First operand 4187 states and 4287 transitions. Second operand 54 states. [2018-11-22 22:13:49,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:49,918 INFO L93 Difference]: Finished difference Result 8374 states and 8575 transitions. [2018-11-22 22:13:49,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-22 22:13:49,919 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 315 [2018-11-22 22:13:49,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:49,924 INFO L225 Difference]: With dead ends: 8374 [2018-11-22 22:13:49,925 INFO L226 Difference]: Without dead ends: 4190 [2018-11-22 22:13:49,929 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 733 GetRequests, 579 SyntacticMatches, 102 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2950 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-22 22:13:49,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4190 states. [2018-11-22 22:13:52,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4190 to 4190. [2018-11-22 22:13:52,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4190 states. [2018-11-22 22:13:52,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4190 states to 4190 states and 4290 transitions. [2018-11-22 22:13:52,431 INFO L78 Accepts]: Start accepts. Automaton has 4190 states and 4290 transitions. Word has length 315 [2018-11-22 22:13:52,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:52,431 INFO L480 AbstractCegarLoop]: Abstraction has 4190 states and 4290 transitions. [2018-11-22 22:13:52,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-22 22:13:52,431 INFO L276 IsEmpty]: Start isEmpty. Operand 4190 states and 4290 transitions. [2018-11-22 22:13:52,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2018-11-22 22:13:52,433 INFO L394 BasicCegarLoop]: Found error trace [2018-11-22 22:13:52,433 INFO L402 BasicCegarLoop]: trace histogram [103, 102, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-22 22:13:52,433 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-22 22:13:52,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-22 22:13:52,433 INFO L82 PathProgramCache]: Analyzing trace with hash -973780774, now seen corresponding path program 52 times [2018-11-22 22:13:52,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-22 22:13:52,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:52,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-22 22:13:52,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-22 22:13:52,434 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-22 22:13:52,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-22 22:13:53,236 INFO L134 CoverageAnalysis]: Checked inductivity of 15759 backedges. 11729 proven. 0 refuted. 0 times theorem prover too weak. 4030 trivial. 0 not checked. [2018-11-22 22:13:53,236 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-22 22:13:53,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2018-11-22 22:13:53,236 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-22 22:13:53,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-22 22:13:53,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-22 22:13:53,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-22 22:13:53,237 INFO L87 Difference]: Start difference. First operand 4190 states and 4290 transitions. Second operand 53 states. [2018-11-22 22:13:53,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-22 22:13:53,393 INFO L93 Difference]: Finished difference Result 4190 states and 4290 transitions. [2018-11-22 22:13:53,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-22 22:13:53,393 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 318 [2018-11-22 22:13:53,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-22 22:13:53,394 INFO L225 Difference]: With dead ends: 4190 [2018-11-22 22:13:53,394 INFO L226 Difference]: Without dead ends: 0 [2018-11-22 22:13:53,397 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-22 22:13:53,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-22 22:13:53,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-22 22:13:53,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-22 22:13:53,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-22 22:13:53,398 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 318 [2018-11-22 22:13:53,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-22 22:13:53,398 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-22 22:13:53,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-22 22:13:53,398 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-22 22:13:53,398 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-22 22:13:53,405 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-22 22:13:56,287 WARN L180 SmtUtils]: Spent 2.87 s on a formula simplification. DAG size of input: 1495 DAG size of output: 1010 [2018-11-22 22:13:59,579 WARN L180 SmtUtils]: Spent 3.26 s on a formula simplification. DAG size of input: 879 DAG size of output: 509 [2018-11-22 22:13:59,584 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-22 22:13:59,584 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 10 25) the Hoare annotation is: true [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 10 25) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 19) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point L15-2(lines 14 22) no Hoare annotation was computed. [2018-11-22 22:13:59,584 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 10 25) no Hoare annotation was computed. [2018-11-22 22:13:59,586 INFO L444 ceAbstractionStarter]: At program point L14-2(lines 14 22) the Hoare annotation is: (let ((.cse15 (<= main_~y~0 28)) (.cse14 (<= 28 main_~y~0)) (.cse29 (<= 34 main_~y~0)) (.cse28 (<= main_~y~0 34)) (.cse41 (<= main_~y~0 32)) (.cse40 (<= 32 main_~y~0)) (.cse24 (<= main_~y~0 29)) (.cse25 (<= 29 main_~y~0)) (.cse20 (<= 26 main_~y~0)) (.cse21 (<= main_~y~0 26)) (.cse27 (<= main_~y~0 23)) (.cse26 (<= 23 main_~y~0)) (.cse3 (<= 9 main_~y~0)) (.cse2 (<= main_~y~0 9)) (.cse44 (<= main_~y~0 7)) (.cse45 (<= 7 main_~y~0)) (.cse56 (<= 0 main_~y~0)) (.cse57 (<= main_~y~0 0)) (.cse36 (<= 8 main_~y~0)) (.cse37 (<= main_~y~0 8)) (.cse12 (<= main_~y~0 21)) (.cse13 (<= 21 main_~y~0)) (.cse19 (<= main_~y~0 14)) (.cse18 (<= 14 main_~y~0)) (.cse53 (<= 24 main_~y~0)) (.cse52 (<= main_~y~0 24)) (.cse59 (<= 39 main_~y~0)) (.cse58 (<= main_~y~0 39)) (.cse70 (<= 5 main_~y~0)) (.cse71 (<= main_~y~0 5)) (.cse0 (<= main_~y~0 16)) (.cse1 (<= 16 main_~y~0)) (.cse50 (<= 25 main_~y~0)) (.cse51 (<= main_~y~0 25)) (.cse54 (<= main_~y~0 3)) (.cse55 (<= 3 main_~y~0)) (.cse8 (<= main_~y~0 6)) (.cse9 (<= 6 main_~y~0)) (.cse85 (<= main_~y~0 17)) (.cse84 (<= 17 main_~y~0)) (.cse88 (<= 46 main_~y~0)) (.cse89 (<= main_~y~0 46)) (.cse32 (<= 38 main_~y~0)) (.cse33 (<= main_~y~0 38)) (.cse92 (<= main_~y~0 2)) (.cse93 (<= 2 main_~y~0)) (.cse31 (<= main_~y~0 40)) (.cse30 (<= 40 main_~y~0)) (.cse48 (<= 19 main_~y~0)) (.cse49 (<= main_~y~0 19)) (.cse64 (<= main_~y~0 4)) (.cse65 (<= 4 main_~y~0)) (.cse69 (<= main_~y~0 33)) (.cse68 (<= 33 main_~y~0)) (.cse73 (<= 35 main_~y~0)) (.cse72 (<= main_~y~0 35)) (.cse16 (<= main_~y~0 42)) (.cse17 (<= 42 main_~y~0)) (.cse95 (<= main_~y~0 37)) (.cse94 (<= 37 main_~y~0)) (.cse6 (<= 1 main_~y~0)) (.cse7 (<= main_~y~0 1)) (.cse66 (<= main_~y~0 13)) (.cse67 (<= 13 main_~y~0)) (.cse61 (<= 43 main_~y~0)) (.cse60 (<= main_~y~0 43)) (.cse46 (<= 18 main_~y~0)) (.cse47 (<= main_~y~0 18)) (.cse10 (<= main_~y~0 41)) (.cse11 (<= 41 main_~y~0)) (.cse78 (<= 44 main_~y~0)) (.cse79 (<= main_~y~0 44)) (.cse98 (<= main_~y~0 36)) (.cse99 (<= 36 main_~y~0)) (.cse83 (<= main_~y~0 47)) (.cse82 (<= 47 main_~y~0)) (.cse87 (<= 20 main_~y~0)) (.cse86 (<= main_~y~0 20)) (.cse77 (<= main_~y~0 27)) (.cse76 (<= 27 main_~y~0)) (.cse39 (<= 11 main_~y~0)) (.cse38 (<= main_~y~0 11)) (.cse5 (<= main_~y~0 48)) (.cse4 (<= 48 main_~y~0)) (.cse42 (<= 30 main_~y~0)) (.cse43 (<= main_~y~0 30)) (.cse97 (<= main_~y~0 12)) (.cse96 (<= 12 main_~y~0)) (.cse34 (<= 22 main_~y~0)) (.cse35 (<= main_~y~0 22)) (.cse81 (<= main_~y~0 15)) (.cse80 (<= 15 main_~y~0)) (.cse90 (<= 31 main_~y~0)) (.cse91 (<= main_~y~0 31)) (.cse62 (<= main_~y~0 10)) (.cse63 (<= 10 main_~y~0)) (.cse22 (<= 49 main_~y~0)) (.cse23 (<= main_~y~0 49)) (.cse75 (<= main_~y~0 45)) (.cse74 (<= 45 main_~y~0))) (or (and .cse0 (<= 84 main_~x~0) .cse1 (<= main_~x~0 84)) (and (<= main_~x~0 91) (<= 91 main_~x~0) .cse2 .cse3) (and .cse4 .cse5 (<= main_~x~0 52) (<= 52 main_~x~0)) (and (<= main_~x~0 99) .cse6 .cse7 (<= 99 main_~x~0)) (and (<= 94 main_~x~0) .cse8 (<= main_~x~0 94) .cse9) (and .cse10 (<= main_~x~0 41) .cse11 (<= 41 main_~x~0)) (and (<= main_~x~0 21) .cse12 .cse13 (<= 21 main_~x~0)) (and (<= main_~x~0 28) .cse14 .cse15 (<= 28 main_~x~0)) (and (<= 58 main_~x~0) .cse16 (<= main_~x~0 58) .cse17) (and .cse15 (<= 72 main_~x~0) .cse14 (<= main_~x~0 72)) (and .cse18 (<= main_~x~0 86) .cse19 (<= 86 main_~x~0)) (and (<= main_~x~0 26) (<= 26 main_~x~0) .cse20 .cse21) (and .cse22 (<= main_~x~0 51) (<= 51 main_~x~0) .cse23) (and .cse24 (<= 29 main_~x~0) .cse25 (<= main_~x~0 29)) (and .cse26 (<= main_~x~0 23) .cse27 (<= 23 main_~x~0)) (and .cse28 (<= 66 main_~x~0) .cse29 (<= main_~x~0 66)) (and .cse30 (<= 40 main_~x~0) (<= main_~x~0 40) .cse31) (and .cse32 (<= main_~x~0 38) (<= 38 main_~x~0) .cse33) (and (<= 34 main_~x~0) (<= main_~x~0 34) .cse29 .cse28) (and (<= main_~x~0 22) (<= 22 main_~x~0) .cse34 .cse35) (and (<= main_~x~0 92) .cse36 .cse37 (<= 92 main_~x~0)) (and .cse38 (<= 89 main_~x~0) .cse39 (<= main_~x~0 89)) (and (<= 68 main_~x~0) .cse40 (<= main_~x~0 68) .cse41) (and .cse42 (<= 30 main_~x~0) (<= main_~x~0 30) .cse43) (and .cse44 (<= main_~x~0 7) .cse45 (<= 7 main_~x~0)) (and .cse46 (<= main_~x~0 18) (<= 18 main_~x~0) .cse47) (and .cse48 .cse49 (<= main_~x~0 19) (<= 19 main_~x~0)) (and (<= main_~x~0 32) (<= 32 main_~x~0) .cse41 .cse40) (and .cse50 (<= main_~x~0 75) (<= 75 main_~x~0) .cse51) (and .cse52 .cse53 (<= 76 main_~x~0) (<= main_~x~0 76)) (and (<= main_~x~0 3) .cse54 (<= 3 main_~x~0) .cse55) (and (<= main_~x~0 100) .cse56 (<= 100 main_~x~0) .cse57) (and .cse24 (<= 71 main_~x~0) (<= main_~x~0 71) .cse25) (and (<= 74 main_~x~0) .cse20 (<= main_~x~0 74) .cse21) (and .cse27 (<= 77 main_~x~0) .cse26 (<= main_~x~0 77)) (and (<= main_~x~0 39) .cse58 (<= 39 main_~x~0) .cse59) (and (<= 57 main_~x~0) (<= main_~x~0 57) .cse60 .cse61) (and (<= 10 main_~x~0) .cse62 .cse63 (<= main_~x~0 10)) (and .cse64 .cse65 (<= 4 main_~x~0) (<= main_~x~0 4)) (and .cse66 (<= main_~x~0 87) .cse67 (<= 87 main_~x~0)) (and .cse68 (<= main_~x~0 33) .cse69 (<= 33 main_~x~0)) (and (<= 9 main_~x~0) (<= main_~x~0 9) .cse3 .cse2) (and (<= 93 main_~x~0) .cse44 (<= main_~x~0 93) .cse45) (and .cse56 (<= main_~x~0 0) (<= 0 main_~x~0) .cse57) (and (<= 8 main_~x~0) (<= main_~x~0 8) .cse36 .cse37) (and .cse12 (<= main_~x~0 79) (<= 79 main_~x~0) .cse13) (and .cse19 (<= 14 main_~x~0) .cse18 (<= main_~x~0 14)) (and (<= main_~x~0 24) .cse53 (<= 24 main_~x~0) .cse52) (and (<= 61 main_~x~0) .cse59 .cse58 (<= main_~x~0 61)) (and (<= main_~x~0 95) .cse70 .cse71 (<= 95 main_~x~0)) (and .cse70 (<= 5 main_~x~0) .cse71 (<= main_~x~0 5)) (and (<= main_~x~0 16) (<= 16 main_~x~0) .cse0 .cse1) (and .cse72 .cse73 (<= 65 main_~x~0) (<= main_~x~0 65)) (and .cse74 .cse75 (<= main_~x~0 55) (<= 55 main_~x~0)) (and (<= main_~x~0 73) .cse76 (<= 73 main_~x~0) .cse77) (and (<= 25 main_~x~0) .cse50 .cse51 (<= main_~x~0 25)) (and (<= 97 main_~x~0) .cse54 .cse55 (<= main_~x~0 97)) (and (<= main_~x~0 44) (<= 44 main_~x~0) .cse78 .cse79) (and .cse8 (<= main_~x~0 6) .cse9 (<= 6 main_~x~0)) (and (<= 15 main_~x~0) .cse80 .cse81 (<= main_~x~0 15)) (and .cse82 .cse83 (<= main_~x~0 47) (<= 47 main_~x~0)) (and (<= main_~x~0 17) .cse84 .cse85 (<= 17 main_~x~0)) (and (<= 80 main_~x~0) (<= main_~x~0 80) .cse86 .cse87) (and (<= 54 main_~x~0) .cse88 (<= main_~x~0 54) .cse89) (and (<= 31 main_~x~0) .cse90 (<= main_~x~0 31) .cse91) (and (<= 50 main_~x~0) (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and .cse85 .cse84 (<= 83 main_~x~0) (<= main_~x~0 83)) (and .cse88 (<= main_~x~0 46) (<= 46 main_~x~0) .cse89) (and (<= 2 main_~x~0) .cse92 (<= main_~x~0 2) .cse93) (and .cse32 (<= 62 main_~x~0) (<= main_~x~0 62) .cse33) (and .cse92 (<= main_~x~0 98) .cse93 (<= 98 main_~x~0)) (and .cse94 (<= main_~x~0 37) (<= 37 main_~x~0) .cse95) (and .cse31 .cse30 (<= main_~x~0 60) (<= 60 main_~x~0)) (and .cse48 (<= main_~x~0 81) (<= 81 main_~x~0) .cse49) (and .cse64 .cse65 (<= main_~x~0 96) (<= 96 main_~x~0)) (and .cse69 (<= 67 main_~x~0) .cse68 (<= main_~x~0 67)) (and (<= 35 main_~x~0) .cse73 (<= main_~x~0 35) .cse72) (and (<= main_~x~0 42) .cse16 .cse17 (<= 42 main_~x~0)) (and (<= 63 main_~x~0) (<= main_~x~0 63) .cse95 .cse94) (and .cse6 (<= main_~x~0 1) (<= 1 main_~x~0) .cse7) (and (<= 13 main_~x~0) .cse66 (<= main_~x~0 13) .cse67) (and (<= main_~x~0 88) (<= 88 main_~x~0) .cse96 .cse97) (and (<= 43 main_~x~0) .cse61 .cse60 (<= main_~x~0 43)) (and (<= main_~x~0 64) .cse98 (<= 64 main_~x~0) .cse99) (and .cse46 .cse47 (<= 82 main_~x~0) (<= main_~x~0 82)) (and .cse10 (<= 59 main_~x~0) (<= main_~x~0 59) .cse11) (and (<= main_~x~0 56) .cse78 .cse79 (<= 56 main_~x~0)) (and .cse98 (<= main_~x~0 36) .cse99 (<= 36 main_~x~0)) (and .cse83 (<= 53 main_~x~0) .cse82 (<= main_~x~0 53)) (and (<= 20 main_~x~0) (<= main_~x~0 20) .cse87 .cse86) (and (<= main_~x~0 27) .cse77 (<= 27 main_~x~0) .cse76) (and .cse39 .cse38 (<= 11 main_~x~0) (<= main_~x~0 11)) (and (<= main_~x~0 48) .cse5 .cse4 (<= 48 main_~x~0)) (and .cse42 (<= main_~x~0 70) .cse43 (<= 70 main_~x~0)) (and (<= main_~x~0 12) (<= 12 main_~x~0) .cse97 .cse96) (and (<= main_~x~0 78) .cse34 .cse35 (<= 78 main_~x~0)) (and .cse81 (<= main_~x~0 85) (<= 85 main_~x~0) .cse80) (and .cse90 (<= main_~x~0 69) (<= 69 main_~x~0) .cse91) (and .cse62 .cse63 (<= 90 main_~x~0) (<= main_~x~0 90)) (and .cse22 (<= 49 main_~x~0) .cse23 (<= main_~x~0 49)) (and (<= 45 main_~x~0) .cse75 .cse74 (<= main_~x~0 45)))) [2018-11-22 22:13:59,586 INFO L444 ceAbstractionStarter]: At program point L14-3(lines 14 22) the Hoare annotation is: (and (<= main_~x~0 100) (<= 100 main_~x~0)) [2018-11-22 22:13:59,586 INFO L451 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-11-22 22:13:59,586 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-11-22 22:13:59,586 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-11-22 22:13:59,586 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-11-22 22:13:59,586 INFO L448 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-11-22 22:13:59,586 INFO L448 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-11-22 22:13:59,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 10:13:59 BoogieIcfgContainer [2018-11-22 22:13:59,610 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-22 22:13:59,610 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-22 22:13:59,610 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-22 22:13:59,610 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-22 22:13:59,611 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 10:12:51" (3/4) ... [2018-11-22 22:13:59,619 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-22 22:13:59,625 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-22 22:13:59,625 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-22 22:13:59,625 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-11-22 22:13:59,628 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2018-11-22 22:13:59,628 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2018-11-22 22:13:59,628 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-22 22:13:59,659 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_6d44357e-081a-419d-9315-72d6747a87bc/bin-2019/utaipan/witness.graphml [2018-11-22 22:13:59,659 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-22 22:13:59,660 INFO L168 Benchmark]: Toolchain (without parser) took 68305.91 ms. Allocated memory was 1.0 GB in the beginning and 2.0 GB in the end (delta: 940.6 MB). Free memory was 958.1 MB in the beginning and 1.2 GB in the end (delta: -208.5 MB). Peak memory consumption was 732.1 MB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,661 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-22 22:13:59,661 INFO L168 Benchmark]: CACSL2BoogieTranslator took 144.92 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 MB in the beginning and 947.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,661 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.21 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-22 22:13:59,661 INFO L168 Benchmark]: Boogie Preprocessor took 13.41 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,662 INFO L168 Benchmark]: RCFGBuilder took 163.26 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 122.2 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -163.5 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,662 INFO L168 Benchmark]: TraceAbstraction took 67920.81 ms. Allocated memory was 1.2 GB in the beginning and 2.0 GB in the end (delta: 818.4 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -81.0 MB). Peak memory consumption was 1.2 GB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,662 INFO L168 Benchmark]: Witness Printer took 49.45 ms. Allocated memory is still 2.0 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 22.5 MB). Peak memory consumption was 22.5 MB. Max. memory is 11.5 GB. [2018-11-22 22:13:59,664 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 144.92 ms. Allocated memory is still 1.0 GB. Free memory was 958.1 MB in the beginning and 947.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.21 ms. Allocated memory is still 1.0 GB. Free memory is still 947.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 13.41 ms. Allocated memory is still 1.0 GB. Free memory was 947.3 MB in the beginning and 944.6 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 163.26 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 122.2 MB). Free memory was 944.6 MB in the beginning and 1.1 GB in the end (delta: -163.5 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. * TraceAbstraction took 67920.81 ms. Allocated memory was 1.2 GB in the beginning and 2.0 GB in the end (delta: 818.4 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -81.0 MB). Peak memory consumption was 1.2 GB. Max. memory is 11.5 GB. * Witness Printer took 49.45 ms. Allocated memory is still 2.0 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 22.5 MB). Peak memory consumption was 22.5 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((y <= 16 && 84 <= x) && 16 <= y) && x <= 84) || (((x <= 91 && 91 <= x) && y <= 9) && 9 <= y)) || (((48 <= y && y <= 48) && x <= 52) && 52 <= x)) || (((x <= 99 && 1 <= y) && y <= 1) && 99 <= x)) || (((94 <= x && y <= 6) && x <= 94) && 6 <= y)) || (((y <= 41 && x <= 41) && 41 <= y) && 41 <= x)) || (((x <= 21 && y <= 21) && 21 <= y) && 21 <= x)) || (((x <= 28 && 28 <= y) && y <= 28) && 28 <= x)) || (((58 <= x && y <= 42) && x <= 58) && 42 <= y)) || (((y <= 28 && 72 <= x) && 28 <= y) && x <= 72)) || (((14 <= y && x <= 86) && y <= 14) && 86 <= x)) || (((x <= 26 && 26 <= x) && 26 <= y) && y <= 26)) || (((49 <= y && x <= 51) && 51 <= x) && y <= 49)) || (((y <= 29 && 29 <= x) && 29 <= y) && x <= 29)) || (((23 <= y && x <= 23) && y <= 23) && 23 <= x)) || (((y <= 34 && 66 <= x) && 34 <= y) && x <= 66)) || (((40 <= y && 40 <= x) && x <= 40) && y <= 40)) || (((38 <= y && x <= 38) && 38 <= x) && y <= 38)) || (((34 <= x && x <= 34) && 34 <= y) && y <= 34)) || (((x <= 22 && 22 <= x) && 22 <= y) && y <= 22)) || (((x <= 92 && 8 <= y) && y <= 8) && 92 <= x)) || (((y <= 11 && 89 <= x) && 11 <= y) && x <= 89)) || (((68 <= x && 32 <= y) && x <= 68) && y <= 32)) || (((30 <= y && 30 <= x) && x <= 30) && y <= 30)) || (((y <= 7 && x <= 7) && 7 <= y) && 7 <= x)) || (((18 <= y && x <= 18) && 18 <= x) && y <= 18)) || (((19 <= y && y <= 19) && x <= 19) && 19 <= x)) || (((x <= 32 && 32 <= x) && y <= 32) && 32 <= y)) || (((25 <= y && x <= 75) && 75 <= x) && y <= 25)) || (((y <= 24 && 24 <= y) && 76 <= x) && x <= 76)) || (((x <= 3 && y <= 3) && 3 <= x) && 3 <= y)) || (((x <= 100 && 0 <= y) && 100 <= x) && y <= 0)) || (((y <= 29 && 71 <= x) && x <= 71) && 29 <= y)) || (((74 <= x && 26 <= y) && x <= 74) && y <= 26)) || (((y <= 23 && 77 <= x) && 23 <= y) && x <= 77)) || (((x <= 39 && y <= 39) && 39 <= x) && 39 <= y)) || (((57 <= x && x <= 57) && y <= 43) && 43 <= y)) || (((10 <= x && y <= 10) && 10 <= y) && x <= 10)) || (((y <= 4 && 4 <= y) && 4 <= x) && x <= 4)) || (((y <= 13 && x <= 87) && 13 <= y) && 87 <= x)) || (((33 <= y && x <= 33) && y <= 33) && 33 <= x)) || (((9 <= x && x <= 9) && 9 <= y) && y <= 9)) || (((93 <= x && y <= 7) && x <= 93) && 7 <= y)) || (((0 <= y && x <= 0) && 0 <= x) && y <= 0)) || (((8 <= x && x <= 8) && 8 <= y) && y <= 8)) || (((y <= 21 && x <= 79) && 79 <= x) && 21 <= y)) || (((y <= 14 && 14 <= x) && 14 <= y) && x <= 14)) || (((x <= 24 && 24 <= y) && 24 <= x) && y <= 24)) || (((61 <= x && 39 <= y) && y <= 39) && x <= 61)) || (((x <= 95 && 5 <= y) && y <= 5) && 95 <= x)) || (((5 <= y && 5 <= x) && y <= 5) && x <= 5)) || (((x <= 16 && 16 <= x) && y <= 16) && 16 <= y)) || (((y <= 35 && 35 <= y) && 65 <= x) && x <= 65)) || (((45 <= y && y <= 45) && x <= 55) && 55 <= x)) || (((x <= 73 && 27 <= y) && 73 <= x) && y <= 27)) || (((25 <= x && 25 <= y) && y <= 25) && x <= 25)) || (((97 <= x && y <= 3) && 3 <= y) && x <= 97)) || (((x <= 44 && 44 <= x) && 44 <= y) && y <= 44)) || (((y <= 6 && x <= 6) && 6 <= y) && 6 <= x)) || (((15 <= x && 15 <= y) && y <= 15) && x <= 15)) || (((47 <= y && y <= 47) && x <= 47) && 47 <= x)) || (((x <= 17 && 17 <= y) && y <= 17) && 17 <= x)) || (((80 <= x && x <= 80) && y <= 20) && 20 <= y)) || (((54 <= x && 46 <= y) && x <= 54) && y <= 46)) || (((31 <= x && 31 <= y) && x <= 31) && y <= 31)) || (((50 <= x && y <= 50) && x <= 50) && 50 <= y)) || (((y <= 17 && 17 <= y) && 83 <= x) && x <= 83)) || (((46 <= y && x <= 46) && 46 <= x) && y <= 46)) || (((2 <= x && y <= 2) && x <= 2) && 2 <= y)) || (((38 <= y && 62 <= x) && x <= 62) && y <= 38)) || (((y <= 2 && x <= 98) && 2 <= y) && 98 <= x)) || (((37 <= y && x <= 37) && 37 <= x) && y <= 37)) || (((y <= 40 && 40 <= y) && x <= 60) && 60 <= x)) || (((19 <= y && x <= 81) && 81 <= x) && y <= 19)) || (((y <= 4 && 4 <= y) && x <= 96) && 96 <= x)) || (((y <= 33 && 67 <= x) && 33 <= y) && x <= 67)) || (((35 <= x && 35 <= y) && x <= 35) && y <= 35)) || (((x <= 42 && y <= 42) && 42 <= y) && 42 <= x)) || (((63 <= x && x <= 63) && y <= 37) && 37 <= y)) || (((1 <= y && x <= 1) && 1 <= x) && y <= 1)) || (((13 <= x && y <= 13) && x <= 13) && 13 <= y)) || (((x <= 88 && 88 <= x) && 12 <= y) && y <= 12)) || (((43 <= x && 43 <= y) && y <= 43) && x <= 43)) || (((x <= 64 && y <= 36) && 64 <= x) && 36 <= y)) || (((18 <= y && y <= 18) && 82 <= x) && x <= 82)) || (((y <= 41 && 59 <= x) && x <= 59) && 41 <= y)) || (((x <= 56 && 44 <= y) && y <= 44) && 56 <= x)) || (((y <= 36 && x <= 36) && 36 <= y) && 36 <= x)) || (((y <= 47 && 53 <= x) && 47 <= y) && x <= 53)) || (((20 <= x && x <= 20) && 20 <= y) && y <= 20)) || (((x <= 27 && y <= 27) && 27 <= x) && 27 <= y)) || (((11 <= y && y <= 11) && 11 <= x) && x <= 11)) || (((x <= 48 && y <= 48) && 48 <= y) && 48 <= x)) || (((30 <= y && x <= 70) && y <= 30) && 70 <= x)) || (((x <= 12 && 12 <= x) && y <= 12) && 12 <= y)) || (((x <= 78 && 22 <= y) && y <= 22) && 78 <= x)) || (((y <= 15 && x <= 85) && 85 <= x) && 15 <= y)) || (((31 <= y && x <= 69) && 69 <= x) && y <= 31)) || (((y <= 10 && 10 <= y) && 90 <= x) && x <= 90)) || (((49 <= y && 49 <= x) && y <= 49) && x <= 49)) || (((45 <= x && y <= 45) && 45 <= y) && x <= 45) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 67.8s OverallTime, 55 OverallIterations, 103 TraceHistogramMax, 15.3s AutomataDifference, 0.0s DeadEndRemovalTime, 6.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 1027 SDtfs, 911 SDslu, 18508 SDs, 0 SdLazy, 12835 SolverSat, 2300 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14590 GetRequests, 11104 SyntacticMatches, 845 SemanticMatches, 2641 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47102 ImplicationChecksByTransitivity, 38.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=4190occurred in iteration=54, 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: 5.5s AutomataMinimizationTime, 55 MinimizatonAttempts, 2153 StatesRemovedByMinimization, 51 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 62 PreInvPairs, 164 NumberOfFragments, 1326 HoareAnnotationTreeSize, 62 FomulaSimplifications, 25863515 FormulaSimplificationTreeSizeReduction, 2.8s HoareSimplificationTime, 7 FomulaSimplificationsInter, 10642 FormulaSimplificationTreeSizeReductionInter, 3.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 1.4s SatisfiabilityAnalysisTime, 36.8s InterpolantComputationTime, 12778 NumberOfCodeBlocks, 12301 NumberOfCodeBlocksAsserted, 592 NumberOfCheckSat, 18834 ConstructedInterpolants, 0 QuantifiedInterpolants, 7788220 SizeOfPredicates, 68 NumberOfNonLiveVariables, 13384 ConjunctsInSsa, 1465 ConjunctsInUnsatCore, 157 InterpolantComputations, 4 PerfectInterpolantSequences, 261308/448443 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...