./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.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 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/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_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/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 0.1.23-1dbac8b [2018-10-27 00:11:56,729 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 00:11:56,730 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 00:11:56,741 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 00:11:56,741 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 00:11:56,742 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 00:11:56,743 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 00:11:56,744 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 00:11:56,746 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 00:11:56,747 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 00:11:56,748 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 00:11:56,748 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 00:11:56,749 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 00:11:56,750 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 00:11:56,751 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 00:11:56,752 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 00:11:56,753 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 00:11:56,755 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 00:11:56,756 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 00:11:56,758 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 00:11:56,759 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 00:11:56,760 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 00:11:56,762 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 00:11:56,762 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 00:11:56,763 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 00:11:56,763 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 00:11:56,764 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 00:11:56,765 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 00:11:56,766 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 00:11:56,766 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 00:11:56,767 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 00:11:56,767 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 00:11:56,767 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 00:11:56,767 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 00:11:56,768 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 00:11:56,770 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 00:11:56,770 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-27 00:11:56,789 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 00:11:56,790 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 00:11:56,791 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 00:11:56,792 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 00:11:56,792 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 00:11:56,792 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 00:11:56,792 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 00:11:56,793 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 00:11:56,793 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 00:11:56,794 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 00:11:56,794 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 00:11:56,795 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 00:11:56,796 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 00:11:56,797 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 00:11:56,798 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-27 00:11:56,798 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 00:11:56,798 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 00:11:56,798 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 00:11:56,798 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 00:11:56,798 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 00:11:56,799 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 00:11:56,799 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 00:11:56,799 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 00:11:56,799 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 00:11:56,799 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 00:11:56,799 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 00:11:56,800 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 00:11:56,800 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 00:11:56,800 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 00:11:56,800 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_c1269cbb-175d-497c-8947-3529add26669/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 [2018-10-27 00:11:56,843 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 00:11:56,855 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 00:11:56,860 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 00:11:56,861 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 00:11:56,862 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 00:11:56,862 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/../../sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-10-27 00:11:56,926 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/data/c16036155/00f5f844f8924cd7a5d7b24cdb91163a/FLAGbd1ca22ad [2018-10-27 00:11:57,334 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 00:11:57,336 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/sv-benchmarks/c/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-10-27 00:11:57,342 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/data/c16036155/00f5f844f8924cd7a5d7b24cdb91163a/FLAGbd1ca22ad [2018-10-27 00:11:57,360 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/data/c16036155/00f5f844f8924cd7a5d7b24cdb91163a [2018-10-27 00:11:57,364 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 00:11:57,366 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-27 00:11:57,367 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 00:11:57,371 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 00:11:57,375 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 00:11:57,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@100306ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57, skipping insertion in model container [2018-10-27 00:11:57,383 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,394 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 00:11:57,416 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 00:11:57,591 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 00:11:57,594 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 00:11:57,611 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 00:11:57,625 INFO L193 MainTranslator]: Completed translation [2018-10-27 00:11:57,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57 WrapperNode [2018-10-27 00:11:57,625 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 00:11:57,626 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 00:11:57,626 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 00:11:57,626 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 00:11:57,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,641 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,647 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 00:11:57,647 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 00:11:57,647 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 00:11:57,647 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 00:11:57,657 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,657 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,658 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,662 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,670 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,671 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... [2018-10-27 00:11:57,672 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 00:11:57,672 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 00:11:57,673 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 00:11:57,673 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 00:11:57,674 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 00:11:57,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 00:11:57,837 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 00:11:57,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 00:11:57,838 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 00:11:57,838 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 00:11:57,838 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 00:11:57,838 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 00:11:57,839 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 00:11:58,259 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 00:11:58,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:11:58 BoogieIcfgContainer [2018-10-27 00:11:58,260 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 00:11:58,261 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 00:11:58,262 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 00:11:58,265 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 00:11:58,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 12:11:57" (1/3) ... [2018-10-27 00:11:58,266 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f8d7c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:11:58, skipping insertion in model container [2018-10-27 00:11:58,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:11:57" (2/3) ... [2018-10-27 00:11:58,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f8d7c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:11:58, skipping insertion in model container [2018-10-27 00:11:58,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:11:58" (3/3) ... [2018-10-27 00:11:58,270 INFO L112 eAbstractionObserver]: Analyzing ICFG gr2006_true-unreach-call_true-termination.c.i [2018-10-27 00:11:58,281 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 00:11:58,288 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 00:11:58,305 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 00:11:58,336 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 00:11:58,337 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 00:11:58,337 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 00:11:58,337 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 00:11:58,337 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 00:11:58,337 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 00:11:58,338 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 00:11:58,338 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 00:11:58,356 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-27 00:11:58,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 00:11:58,362 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:11:58,363 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:11:58,365 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:11:58,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:58,372 INFO L82 PathProgramCache]: Analyzing trace with hash -859010367, now seen corresponding path program 1 times [2018-10-27 00:11:58,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:11:58,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:58,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,430 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:11:58,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:58,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 00:11:58,487 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 00:11:58,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 00:11:58,488 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 00:11:58,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 00:11:58,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 00:11:58,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 00:11:58,510 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-27 00:11:58,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:11:58,532 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2018-10-27 00:11:58,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 00:11:58,534 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 00:11:58,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:11:58,543 INFO L225 Difference]: With dead ends: 33 [2018-10-27 00:11:58,543 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 00:11:58,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 00:11:58,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 00:11:58,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 00:11:58,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 00:11:58,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-27 00:11:58,584 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-27 00:11:58,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:11:58,585 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-27 00:11:58,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 00:11:58,585 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-27 00:11:58,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 00:11:58,585 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:11:58,586 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:11:58,586 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:11:58,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:58,586 INFO L82 PathProgramCache]: Analyzing trace with hash 220608140, now seen corresponding path program 1 times [2018-10-27 00:11:58,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:11:58,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:58,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:11:58,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:58,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 00:11:58,736 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 00:11:58,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-27 00:11:58,737 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 00:11:58,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 00:11:58,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 00:11:58,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 00:11:58,739 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 4 states. [2018-10-27 00:11:58,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:11:58,837 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-27 00:11:58,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 00:11:58,838 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 00:11:58,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:11:58,839 INFO L225 Difference]: With dead ends: 24 [2018-10-27 00:11:58,839 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 00:11:58,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 00:11:58,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 00:11:58,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 00:11:58,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 00:11:58,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-27 00:11:58,843 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2018-10-27 00:11:58,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:11:58,844 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-27 00:11:58,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 00:11:58,844 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-27 00:11:58,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 00:11:58,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:11:58,848 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:11:58,848 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:11:58,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:58,849 INFO L82 PathProgramCache]: Analyzing trace with hash 277866442, now seen corresponding path program 1 times [2018-10-27 00:11:58,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:11:58,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:58,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:11:58,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:58,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 00:11:58,886 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 00:11:58,886 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 00:11:58,886 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 00:11:58,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 00:11:58,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 00:11:58,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 00:11:58,888 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2018-10-27 00:11:58,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:11:58,913 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2018-10-27 00:11:58,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 00:11:58,915 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-27 00:11:58,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:11:58,916 INFO L225 Difference]: With dead ends: 37 [2018-10-27 00:11:58,916 INFO L226 Difference]: Without dead ends: 23 [2018-10-27 00:11:58,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 00:11:58,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-27 00:11:58,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-10-27 00:11:58,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 00:11:58,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-27 00:11:58,922 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2018-10-27 00:11:58,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:11:58,922 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-27 00:11:58,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 00:11:58,922 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-27 00:11:58,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 00:11:58,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:11:58,923 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:11:58,924 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:11:58,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:58,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1383636324, now seen corresponding path program 1 times [2018-10-27 00:11:58,924 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:11:58,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:58,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:58,926 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:11:58,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:58,977 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 00:11:58,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:11:58,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:11:58,978 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-27 00:11:58,980 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [14], [17], [19], [23], [25], [32], [35], [37], [43], [44], [45], [47] [2018-10-27 00:11:59,033 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 00:11:59,033 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 00:11:59,354 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 00:11:59,356 INFO L272 AbstractInterpreter]: Visited 15 different actions 79 times. Merged at 6 different actions 40 times. Widened at 1 different actions 5 times. Found 5 fixpoints after 2 different actions. Largest state had 5 variables. [2018-10-27 00:11:59,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:59,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 00:11:59,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:11:59,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:11:59,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:59,396 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:11:59,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:59,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:11:59,448 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 00:11:59,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:11:59,546 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 00:11:59,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:11:59,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 00:11:59,582 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:11:59,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 00:11:59,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 00:11:59,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-27 00:11:59,585 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2018-10-27 00:11:59,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:11:59,617 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2018-10-27 00:11:59,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 00:11:59,621 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2018-10-27 00:11:59,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:11:59,622 INFO L225 Difference]: With dead ends: 41 [2018-10-27 00:11:59,622 INFO L226 Difference]: Without dead ends: 27 [2018-10-27 00:11:59,622 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-27 00:11:59,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-27 00:11:59,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-27 00:11:59,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 00:11:59,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-27 00:11:59,626 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2018-10-27 00:11:59,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:11:59,627 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-27 00:11:59,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 00:11:59,627 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-27 00:11:59,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 00:11:59,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:11:59,628 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:11:59,628 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:11:59,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:11:59,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1112171374, now seen corresponding path program 2 times [2018-10-27 00:11:59,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:11:59,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:59,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:11:59,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:11:59,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:11:59,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:11:59,700 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-27 00:11:59,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:11:59,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:11:59,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:11:59,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:11:59,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:11:59,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:11:59,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:11:59,719 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:11:59,786 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 00:11:59,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:11:59,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:00,134 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 00:12:00,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:00,244 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 00:12:00,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:00,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 00:12:00,274 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:00,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 00:12:00,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 00:12:00,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-10-27 00:12:00,276 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2018-10-27 00:12:00,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:00,533 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-10-27 00:12:00,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 00:12:00,539 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-27 00:12:00,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:00,540 INFO L225 Difference]: With dead ends: 54 [2018-10-27 00:12:00,540 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 00:12:00,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2018-10-27 00:12:00,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 00:12:00,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2018-10-27 00:12:00,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 00:12:00,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2018-10-27 00:12:00,553 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 25 [2018-10-27 00:12:00,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:00,553 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2018-10-27 00:12:00,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 00:12:00,553 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2018-10-27 00:12:00,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 00:12:00,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:00,554 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:00,555 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:00,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:00,555 INFO L82 PathProgramCache]: Analyzing trace with hash 951638316, now seen corresponding path program 3 times [2018-10-27 00:12:00,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:00,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:00,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:00,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:00,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:00,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:00,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:00,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:00,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:00,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:00,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:00,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:00,662 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:00,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:00,692 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:00,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:00,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:00,707 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:00,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:00,790 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:00,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:00,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 00:12:00,823 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:00,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 00:12:00,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 00:12:00,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-27 00:12:00,824 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 6 states. [2018-10-27 00:12:00,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:00,867 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2018-10-27 00:12:00,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 00:12:00,868 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2018-10-27 00:12:00,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:00,869 INFO L225 Difference]: With dead ends: 57 [2018-10-27 00:12:00,869 INFO L226 Difference]: Without dead ends: 39 [2018-10-27 00:12:00,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-27 00:12:00,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-27 00:12:00,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-27 00:12:00,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 00:12:00,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2018-10-27 00:12:00,876 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 33 [2018-10-27 00:12:00,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:00,876 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2018-10-27 00:12:00,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 00:12:00,876 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2018-10-27 00:12:00,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 00:12:00,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:00,877 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:00,878 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:00,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:00,878 INFO L82 PathProgramCache]: Analyzing trace with hash 150635354, now seen corresponding path program 4 times [2018-10-27 00:12:00,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:00,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:00,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:00,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:00,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:00,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:00,972 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:00,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:00,972 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:00,972 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:00,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:00,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:00,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:00,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:00,982 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:01,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:01,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:01,010 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:01,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:01,115 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 42 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:01,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:01,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 00:12:01,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:01,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 00:12:01,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 00:12:01,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-27 00:12:01,149 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 7 states. [2018-10-27 00:12:01,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:01,419 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-27 00:12:01,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 00:12:01,424 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2018-10-27 00:12:01,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:01,425 INFO L225 Difference]: With dead ends: 61 [2018-10-27 00:12:01,425 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 00:12:01,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-27 00:12:01,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 00:12:01,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-27 00:12:01,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 00:12:01,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-27 00:12:01,437 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2018-10-27 00:12:01,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:01,437 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-27 00:12:01,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 00:12:01,437 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-27 00:12:01,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 00:12:01,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:01,438 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:01,439 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:01,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:01,439 INFO L82 PathProgramCache]: Analyzing trace with hash 786392712, now seen corresponding path program 5 times [2018-10-27 00:12:01,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:01,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:01,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:01,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:01,445 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:01,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 51 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-27 00:12:01,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:01,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:01,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:01,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:01,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:01,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:01,583 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:01,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:01,618 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 00:12:01,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:01,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:01,679 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 79 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 00:12:01,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:01,773 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 79 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 00:12:01,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:01,793 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2018-10-27 00:12:01,793 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:01,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 00:12:01,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 00:12:01,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-10-27 00:12:01,795 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 12 states. [2018-10-27 00:12:02,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:02,188 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2018-10-27 00:12:02,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 00:12:02,191 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2018-10-27 00:12:02,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:02,192 INFO L225 Difference]: With dead ends: 78 [2018-10-27 00:12:02,192 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 00:12:02,193 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=134, Invalid=286, Unknown=0, NotChecked=0, Total=420 [2018-10-27 00:12:02,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 00:12:02,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 50. [2018-10-27 00:12:02,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 00:12:02,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-10-27 00:12:02,202 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2018-10-27 00:12:02,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:02,203 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-10-27 00:12:02,203 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 00:12:02,203 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-10-27 00:12:02,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 00:12:02,204 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:02,204 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:02,207 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:02,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:02,207 INFO L82 PathProgramCache]: Analyzing trace with hash 568630306, now seen corresponding path program 6 times [2018-10-27 00:12:02,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:02,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:02,208 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:02,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:02,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:02,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:02,304 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:02,304 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:02,305 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:02,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:02,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:02,305 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:02,313 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:02,313 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:02,329 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:02,329 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:02,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:02,343 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:02,467 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 87 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:02,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 00:12:02,488 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:02,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 00:12:02,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 00:12:02,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-27 00:12:02,489 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 9 states. [2018-10-27 00:12:02,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:02,534 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2018-10-27 00:12:02,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 00:12:02,535 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 49 [2018-10-27 00:12:02,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:02,536 INFO L225 Difference]: With dead ends: 77 [2018-10-27 00:12:02,536 INFO L226 Difference]: Without dead ends: 55 [2018-10-27 00:12:02,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-27 00:12:02,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-27 00:12:02,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-27 00:12:02,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 00:12:02,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-27 00:12:02,543 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 49 [2018-10-27 00:12:02,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:02,543 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-27 00:12:02,543 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 00:12:02,543 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-27 00:12:02,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 00:12:02,544 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:02,544 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:02,544 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:02,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:02,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1676137904, now seen corresponding path program 7 times [2018-10-27 00:12:02,545 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:02,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:02,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:02,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:02,546 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:02,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:02,650 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:02,651 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:02,651 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:02,651 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:02,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:02,651 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:02,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:02,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:02,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:02,691 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:02,928 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 100 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:02,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:02,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 00:12:02,949 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:02,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 00:12:02,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 00:12:02,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-27 00:12:02,950 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 10 states. [2018-10-27 00:12:03,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:03,104 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2018-10-27 00:12:03,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 00:12:03,105 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2018-10-27 00:12:03,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:03,106 INFO L225 Difference]: With dead ends: 81 [2018-10-27 00:12:03,106 INFO L226 Difference]: Without dead ends: 59 [2018-10-27 00:12:03,107 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-27 00:12:03,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-27 00:12:03,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2018-10-27 00:12:03,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 00:12:03,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2018-10-27 00:12:03,112 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 53 [2018-10-27 00:12:03,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:03,112 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2018-10-27 00:12:03,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 00:12:03,113 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2018-10-27 00:12:03,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 00:12:03,114 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:03,114 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:03,114 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:03,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:03,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1738739330, now seen corresponding path program 8 times [2018-10-27 00:12:03,115 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:03,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:03,116 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:03,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:03,116 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:03,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:03,212 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 113 proven. 136 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 00:12:03,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:03,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:03,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:03,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:03,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:03,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:03,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:03,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:03,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 00:12:03,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:03,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:03,320 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 185 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-27 00:12:03,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:03,404 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 185 proven. 43 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-27 00:12:03,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:03,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 16 [2018-10-27 00:12:03,424 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:03,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 00:12:03,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 00:12:03,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2018-10-27 00:12:03,427 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 16 states. [2018-10-27 00:12:03,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:03,600 INFO L93 Difference]: Finished difference Result 102 states and 116 transitions. [2018-10-27 00:12:03,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 00:12:03,605 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 57 [2018-10-27 00:12:03,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:03,606 INFO L225 Difference]: With dead ends: 102 [2018-10-27 00:12:03,606 INFO L226 Difference]: Without dead ends: 80 [2018-10-27 00:12:03,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 102 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=247, Invalid=565, Unknown=0, NotChecked=0, Total=812 [2018-10-27 00:12:03,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-10-27 00:12:03,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2018-10-27 00:12:03,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 00:12:03,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-27 00:12:03,612 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 57 [2018-10-27 00:12:03,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:03,612 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-27 00:12:03,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 00:12:03,613 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-27 00:12:03,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 00:12:03,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:03,613 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:03,614 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:03,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:03,614 INFO L82 PathProgramCache]: Analyzing trace with hash 626237464, now seen corresponding path program 9 times [2018-10-27 00:12:03,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:03,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:03,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:03,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:03,615 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:03,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:03,738 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:03,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:03,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:03,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:03,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:03,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:03,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:03,751 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:03,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:03,797 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:03,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:03,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:03,811 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:03,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:04,494 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 165 proven. 171 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:04,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:04,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 00:12:04,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:04,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 00:12:04,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 00:12:04,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-27 00:12:04,519 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 12 states. [2018-10-27 00:12:04,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:04,633 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2018-10-27 00:12:04,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 00:12:04,635 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 65 [2018-10-27 00:12:04,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:04,636 INFO L225 Difference]: With dead ends: 97 [2018-10-27 00:12:04,636 INFO L226 Difference]: Without dead ends: 71 [2018-10-27 00:12:04,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-27 00:12:04,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-10-27 00:12:04,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-10-27 00:12:04,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 00:12:04,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2018-10-27 00:12:04,644 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 65 [2018-10-27 00:12:04,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:04,646 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2018-10-27 00:12:04,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 00:12:04,647 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2018-10-27 00:12:04,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 00:12:04,648 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:04,648 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:04,648 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:04,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:04,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1859055034, now seen corresponding path program 10 times [2018-10-27 00:12:04,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:04,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:04,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:04,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:04,649 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:04,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:04,815 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:04,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:04,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:04,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:04,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:04,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:04,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:04,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:04,826 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:04,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:04,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:04,871 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:04,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:05,358 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 182 proven. 210 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:05,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:05,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 00:12:05,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:05,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 00:12:05,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 00:12:05,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-27 00:12:05,380 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand 13 states. [2018-10-27 00:12:05,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:05,411 INFO L93 Difference]: Finished difference Result 101 states and 112 transitions. [2018-10-27 00:12:05,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 00:12:05,412 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 69 [2018-10-27 00:12:05,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:05,413 INFO L225 Difference]: With dead ends: 101 [2018-10-27 00:12:05,413 INFO L226 Difference]: Without dead ends: 75 [2018-10-27 00:12:05,413 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-27 00:12:05,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-27 00:12:05,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-27 00:12:05,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 00:12:05,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2018-10-27 00:12:05,419 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 69 [2018-10-27 00:12:05,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:05,419 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2018-10-27 00:12:05,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 00:12:05,419 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2018-10-27 00:12:05,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-27 00:12:05,420 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:05,423 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:05,423 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:05,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:05,424 INFO L82 PathProgramCache]: Analyzing trace with hash 260947316, now seen corresponding path program 11 times [2018-10-27 00:12:05,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:05,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:05,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:05,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:05,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:05,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:05,584 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 199 proven. 253 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-27 00:12:05,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:05,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:05,585 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:05,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:05,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:05,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:05,593 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:05,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:05,616 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 00:12:05,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:05,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:05,691 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 331 proven. 73 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 00:12:05,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:05,846 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 331 proven. 73 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 00:12:05,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:05,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8, 8] total 20 [2018-10-27 00:12:05,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:05,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 00:12:05,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 00:12:05,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 00:12:05,868 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand 20 states. [2018-10-27 00:12:06,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:06,175 INFO L93 Difference]: Finished difference Result 126 states and 143 transitions. [2018-10-27 00:12:06,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 00:12:06,175 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 73 [2018-10-27 00:12:06,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:06,176 INFO L225 Difference]: With dead ends: 126 [2018-10-27 00:12:06,176 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 00:12:06,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 131 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 00:12:06,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 00:12:06,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2018-10-27 00:12:06,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-27 00:12:06,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2018-10-27 00:12:06,186 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 73 [2018-10-27 00:12:06,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:06,187 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2018-10-27 00:12:06,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 00:12:06,187 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2018-10-27 00:12:06,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-27 00:12:06,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:06,191 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:06,191 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:06,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:06,191 INFO L82 PathProgramCache]: Analyzing trace with hash 749036814, now seen corresponding path program 12 times [2018-10-27 00:12:06,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:06,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:06,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:06,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:06,372 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:06,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:06,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:06,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:06,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:06,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:06,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:06,381 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:06,381 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:06,401 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:06,401 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:06,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:06,414 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:06,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:06,768 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 267 proven. 300 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:06,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:06,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 00:12:06,788 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:06,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 00:12:06,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 00:12:06,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-27 00:12:06,789 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand 15 states. [2018-10-27 00:12:06,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:06,827 INFO L93 Difference]: Finished difference Result 117 states and 130 transitions. [2018-10-27 00:12:06,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 00:12:06,828 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-10-27 00:12:06,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:06,829 INFO L225 Difference]: With dead ends: 117 [2018-10-27 00:12:06,829 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 00:12:06,830 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-27 00:12:06,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 00:12:06,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-27 00:12:06,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-27 00:12:06,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2018-10-27 00:12:06,836 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 81 [2018-10-27 00:12:06,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:06,836 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2018-10-27 00:12:06,836 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 00:12:06,836 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2018-10-27 00:12:06,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-27 00:12:06,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:06,846 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:06,846 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:06,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:06,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1642380092, now seen corresponding path program 13 times [2018-10-27 00:12:06,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:06,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:06,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:06,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:06,847 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:06,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:06,973 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:06,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:06,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:06,973 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:06,973 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:06,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:06,974 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:06,982 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:06,982 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:07,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:07,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:07,034 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:07,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:07,399 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 288 proven. 351 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:07,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:07,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 00:12:07,420 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:07,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 00:12:07,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 00:12:07,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-27 00:12:07,421 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand 16 states. [2018-10-27 00:12:07,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:07,469 INFO L93 Difference]: Finished difference Result 121 states and 134 transitions. [2018-10-27 00:12:07,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 00:12:07,470 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 85 [2018-10-27 00:12:07,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:07,470 INFO L225 Difference]: With dead ends: 121 [2018-10-27 00:12:07,470 INFO L226 Difference]: Without dead ends: 91 [2018-10-27 00:12:07,471 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-27 00:12:07,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-27 00:12:07,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-27 00:12:07,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 00:12:07,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-27 00:12:07,479 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 85 [2018-10-27 00:12:07,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:07,479 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-27 00:12:07,479 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 00:12:07,479 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-27 00:12:07,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 00:12:07,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:07,480 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:07,484 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:07,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:07,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1643034006, now seen corresponding path program 14 times [2018-10-27 00:12:07,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:07,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:07,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:07,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:07,485 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:07,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:07,703 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 309 proven. 406 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 00:12:07,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:07,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:07,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:07,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:07,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:07,704 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:07,712 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:07,712 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:07,734 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-27 00:12:07,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:07,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:07,858 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 517 proven. 111 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-10-27 00:12:07,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:08,054 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 517 proven. 111 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-10-27 00:12:08,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:08,074 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 24 [2018-10-27 00:12:08,074 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:08,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 00:12:08,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 00:12:08,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2018-10-27 00:12:08,076 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 24 states. [2018-10-27 00:12:08,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:08,498 INFO L93 Difference]: Finished difference Result 150 states and 170 transitions. [2018-10-27 00:12:08,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 00:12:08,499 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 89 [2018-10-27 00:12:08,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:08,500 INFO L225 Difference]: With dead ends: 150 [2018-10-27 00:12:08,500 INFO L226 Difference]: Without dead ends: 120 [2018-10-27 00:12:08,501 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 160 SyntacticMatches, 12 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=575, Invalid=1405, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 00:12:08,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-27 00:12:08,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 98. [2018-10-27 00:12:08,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-27 00:12:08,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2018-10-27 00:12:08,505 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 89 [2018-10-27 00:12:08,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:08,506 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2018-10-27 00:12:08,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 00:12:08,506 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2018-10-27 00:12:08,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-27 00:12:08,507 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:08,507 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:08,508 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:08,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:08,508 INFO L82 PathProgramCache]: Analyzing trace with hash -172397820, now seen corresponding path program 15 times [2018-10-27 00:12:08,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:08,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:08,513 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:08,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:08,514 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:08,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:08,721 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:08,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:08,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:08,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:08,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:08,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:08,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:08,735 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:08,736 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:08,756 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:08,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:08,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:08,773 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:08,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:09,488 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 393 proven. 465 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:09,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:09,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 00:12:09,508 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:09,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 00:12:09,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 00:12:09,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 00:12:09,509 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand 18 states. [2018-10-27 00:12:09,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:09,562 INFO L93 Difference]: Finished difference Result 137 states and 152 transitions. [2018-10-27 00:12:09,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 00:12:09,563 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 97 [2018-10-27 00:12:09,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:09,563 INFO L225 Difference]: With dead ends: 137 [2018-10-27 00:12:09,563 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 00:12:09,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 00:12:09,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 00:12:09,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-27 00:12:09,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 00:12:09,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2018-10-27 00:12:09,572 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 97 [2018-10-27 00:12:09,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:09,573 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2018-10-27 00:12:09,573 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 00:12:09,573 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2018-10-27 00:12:09,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 00:12:09,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:09,574 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:09,574 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:09,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:09,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1544725810, now seen corresponding path program 16 times [2018-10-27 00:12:09,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:09,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:09,576 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:09,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:09,576 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:09,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:09,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:09,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:09,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:09,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:09,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:09,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:09,897 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:09,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:09,907 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:09,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:09,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:09,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:09,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:10,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 418 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:10,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:10,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 00:12:10,706 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:10,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 00:12:10,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 00:12:10,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 00:12:10,707 INFO L87 Difference]: Start difference. First operand 102 states and 109 transitions. Second operand 19 states. [2018-10-27 00:12:10,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:10,835 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2018-10-27 00:12:10,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 00:12:10,836 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2018-10-27 00:12:10,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:10,836 INFO L225 Difference]: With dead ends: 141 [2018-10-27 00:12:10,837 INFO L226 Difference]: Without dead ends: 107 [2018-10-27 00:12:10,837 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 00:12:10,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-27 00:12:10,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2018-10-27 00:12:10,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-27 00:12:10,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 113 transitions. [2018-10-27 00:12:10,841 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 113 transitions. Word has length 101 [2018-10-27 00:12:10,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:10,842 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 113 transitions. [2018-10-27 00:12:10,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 00:12:10,842 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 113 transitions. [2018-10-27 00:12:10,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-27 00:12:10,846 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:10,846 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:10,846 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:10,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:10,847 INFO L82 PathProgramCache]: Analyzing trace with hash 566696032, now seen corresponding path program 17 times [2018-10-27 00:12:10,847 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:10,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:10,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:10,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:10,848 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:11,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 443 proven. 595 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-27 00:12:11,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:11,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:11,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:11,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:11,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:11,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:11,037 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:11,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:11,065 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-27 00:12:11,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:11,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:11,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 743 proven. 157 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2018-10-27 00:12:11,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:11,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 743 proven. 157 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2018-10-27 00:12:11,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:11,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10, 10] total 28 [2018-10-27 00:12:11,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:11,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 00:12:11,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 00:12:11,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=522, Unknown=0, NotChecked=0, Total=756 [2018-10-27 00:12:11,353 INFO L87 Difference]: Start difference. First operand 106 states and 113 transitions. Second operand 28 states. [2018-10-27 00:12:11,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:11,671 INFO L93 Difference]: Finished difference Result 174 states and 197 transitions. [2018-10-27 00:12:11,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 00:12:11,671 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 105 [2018-10-27 00:12:11,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:11,672 INFO L225 Difference]: With dead ends: 174 [2018-10-27 00:12:11,672 INFO L226 Difference]: Without dead ends: 140 [2018-10-27 00:12:11,673 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 189 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=790, Invalid=1966, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 00:12:11,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-10-27 00:12:11,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 114. [2018-10-27 00:12:11,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-27 00:12:11,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2018-10-27 00:12:11,680 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 105 [2018-10-27 00:12:11,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:11,680 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2018-10-27 00:12:11,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 00:12:11,680 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2018-10-27 00:12:11,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-27 00:12:11,681 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:11,681 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:11,681 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:11,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:11,681 INFO L82 PathProgramCache]: Analyzing trace with hash -223399430, now seen corresponding path program 18 times [2018-10-27 00:12:11,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:11,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:11,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:11,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:11,682 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:11,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:12,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:12,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:12,531 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:12,531 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:12,531 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:12,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:12,531 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:12,541 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:12,541 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:12,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:12,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:12,584 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:12,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:12,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:12,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 543 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:12,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:12,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 00:12:12,997 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:12,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 00:12:12,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 00:12:12,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 00:12:12,998 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand 21 states. [2018-10-27 00:12:13,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:13,060 INFO L93 Difference]: Finished difference Result 157 states and 174 transitions. [2018-10-27 00:12:13,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 00:12:13,062 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 113 [2018-10-27 00:12:13,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:13,063 INFO L225 Difference]: With dead ends: 157 [2018-10-27 00:12:13,063 INFO L226 Difference]: Without dead ends: 119 [2018-10-27 00:12:13,063 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 00:12:13,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-27 00:12:13,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2018-10-27 00:12:13,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-27 00:12:13,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 126 transitions. [2018-10-27 00:12:13,070 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 126 transitions. Word has length 113 [2018-10-27 00:12:13,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:13,070 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 126 transitions. [2018-10-27 00:12:13,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 00:12:13,070 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 126 transitions. [2018-10-27 00:12:13,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 00:12:13,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:13,071 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 26, 19, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:13,071 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:13,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:13,072 INFO L82 PathProgramCache]: Analyzing trace with hash -2116399064, now seen corresponding path program 19 times [2018-10-27 00:12:13,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:13,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:13,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:13,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:13,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:13,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:13,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:13,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:13,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:13,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:13,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:13,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:13,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:13,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:13,369 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:13,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:13,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:13,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:13,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:13,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 572 proven. 741 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:13,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:13,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 00:12:13,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:13,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 00:12:13,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 00:12:13,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 00:12:13,810 INFO L87 Difference]: Start difference. First operand 118 states and 126 transitions. Second operand 22 states. [2018-10-27 00:12:13,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:13,853 INFO L93 Difference]: Finished difference Result 161 states and 178 transitions. [2018-10-27 00:12:13,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 00:12:13,855 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 117 [2018-10-27 00:12:13,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:13,856 INFO L225 Difference]: With dead ends: 161 [2018-10-27 00:12:13,856 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 00:12:13,856 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 00:12:13,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 00:12:13,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-27 00:12:13,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 00:12:13,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2018-10-27 00:12:13,863 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 117 [2018-10-27 00:12:13,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:13,863 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2018-10-27 00:12:13,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 00:12:13,863 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2018-10-27 00:12:13,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-27 00:12:13,864 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:13,864 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:13,865 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:13,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:13,865 INFO L82 PathProgramCache]: Analyzing trace with hash 751740758, now seen corresponding path program 20 times [2018-10-27 00:12:13,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:13,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:13,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:13,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:13,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:13,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 601 proven. 820 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-27 00:12:14,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:14,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:14,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:14,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:14,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:14,127 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:14,136 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:14,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:14,167 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-27 00:12:14,167 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:14,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:14,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1009 proven. 211 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2018-10-27 00:12:14,322 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:14,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1009 proven. 211 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2018-10-27 00:12:14,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:14,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11, 11] total 32 [2018-10-27 00:12:14,569 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:14,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 00:12:14,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 00:12:14,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=685, Unknown=0, NotChecked=0, Total=992 [2018-10-27 00:12:14,570 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand 32 states. [2018-10-27 00:12:14,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:14,912 INFO L93 Difference]: Finished difference Result 198 states and 224 transitions. [2018-10-27 00:12:14,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 00:12:14,912 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 121 [2018-10-27 00:12:14,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:14,913 INFO L225 Difference]: With dead ends: 198 [2018-10-27 00:12:14,913 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 00:12:14,915 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 218 SyntacticMatches, 16 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1011 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1039, Invalid=2621, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 00:12:14,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 00:12:14,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 130. [2018-10-27 00:12:14,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-27 00:12:14,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 139 transitions. [2018-10-27 00:12:14,923 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 139 transitions. Word has length 121 [2018-10-27 00:12:14,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:14,924 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 139 transitions. [2018-10-27 00:12:14,924 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 00:12:14,924 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 139 transitions. [2018-10-27 00:12:14,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-27 00:12:14,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:14,928 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 21, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:14,928 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:14,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:14,929 INFO L82 PathProgramCache]: Analyzing trace with hash 702953968, now seen corresponding path program 21 times [2018-10-27 00:12:14,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:14,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:14,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:14,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:14,930 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:14,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:15,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:15,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:15,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:15,251 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:15,252 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:15,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:15,252 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:15,259 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:15,260 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:15,284 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:15,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:15,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:15,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:15,771 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 717 proven. 903 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:15,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:15,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 00:12:15,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:15,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 00:12:15,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 00:12:15,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 00:12:15,791 INFO L87 Difference]: Start difference. First operand 130 states and 139 transitions. Second operand 24 states. [2018-10-27 00:12:15,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:15,951 INFO L93 Difference]: Finished difference Result 177 states and 196 transitions. [2018-10-27 00:12:15,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 00:12:15,957 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 129 [2018-10-27 00:12:15,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:15,958 INFO L225 Difference]: With dead ends: 177 [2018-10-27 00:12:15,958 INFO L226 Difference]: Without dead ends: 135 [2018-10-27 00:12:15,961 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 00:12:15,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-27 00:12:15,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-10-27 00:12:15,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-10-27 00:12:15,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 143 transitions. [2018-10-27 00:12:15,974 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 143 transitions. Word has length 129 [2018-10-27 00:12:15,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:15,974 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 143 transitions. [2018-10-27 00:12:15,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 00:12:15,975 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 143 transitions. [2018-10-27 00:12:15,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-10-27 00:12:15,975 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:15,975 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 30, 22, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:15,976 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:15,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:15,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1771781150, now seen corresponding path program 22 times [2018-10-27 00:12:15,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:15,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:15,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:15,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:15,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:15,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:16,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:16,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:16,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:16,444 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:16,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:16,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:16,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:16,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:16,453 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:16,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:16,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:16,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:16,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:17,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1860 backedges. 750 proven. 990 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:17,068 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:17,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 00:12:17,068 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:17,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 00:12:17,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 00:12:17,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 00:12:17,069 INFO L87 Difference]: Start difference. First operand 134 states and 143 transitions. Second operand 25 states. [2018-10-27 00:12:17,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:17,122 INFO L93 Difference]: Finished difference Result 181 states and 200 transitions. [2018-10-27 00:12:17,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 00:12:17,123 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-10-27 00:12:17,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:17,124 INFO L225 Difference]: With dead ends: 181 [2018-10-27 00:12:17,124 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 00:12:17,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 00:12:17,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 00:12:17,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-27 00:12:17,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 00:12:17,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 147 transitions. [2018-10-27 00:12:17,133 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 147 transitions. Word has length 133 [2018-10-27 00:12:17,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:17,133 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 147 transitions. [2018-10-27 00:12:17,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 00:12:17,133 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 147 transitions. [2018-10-27 00:12:17,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 00:12:17,134 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:17,134 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 23, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:17,135 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:17,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:17,135 INFO L82 PathProgramCache]: Analyzing trace with hash -444106932, now seen corresponding path program 23 times [2018-10-27 00:12:17,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:17,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:17,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:17,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:17,136 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:17,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:17,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 783 proven. 1081 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-27 00:12:17,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:17,486 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:17,486 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:17,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:17,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:17,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:17,497 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:17,497 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:17,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 00:12:17,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:17,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:17,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 1315 proven. 273 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2018-10-27 00:12:17,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:17,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1984 backedges. 1315 proven. 273 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2018-10-27 00:12:17,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:17,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12, 12] total 36 [2018-10-27 00:12:17,934 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:17,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 00:12:17,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 00:12:17,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=870, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 00:12:17,935 INFO L87 Difference]: Start difference. First operand 138 states and 147 transitions. Second operand 36 states. [2018-10-27 00:12:18,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:18,369 INFO L93 Difference]: Finished difference Result 222 states and 251 transitions. [2018-10-27 00:12:18,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 00:12:18,370 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 137 [2018-10-27 00:12:18,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:18,371 INFO L225 Difference]: With dead ends: 222 [2018-10-27 00:12:18,371 INFO L226 Difference]: Without dead ends: 180 [2018-10-27 00:12:18,372 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 247 SyntacticMatches, 18 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1308 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1322, Invalid=3370, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 00:12:18,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-27 00:12:18,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 146. [2018-10-27 00:12:18,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-27 00:12:18,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 156 transitions. [2018-10-27 00:12:18,384 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 156 transitions. Word has length 137 [2018-10-27 00:12:18,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:18,386 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 156 transitions. [2018-10-27 00:12:18,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 00:12:18,386 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 156 transitions. [2018-10-27 00:12:18,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-10-27 00:12:18,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:18,387 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 33, 24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:18,387 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:18,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:18,388 INFO L82 PathProgramCache]: Analyzing trace with hash 368968422, now seen corresponding path program 24 times [2018-10-27 00:12:18,388 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:18,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:18,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:18,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:18,389 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:18,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:18,696 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:18,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:18,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:18,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:18,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:18,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:18,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:18,705 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:18,706 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:18,735 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:18,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:18,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:18,761 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:18,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:19,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2244 backedges. 915 proven. 1176 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:19,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:19,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 00:12:19,434 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:19,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 00:12:19,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 00:12:19,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:19,435 INFO L87 Difference]: Start difference. First operand 146 states and 156 transitions. Second operand 27 states. [2018-10-27 00:12:19,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:19,503 INFO L93 Difference]: Finished difference Result 197 states and 218 transitions. [2018-10-27 00:12:19,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 00:12:19,514 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-10-27 00:12:19,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:19,515 INFO L225 Difference]: With dead ends: 197 [2018-10-27 00:12:19,515 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 00:12:19,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:19,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 00:12:19,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-27 00:12:19,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 00:12:19,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 160 transitions. [2018-10-27 00:12:19,530 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 160 transitions. Word has length 145 [2018-10-27 00:12:19,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:19,530 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 160 transitions. [2018-10-27 00:12:19,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 00:12:19,531 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 160 transitions. [2018-10-27 00:12:19,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-27 00:12:19,531 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:19,531 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 25, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:19,532 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:19,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:19,532 INFO L82 PathProgramCache]: Analyzing trace with hash 502589716, now seen corresponding path program 25 times [2018-10-27 00:12:19,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:19,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:19,538 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:19,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:19,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:19,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:20,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:20,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:20,039 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:20,039 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:20,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:20,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:20,040 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-27 00:12:20,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:20,057 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:20,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:20,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:20,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:20,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:20,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 952 proven. 1275 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:20,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:20,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2018-10-27 00:12:20,922 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:20,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 00:12:20,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 00:12:20,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:20,924 INFO L87 Difference]: Start difference. First operand 150 states and 160 transitions. Second operand 28 states. [2018-10-27 00:12:21,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:21,133 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2018-10-27 00:12:21,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 00:12:21,141 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 149 [2018-10-27 00:12:21,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:21,142 INFO L225 Difference]: With dead ends: 201 [2018-10-27 00:12:21,142 INFO L226 Difference]: Without dead ends: 155 [2018-10-27 00:12:21,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 273 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:21,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-10-27 00:12:21,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2018-10-27 00:12:21,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-27 00:12:21,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 164 transitions. [2018-10-27 00:12:21,157 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 164 transitions. Word has length 149 [2018-10-27 00:12:21,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:21,158 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 164 transitions. [2018-10-27 00:12:21,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 00:12:21,158 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 164 transitions. [2018-10-27 00:12:21,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 00:12:21,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:21,159 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 35, 26, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:21,164 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:21,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:21,164 INFO L82 PathProgramCache]: Analyzing trace with hash -426702782, now seen corresponding path program 26 times [2018-10-27 00:12:21,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:21,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:21,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:21,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:21,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:21,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:22,025 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 989 proven. 1378 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-27 00:12:22,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:22,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:22,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:22,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:22,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:22,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:22,035 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:22,035 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:22,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 00:12:22,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:22,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:22,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 1661 proven. 343 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2018-10-27 00:12:22,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2520 backedges. 1661 proven. 343 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2018-10-27 00:12:23,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:23,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 13, 13] total 40 [2018-10-27 00:12:23,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:23,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 00:12:23,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 00:12:23,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=1077, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 00:12:23,571 INFO L87 Difference]: Start difference. First operand 154 states and 164 transitions. Second operand 40 states. [2018-10-27 00:12:24,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:24,319 INFO L93 Difference]: Finished difference Result 246 states and 278 transitions. [2018-10-27 00:12:24,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 00:12:24,320 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 153 [2018-10-27 00:12:24,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:24,322 INFO L225 Difference]: With dead ends: 246 [2018-10-27 00:12:24,322 INFO L226 Difference]: Without dead ends: 200 [2018-10-27 00:12:24,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 276 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1643 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1639, Invalid=4213, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 00:12:24,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-27 00:12:24,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 162. [2018-10-27 00:12:24,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-27 00:12:24,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 173 transitions. [2018-10-27 00:12:24,341 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 173 transitions. Word has length 153 [2018-10-27 00:12:24,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:24,341 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 173 transitions. [2018-10-27 00:12:24,341 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 00:12:24,341 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 173 transitions. [2018-10-27 00:12:24,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-27 00:12:24,342 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:24,342 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 27, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:24,343 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:24,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:24,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2049569572, now seen corresponding path program 27 times [2018-10-27 00:12:24,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:24,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:24,344 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:24,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:24,344 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:24,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:25,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:25,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:25,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:25,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:25,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:25,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:25,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:25,285 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:25,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:25,316 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:25,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:25,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:25,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:25,347 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1137 proven. 1485 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:26,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:26,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2018-10-27 00:12:26,043 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:26,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 00:12:26,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 00:12:26,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:26,044 INFO L87 Difference]: Start difference. First operand 162 states and 173 transitions. Second operand 30 states. [2018-10-27 00:12:26,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:26,140 INFO L93 Difference]: Finished difference Result 217 states and 240 transitions. [2018-10-27 00:12:26,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 00:12:26,149 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 161 [2018-10-27 00:12:26,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:26,151 INFO L225 Difference]: With dead ends: 217 [2018-10-27 00:12:26,151 INFO L226 Difference]: Without dead ends: 167 [2018-10-27 00:12:26,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 295 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:26,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-27 00:12:26,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2018-10-27 00:12:26,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-27 00:12:26,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 177 transitions. [2018-10-27 00:12:26,168 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 177 transitions. Word has length 161 [2018-10-27 00:12:26,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:26,168 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 177 transitions. [2018-10-27 00:12:26,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 00:12:26,172 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 177 transitions. [2018-10-27 00:12:26,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 00:12:26,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:26,173 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 28, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:26,173 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:26,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:26,173 INFO L82 PathProgramCache]: Analyzing trace with hash -37300470, now seen corresponding path program 28 times [2018-10-27 00:12:26,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:26,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:26,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:26,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:26,174 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:26,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:27,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:27,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:27,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:27,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:27,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:27,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:27,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:27,118 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:27,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:27,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:27,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:27,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:28,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1178 proven. 1596 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:28,123 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:28,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 52 [2018-10-27 00:12:28,124 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:28,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 00:12:28,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 00:12:28,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:28,125 INFO L87 Difference]: Start difference. First operand 166 states and 177 transitions. Second operand 31 states. [2018-10-27 00:12:28,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:28,283 INFO L93 Difference]: Finished difference Result 221 states and 244 transitions. [2018-10-27 00:12:28,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 00:12:28,284 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 165 [2018-10-27 00:12:28,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:28,285 INFO L225 Difference]: With dead ends: 221 [2018-10-27 00:12:28,285 INFO L226 Difference]: Without dead ends: 171 [2018-10-27 00:12:28,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 302 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:28,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-10-27 00:12:28,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2018-10-27 00:12:28,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-10-27 00:12:28,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 181 transitions. [2018-10-27 00:12:28,299 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 181 transitions. Word has length 165 [2018-10-27 00:12:28,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:28,299 INFO L481 AbstractCegarLoop]: Abstraction has 170 states and 181 transitions. [2018-10-27 00:12:28,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 00:12:28,299 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 181 transitions. [2018-10-27 00:12:28,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-10-27 00:12:28,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:28,300 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 39, 29, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:28,300 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:28,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:28,301 INFO L82 PathProgramCache]: Analyzing trace with hash 516610616, now seen corresponding path program 29 times [2018-10-27 00:12:28,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:28,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:28,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:28,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:28,302 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:28,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:28,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1219 proven. 1711 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-27 00:12:28,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:28,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:28,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:28,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:28,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:28,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:28,787 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:28,787 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:28,873 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 00:12:28,874 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:28,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:29,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 2047 proven. 421 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2018-10-27 00:12:29,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:29,517 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 2047 proven. 421 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2018-10-27 00:12:29,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:29,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 14, 14] total 44 [2018-10-27 00:12:29,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:29,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 00:12:29,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 00:12:29,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=586, Invalid=1306, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 00:12:29,542 INFO L87 Difference]: Start difference. First operand 170 states and 181 transitions. Second operand 44 states. [2018-10-27 00:12:30,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:30,148 INFO L93 Difference]: Finished difference Result 270 states and 305 transitions. [2018-10-27 00:12:30,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 00:12:30,150 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 169 [2018-10-27 00:12:30,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:30,151 INFO L225 Difference]: With dead ends: 270 [2018-10-27 00:12:30,151 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 00:12:30,151 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 305 SyntacticMatches, 22 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1990, Invalid=5150, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 00:12:30,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 00:12:30,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 178. [2018-10-27 00:12:30,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-27 00:12:30,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2018-10-27 00:12:30,170 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 169 [2018-10-27 00:12:30,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:30,171 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2018-10-27 00:12:30,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 00:12:30,171 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2018-10-27 00:12:30,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-27 00:12:30,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:30,172 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 41, 30, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:30,172 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:30,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:30,172 INFO L82 PathProgramCache]: Analyzing trace with hash 2089670610, now seen corresponding path program 30 times [2018-10-27 00:12:30,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:30,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:30,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:30,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:30,178 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:30,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:30,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:30,975 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:30,975 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:30,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:30,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:30,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-27 00:12:30,994 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:30,994 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:31,064 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:31,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:31,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:31,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:31,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:31,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3444 backedges. 1383 proven. 1830 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:31,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:31,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2018-10-27 00:12:31,723 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:31,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 00:12:31,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 00:12:31,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:31,724 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand 33 states. [2018-10-27 00:12:31,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:31,782 INFO L93 Difference]: Finished difference Result 237 states and 262 transitions. [2018-10-27 00:12:31,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 00:12:31,790 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 177 [2018-10-27 00:12:31,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:31,791 INFO L225 Difference]: With dead ends: 237 [2018-10-27 00:12:31,791 INFO L226 Difference]: Without dead ends: 183 [2018-10-27 00:12:31,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 324 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:31,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-27 00:12:31,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 182. [2018-10-27 00:12:31,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-27 00:12:31,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 194 transitions. [2018-10-27 00:12:31,808 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 194 transitions. Word has length 177 [2018-10-27 00:12:31,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:31,808 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 194 transitions. [2018-10-27 00:12:31,808 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 00:12:31,812 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 194 transitions. [2018-10-27 00:12:31,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-10-27 00:12:31,812 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:31,813 INFO L375 BasicCegarLoop]: trace histogram [43, 43, 42, 31, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:31,813 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:31,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:31,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1674541568, now seen corresponding path program 31 times [2018-10-27 00:12:31,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:31,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:31,814 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:31,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:31,814 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:31,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:32,544 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:32,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:32,544 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:32,544 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:32,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:32,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:32,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:32,553 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:32,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:32,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:32,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:32,609 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:32,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:33,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3612 backedges. 1428 proven. 1953 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:33,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:33,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2018-10-27 00:12:33,257 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:33,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 00:12:33,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 00:12:33,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:33,258 INFO L87 Difference]: Start difference. First operand 182 states and 194 transitions. Second operand 34 states. [2018-10-27 00:12:33,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:33,472 INFO L93 Difference]: Finished difference Result 241 states and 266 transitions. [2018-10-27 00:12:33,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 00:12:33,477 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 181 [2018-10-27 00:12:33,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:33,478 INFO L225 Difference]: With dead ends: 241 [2018-10-27 00:12:33,478 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 00:12:33,478 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 331 SyntacticMatches, 14 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:33,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 00:12:33,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-27 00:12:33,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-27 00:12:33,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 198 transitions. [2018-10-27 00:12:33,496 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 198 transitions. Word has length 181 [2018-10-27 00:12:33,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:33,496 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 198 transitions. [2018-10-27 00:12:33,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 00:12:33,496 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 198 transitions. [2018-10-27 00:12:33,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-27 00:12:33,501 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:33,501 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 32, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:33,502 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:33,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:33,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1319867090, now seen corresponding path program 32 times [2018-10-27 00:12:33,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:33,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:33,503 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:33,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:33,503 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:33,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:34,431 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1473 proven. 2080 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-27 00:12:34,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:34,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:34,432 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:34,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:34,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:34,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/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 [2018-10-27 00:12:34,441 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:34,441 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:34,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 00:12:34,488 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:34,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:34,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 2473 proven. 507 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-10-27 00:12:34,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:35,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 2473 proven. 507 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-10-27 00:12:35,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:35,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 15, 15] total 48 [2018-10-27 00:12:35,265 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:35,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 00:12:35,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 00:12:35,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=1557, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 00:12:35,266 INFO L87 Difference]: Start difference. First operand 186 states and 198 transitions. Second operand 48 states. [2018-10-27 00:12:35,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:35,917 INFO L93 Difference]: Finished difference Result 294 states and 332 transitions. [2018-10-27 00:12:35,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 00:12:35,918 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 185 [2018-10-27 00:12:35,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:35,919 INFO L225 Difference]: With dead ends: 294 [2018-10-27 00:12:35,919 INFO L226 Difference]: Without dead ends: 240 [2018-10-27 00:12:35,920 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 334 SyntacticMatches, 24 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2427 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2375, Invalid=6181, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 00:12:35,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-27 00:12:35,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 194. [2018-10-27 00:12:35,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-10-27 00:12:35,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 207 transitions. [2018-10-27 00:12:35,937 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 207 transitions. Word has length 185 [2018-10-27 00:12:35,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:35,938 INFO L481 AbstractCegarLoop]: Abstraction has 194 states and 207 transitions. [2018-10-27 00:12:35,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 00:12:35,938 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 207 transitions. [2018-10-27 00:12:35,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-10-27 00:12:35,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:35,939 INFO L375 BasicCegarLoop]: trace histogram [46, 46, 45, 33, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:35,939 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:35,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:35,939 INFO L82 PathProgramCache]: Analyzing trace with hash 293921736, now seen corresponding path program 33 times [2018-10-27 00:12:35,939 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:35,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:35,940 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:35,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:35,940 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:35,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:37,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:37,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:37,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:37,035 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:37,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:37,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:37,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/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 [2018-10-27 00:12:37,043 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:37,043 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:37,084 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:37,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:37,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:37,107 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:37,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:37,795 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 1653 proven. 2211 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:37,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:37,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 52 [2018-10-27 00:12:37,813 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:37,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 00:12:37,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 00:12:37,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:37,814 INFO L87 Difference]: Start difference. First operand 194 states and 207 transitions. Second operand 36 states. [2018-10-27 00:12:37,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:37,886 INFO L93 Difference]: Finished difference Result 257 states and 284 transitions. [2018-10-27 00:12:37,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 00:12:37,888 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 193 [2018-10-27 00:12:37,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:37,889 INFO L225 Difference]: With dead ends: 257 [2018-10-27 00:12:37,889 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 00:12:37,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 353 SyntacticMatches, 18 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:37,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 00:12:37,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-27 00:12:37,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-27 00:12:37,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 211 transitions. [2018-10-27 00:12:37,907 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 211 transitions. Word has length 193 [2018-10-27 00:12:37,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:37,908 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 211 transitions. [2018-10-27 00:12:37,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 00:12:37,908 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 211 transitions. [2018-10-27 00:12:37,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-27 00:12:37,913 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:37,913 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 34, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:37,913 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:37,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:37,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1601079818, now seen corresponding path program 34 times [2018-10-27 00:12:37,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:37,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:37,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:37,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:37,914 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:37,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:38,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:38,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:38,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:38,374 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:38,374 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:38,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:38,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:38,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:38,383 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:38,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:38,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:38,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:39,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 1702 proven. 2346 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:39,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:39,142 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 52 [2018-10-27 00:12:39,142 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:39,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 00:12:39,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 00:12:39,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:39,143 INFO L87 Difference]: Start difference. First operand 198 states and 211 transitions. Second operand 37 states. [2018-10-27 00:12:39,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:39,232 INFO L93 Difference]: Finished difference Result 261 states and 288 transitions. [2018-10-27 00:12:39,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 00:12:39,233 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 197 [2018-10-27 00:12:39,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:39,234 INFO L225 Difference]: With dead ends: 261 [2018-10-27 00:12:39,234 INFO L226 Difference]: Without dead ends: 203 [2018-10-27 00:12:39,234 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 360 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:39,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-10-27 00:12:39,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2018-10-27 00:12:39,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 00:12:39,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 215 transitions. [2018-10-27 00:12:39,250 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 215 transitions. Word has length 197 [2018-10-27 00:12:39,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:39,251 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 215 transitions. [2018-10-27 00:12:39,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 00:12:39,251 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 215 transitions. [2018-10-27 00:12:39,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-27 00:12:39,252 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:39,252 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 35, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:39,252 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:39,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:39,252 INFO L82 PathProgramCache]: Analyzing trace with hash -712163036, now seen corresponding path program 35 times [2018-10-27 00:12:39,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:39,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:39,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:39,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:39,259 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:39,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:41,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 1751 proven. 2485 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-27 00:12:41,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:41,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:41,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:41,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:41,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:41,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:41,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:41,658 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:41,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-27 00:12:41,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:41,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:41,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2939 proven. 601 refuted. 0 times theorem prover too weak. 972 trivial. 0 not checked. [2018-10-27 00:12:41,969 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:42,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2939 proven. 601 refuted. 0 times theorem prover too weak. 972 trivial. 0 not checked. [2018-10-27 00:12:42,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:42,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 16, 16] total 52 [2018-10-27 00:12:42,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:42,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 00:12:42,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 00:12:42,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=1830, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:42,411 INFO L87 Difference]: Start difference. First operand 202 states and 215 transitions. Second operand 52 states. [2018-10-27 00:12:43,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:43,163 INFO L93 Difference]: Finished difference Result 318 states and 359 transitions. [2018-10-27 00:12:43,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 00:12:43,164 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 201 [2018-10-27 00:12:43,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:43,165 INFO L225 Difference]: With dead ends: 318 [2018-10-27 00:12:43,165 INFO L226 Difference]: Without dead ends: 260 [2018-10-27 00:12:43,166 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 363 SyntacticMatches, 26 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2876 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2794, Invalid=7306, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 00:12:43,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2018-10-27 00:12:43,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 210. [2018-10-27 00:12:43,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-27 00:12:43,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 224 transitions. [2018-10-27 00:12:43,188 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 224 transitions. Word has length 201 [2018-10-27 00:12:43,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:43,188 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 224 transitions. [2018-10-27 00:12:43,188 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 00:12:43,188 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 224 transitions. [2018-10-27 00:12:43,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-27 00:12:43,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:43,194 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 36, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:43,194 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:43,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:43,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1348120766, now seen corresponding path program 36 times [2018-10-27 00:12:43,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:43,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:43,195 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:43,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:43,195 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:43,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:44,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:44,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:44,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:44,512 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:44,512 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:44,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:44,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:44,522 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:44,522 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:44,559 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:44,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:44,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:44,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:44,603 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:45,367 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1947 proven. 2628 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:45,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:45,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 52 [2018-10-27 00:12:45,385 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:45,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 00:12:45,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 00:12:45,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:45,386 INFO L87 Difference]: Start difference. First operand 210 states and 224 transitions. Second operand 39 states. [2018-10-27 00:12:45,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:45,494 INFO L93 Difference]: Finished difference Result 277 states and 306 transitions. [2018-10-27 00:12:45,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 00:12:45,495 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 209 [2018-10-27 00:12:45,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:45,496 INFO L225 Difference]: With dead ends: 277 [2018-10-27 00:12:45,496 INFO L226 Difference]: Without dead ends: 215 [2018-10-27 00:12:45,497 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 382 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:45,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-10-27 00:12:45,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2018-10-27 00:12:45,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-27 00:12:45,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 228 transitions. [2018-10-27 00:12:45,512 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 228 transitions. Word has length 209 [2018-10-27 00:12:45,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:45,512 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 228 transitions. [2018-10-27 00:12:45,512 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 00:12:45,512 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 228 transitions. [2018-10-27 00:12:45,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-27 00:12:45,513 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:45,513 INFO L375 BasicCegarLoop]: trace histogram [51, 51, 50, 37, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:45,513 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:45,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:45,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1500961044, now seen corresponding path program 37 times [2018-10-27 00:12:45,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:45,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:45,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:45,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:45,514 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:45,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:46,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:46,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:46,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:46,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:46,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:46,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:46,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:46,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:46,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:46,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:46,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:46,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:46,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:47,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2000 proven. 2775 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:47,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:47,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-10-27 00:12:47,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:47,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 00:12:47,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 00:12:47,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:47,963 INFO L87 Difference]: Start difference. First operand 214 states and 228 transitions. Second operand 40 states. [2018-10-27 00:12:48,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:48,051 INFO L93 Difference]: Finished difference Result 281 states and 310 transitions. [2018-10-27 00:12:48,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 00:12:48,052 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 213 [2018-10-27 00:12:48,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:48,053 INFO L225 Difference]: With dead ends: 281 [2018-10-27 00:12:48,053 INFO L226 Difference]: Without dead ends: 219 [2018-10-27 00:12:48,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 389 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:48,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-27 00:12:48,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2018-10-27 00:12:48,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2018-10-27 00:12:48,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 232 transitions. [2018-10-27 00:12:48,074 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 232 transitions. Word has length 213 [2018-10-27 00:12:48,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:48,074 INFO L481 AbstractCegarLoop]: Abstraction has 218 states and 232 transitions. [2018-10-27 00:12:48,074 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 00:12:48,074 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 232 transitions. [2018-10-27 00:12:48,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-10-27 00:12:48,075 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:48,075 INFO L375 BasicCegarLoop]: trace histogram [52, 52, 51, 38, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:48,075 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:48,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:48,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1223371238, now seen corresponding path program 38 times [2018-10-27 00:12:48,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:48,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:48,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:48,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:48,077 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:48,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2053 proven. 2926 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-27 00:12:48,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:48,889 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:48,889 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:48,889 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:48,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:48,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:48,899 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:48,899 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:48,950 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-27 00:12:48,950 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:48,952 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:49,410 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 3445 proven. 703 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2018-10-27 00:12:49,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:49,939 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 3445 proven. 703 refuted. 0 times theorem prover too weak. 1156 trivial. 0 not checked. [2018-10-27 00:12:49,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:49,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 17, 17] total 56 [2018-10-27 00:12:49,956 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:49,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 00:12:49,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 00:12:49,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2125, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 00:12:49,957 INFO L87 Difference]: Start difference. First operand 218 states and 232 transitions. Second operand 56 states. [2018-10-27 00:12:50,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:50,755 INFO L93 Difference]: Finished difference Result 342 states and 386 transitions. [2018-10-27 00:12:50,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 00:12:50,756 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 217 [2018-10-27 00:12:50,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:50,757 INFO L225 Difference]: With dead ends: 342 [2018-10-27 00:12:50,757 INFO L226 Difference]: Without dead ends: 280 [2018-10-27 00:12:50,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 392 SyntacticMatches, 28 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3363 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3247, Invalid=8525, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 00:12:50,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2018-10-27 00:12:50,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 226. [2018-10-27 00:12:50,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 00:12:50,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 241 transitions. [2018-10-27 00:12:50,785 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 241 transitions. Word has length 217 [2018-10-27 00:12:50,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:50,786 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 241 transitions. [2018-10-27 00:12:50,786 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 00:12:50,786 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 241 transitions. [2018-10-27 00:12:50,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-27 00:12:50,787 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:50,787 INFO L375 BasicCegarLoop]: trace histogram [54, 54, 53, 39, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:50,787 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:50,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:50,787 INFO L82 PathProgramCache]: Analyzing trace with hash 418299572, now seen corresponding path program 39 times [2018-10-27 00:12:50,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:50,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:50,788 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:50,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:50,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:50,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:52,007 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:52,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:52,007 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:52,008 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:52,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:52,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:52,008 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:52,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:52,017 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:52,056 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:52,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:52,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:52,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:52,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:52,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2265 proven. 3081 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:52,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:52,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 52 [2018-10-27 00:12:52,938 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:52,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 00:12:52,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 00:12:52,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:52,939 INFO L87 Difference]: Start difference. First operand 226 states and 241 transitions. Second operand 42 states. [2018-10-27 00:12:53,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:53,036 INFO L93 Difference]: Finished difference Result 297 states and 328 transitions. [2018-10-27 00:12:53,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 00:12:53,037 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-27 00:12:53,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:53,038 INFO L225 Difference]: With dead ends: 297 [2018-10-27 00:12:53,038 INFO L226 Difference]: Without dead ends: 231 [2018-10-27 00:12:53,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 411 SyntacticMatches, 30 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:53,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-10-27 00:12:53,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 230. [2018-10-27 00:12:53,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-10-27 00:12:53,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 245 transitions. [2018-10-27 00:12:53,059 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 245 transitions. Word has length 225 [2018-10-27 00:12:53,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:53,059 INFO L481 AbstractCegarLoop]: Abstraction has 230 states and 245 transitions. [2018-10-27 00:12:53,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 00:12:53,059 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 245 transitions. [2018-10-27 00:12:53,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-10-27 00:12:53,060 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:53,060 INFO L375 BasicCegarLoop]: trace histogram [55, 55, 54, 40, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:53,060 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:53,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:53,061 INFO L82 PathProgramCache]: Analyzing trace with hash 502733026, now seen corresponding path program 40 times [2018-10-27 00:12:53,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:53,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:53,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:53,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:53,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:53,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:53,659 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:53,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:53,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:53,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:53,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:53,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:53,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:53,669 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:53,669 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:12:53,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:53,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:53,737 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:53,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:54,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2322 proven. 3240 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:54,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:54,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 52 [2018-10-27 00:12:54,441 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:54,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 00:12:54,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 00:12:54,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:54,442 INFO L87 Difference]: Start difference. First operand 230 states and 245 transitions. Second operand 43 states. [2018-10-27 00:12:54,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:54,542 INFO L93 Difference]: Finished difference Result 301 states and 332 transitions. [2018-10-27 00:12:54,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 00:12:54,543 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 229 [2018-10-27 00:12:54,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:54,544 INFO L225 Difference]: With dead ends: 301 [2018-10-27 00:12:54,544 INFO L226 Difference]: Without dead ends: 235 [2018-10-27 00:12:54,545 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 418 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-10-27 00:12:54,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 234. [2018-10-27 00:12:54,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-10-27 00:12:54,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 249 transitions. [2018-10-27 00:12:54,562 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 249 transitions. Word has length 229 [2018-10-27 00:12:54,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:54,563 INFO L481 AbstractCegarLoop]: Abstraction has 234 states and 249 transitions. [2018-10-27 00:12:54,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 00:12:54,563 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 249 transitions. [2018-10-27 00:12:54,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-10-27 00:12:54,564 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:54,564 INFO L375 BasicCegarLoop]: trace histogram [56, 56, 55, 41, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:54,564 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:54,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:54,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1439345680, now seen corresponding path program 41 times [2018-10-27 00:12:54,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:54,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:54,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:12:54,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:54,572 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:54,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:55,796 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2379 proven. 3403 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-27 00:12:55,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:55,796 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:55,796 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:55,796 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:55,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:55,797 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:55,805 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:12:55,805 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:12:55,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-27 00:12:55,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:55,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:56,265 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 3991 proven. 813 refuted. 0 times theorem prover too weak. 1356 trivial. 0 not checked. [2018-10-27 00:12:56,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:56,809 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 3991 proven. 813 refuted. 0 times theorem prover too weak. 1356 trivial. 0 not checked. [2018-10-27 00:12:56,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:56,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 18, 18] total 60 [2018-10-27 00:12:56,825 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:56,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 00:12:56,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 00:12:56,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1098, Invalid=2442, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 00:12:56,826 INFO L87 Difference]: Start difference. First operand 234 states and 249 transitions. Second operand 60 states. [2018-10-27 00:12:57,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:12:57,660 INFO L93 Difference]: Finished difference Result 366 states and 413 transitions. [2018-10-27 00:12:57,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-27 00:12:57,661 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 233 [2018-10-27 00:12:57,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:12:57,662 INFO L225 Difference]: With dead ends: 366 [2018-10-27 00:12:57,662 INFO L226 Difference]: Without dead ends: 300 [2018-10-27 00:12:57,663 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 421 SyntacticMatches, 30 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3888 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3734, Invalid=9838, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 00:12:57,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2018-10-27 00:12:57,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 242. [2018-10-27 00:12:57,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-10-27 00:12:57,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 258 transitions. [2018-10-27 00:12:57,686 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 258 transitions. Word has length 233 [2018-10-27 00:12:57,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:12:57,687 INFO L481 AbstractCegarLoop]: Abstraction has 242 states and 258 transitions. [2018-10-27 00:12:57,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 00:12:57,687 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 258 transitions. [2018-10-27 00:12:57,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2018-10-27 00:12:57,688 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:12:57,688 INFO L375 BasicCegarLoop]: trace histogram [58, 58, 57, 42, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:12:57,688 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:12:57,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:12:57,688 INFO L82 PathProgramCache]: Analyzing trace with hash -10449494, now seen corresponding path program 42 times [2018-10-27 00:12:57,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:12:57,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:57,689 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:12:57,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:12:57,689 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:12:57,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:12:58,399 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:12:58,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:58,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:12:58,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:12:58,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:12:58,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:12:58,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:12:58,409 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:12:58,409 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:12:58,447 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:12:58,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:12:58,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:12:58,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:12:58,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:12:59,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6612 backedges. 2607 proven. 3570 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:12:59,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:12:59,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 52 [2018-10-27 00:12:59,361 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:12:59,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 00:12:59,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 00:12:59,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:12:59,362 INFO L87 Difference]: Start difference. First operand 242 states and 258 transitions. Second operand 45 states. [2018-10-27 00:13:00,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:00,279 INFO L93 Difference]: Finished difference Result 317 states and 350 transitions. [2018-10-27 00:13:00,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 00:13:00,281 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 241 [2018-10-27 00:13:00,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:00,282 INFO L225 Difference]: With dead ends: 317 [2018-10-27 00:13:00,282 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 00:13:00,282 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 440 SyntacticMatches, 36 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:00,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 00:13:00,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 246. [2018-10-27 00:13:00,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-27 00:13:00,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 262 transitions. [2018-10-27 00:13:00,303 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 262 transitions. Word has length 241 [2018-10-27 00:13:00,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:00,304 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 262 transitions. [2018-10-27 00:13:00,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 00:13:00,304 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 262 transitions. [2018-10-27 00:13:00,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-27 00:13:00,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:00,311 INFO L375 BasicCegarLoop]: trace histogram [59, 59, 58, 43, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:00,311 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:00,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:00,312 INFO L82 PathProgramCache]: Analyzing trace with hash 721079256, now seen corresponding path program 43 times [2018-10-27 00:13:00,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:00,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:00,312 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:00,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:00,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:00,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:13:01,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:01,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:01,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:01,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:01,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:01,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:01,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:01,068 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:13:01,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:01,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:01,206 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:13:01,207 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:02,349 INFO L134 CoverageAnalysis]: Checked inductivity of 6844 backedges. 2668 proven. 3741 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:13:02,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:02,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 52 [2018-10-27 00:13:02,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:02,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 00:13:02,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 00:13:02,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:02,367 INFO L87 Difference]: Start difference. First operand 246 states and 262 transitions. Second operand 46 states. [2018-10-27 00:13:02,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:02,485 INFO L93 Difference]: Finished difference Result 321 states and 354 transitions. [2018-10-27 00:13:02,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 00:13:02,486 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 245 [2018-10-27 00:13:02,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:02,487 INFO L225 Difference]: With dead ends: 321 [2018-10-27 00:13:02,487 INFO L226 Difference]: Without dead ends: 251 [2018-10-27 00:13:02,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 447 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:02,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-10-27 00:13:02,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2018-10-27 00:13:02,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2018-10-27 00:13:02,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 266 transitions. [2018-10-27 00:13:02,504 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 266 transitions. Word has length 245 [2018-10-27 00:13:02,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:02,505 INFO L481 AbstractCegarLoop]: Abstraction has 250 states and 266 transitions. [2018-10-27 00:13:02,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 00:13:02,505 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 266 transitions. [2018-10-27 00:13:02,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2018-10-27 00:13:02,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:02,506 INFO L375 BasicCegarLoop]: trace histogram [60, 60, 59, 44, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:02,506 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:02,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:02,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1708016390, now seen corresponding path program 44 times [2018-10-27 00:13:02,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:02,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:02,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:02,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:02,507 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:02,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:03,317 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 2729 proven. 3916 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-27 00:13:03,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:03,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:03,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:03,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:03,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:03,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:03,328 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:13:03,328 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:13:03,386 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-10-27 00:13:03,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:03,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:03,845 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 4577 proven. 931 refuted. 0 times theorem prover too weak. 1572 trivial. 0 not checked. [2018-10-27 00:13:03,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:04,484 INFO L134 CoverageAnalysis]: Checked inductivity of 7080 backedges. 4577 proven. 931 refuted. 0 times theorem prover too weak. 1572 trivial. 0 not checked. [2018-10-27 00:13:04,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:04,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 19, 19] total 64 [2018-10-27 00:13:04,500 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:04,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 00:13:04,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 00:13:04,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1251, Invalid=2781, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 00:13:04,502 INFO L87 Difference]: Start difference. First operand 250 states and 266 transitions. Second operand 64 states. [2018-10-27 00:13:05,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:05,385 INFO L93 Difference]: Finished difference Result 390 states and 440 transitions. [2018-10-27 00:13:05,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-10-27 00:13:05,386 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 249 [2018-10-27 00:13:05,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:05,388 INFO L225 Difference]: With dead ends: 390 [2018-10-27 00:13:05,388 INFO L226 Difference]: Without dead ends: 320 [2018-10-27 00:13:05,389 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 450 SyntacticMatches, 32 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4451 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=4255, Invalid=11245, Unknown=0, NotChecked=0, Total=15500 [2018-10-27 00:13:05,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2018-10-27 00:13:05,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 258. [2018-10-27 00:13:05,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2018-10-27 00:13:05,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 275 transitions. [2018-10-27 00:13:05,415 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 275 transitions. Word has length 249 [2018-10-27 00:13:05,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:05,416 INFO L481 AbstractCegarLoop]: Abstraction has 258 states and 275 transitions. [2018-10-27 00:13:05,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 00:13:05,416 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 275 transitions. [2018-10-27 00:13:05,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2018-10-27 00:13:05,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:05,417 INFO L375 BasicCegarLoop]: trace histogram [62, 62, 61, 45, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:05,417 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:05,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:05,418 INFO L82 PathProgramCache]: Analyzing trace with hash 739220896, now seen corresponding path program 45 times [2018-10-27 00:13:05,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:05,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:05,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:05,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:05,418 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:05,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:06,279 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:06,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:06,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:06,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:06,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:06,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:06,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:06,288 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:13:06,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:13:06,329 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:13:06,329 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:06,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:06,373 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:06,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:07,126 INFO L134 CoverageAnalysis]: Checked inductivity of 7564 backedges. 2973 proven. 4095 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:07,144 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:07,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 52 [2018-10-27 00:13:07,144 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:07,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 00:13:07,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 00:13:07,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:07,145 INFO L87 Difference]: Start difference. First operand 258 states and 275 transitions. Second operand 48 states. [2018-10-27 00:13:07,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:07,269 INFO L93 Difference]: Finished difference Result 337 states and 372 transitions. [2018-10-27 00:13:07,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 00:13:07,270 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 257 [2018-10-27 00:13:07,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:07,272 INFO L225 Difference]: With dead ends: 337 [2018-10-27 00:13:07,272 INFO L226 Difference]: Without dead ends: 263 [2018-10-27 00:13:07,272 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 469 SyntacticMatches, 42 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:07,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-10-27 00:13:07,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2018-10-27 00:13:07,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-27 00:13:07,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 279 transitions. [2018-10-27 00:13:07,292 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 279 transitions. Word has length 257 [2018-10-27 00:13:07,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:07,293 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 279 transitions. [2018-10-27 00:13:07,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 00:13:07,293 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 279 transitions. [2018-10-27 00:13:07,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 00:13:07,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:07,294 INFO L375 BasicCegarLoop]: trace histogram [63, 63, 62, 46, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:07,294 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:07,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:07,295 INFO L82 PathProgramCache]: Analyzing trace with hash -2047623218, now seen corresponding path program 46 times [2018-10-27 00:13:07,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:07,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:07,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:07,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:07,295 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:07,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:08,137 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:08,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:08,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:08,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:08,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:08,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:08,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:08,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:08,148 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:13:08,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:08,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:08,236 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:08,236 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:09,031 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3038 proven. 4278 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:09,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:09,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2018-10-27 00:13:09,049 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:09,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 00:13:09,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 00:13:09,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:09,050 INFO L87 Difference]: Start difference. First operand 262 states and 279 transitions. Second operand 49 states. [2018-10-27 00:13:09,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:09,486 INFO L93 Difference]: Finished difference Result 341 states and 376 transitions. [2018-10-27 00:13:09,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 00:13:09,487 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 261 [2018-10-27 00:13:09,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:09,488 INFO L225 Difference]: With dead ends: 341 [2018-10-27 00:13:09,488 INFO L226 Difference]: Without dead ends: 267 [2018-10-27 00:13:09,489 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 476 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:09,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-27 00:13:09,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 266. [2018-10-27 00:13:09,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2018-10-27 00:13:09,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 283 transitions. [2018-10-27 00:13:09,514 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 283 transitions. Word has length 261 [2018-10-27 00:13:09,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:09,515 INFO L481 AbstractCegarLoop]: Abstraction has 266 states and 283 transitions. [2018-10-27 00:13:09,515 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 00:13:09,515 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 283 transitions. [2018-10-27 00:13:09,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2018-10-27 00:13:09,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:09,516 INFO L375 BasicCegarLoop]: trace histogram [64, 64, 63, 47, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:09,516 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:09,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:09,524 INFO L82 PathProgramCache]: Analyzing trace with hash 796859132, now seen corresponding path program 47 times [2018-10-27 00:13:09,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:09,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:09,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:09,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:09,525 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:09,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:10,527 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 3103 proven. 4465 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-27 00:13:10,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:10,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:10,527 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:10,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:10,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:10,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:10,538 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:13:10,538 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:13:10,605 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-10-27 00:13:10,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:10,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 5203 proven. 1057 refuted. 0 times theorem prover too weak. 1804 trivial. 0 not checked. [2018-10-27 00:13:11,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:12,421 INFO L134 CoverageAnalysis]: Checked inductivity of 8064 backedges. 5203 proven. 1057 refuted. 0 times theorem prover too weak. 1804 trivial. 0 not checked. [2018-10-27 00:13:12,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:12,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 20, 20] total 68 [2018-10-27 00:13:12,439 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:12,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-27 00:13:12,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-27 00:13:12,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1414, Invalid=3142, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 00:13:12,441 INFO L87 Difference]: Start difference. First operand 266 states and 283 transitions. Second operand 68 states. [2018-10-27 00:13:13,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:13,454 INFO L93 Difference]: Finished difference Result 414 states and 467 transitions. [2018-10-27 00:13:13,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-27 00:13:13,456 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 265 [2018-10-27 00:13:13,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:13,457 INFO L225 Difference]: With dead ends: 414 [2018-10-27 00:13:13,457 INFO L226 Difference]: Without dead ends: 340 [2018-10-27 00:13:13,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 479 SyntacticMatches, 34 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5052 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4810, Invalid=12746, Unknown=0, NotChecked=0, Total=17556 [2018-10-27 00:13:13,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2018-10-27 00:13:13,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 274. [2018-10-27 00:13:13,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-27 00:13:13,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 292 transitions. [2018-10-27 00:13:13,486 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 292 transitions. Word has length 265 [2018-10-27 00:13:13,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:13,487 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 292 transitions. [2018-10-27 00:13:13,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-27 00:13:13,487 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 292 transitions. [2018-10-27 00:13:13,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-27 00:13:13,488 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:13,488 INFO L375 BasicCegarLoop]: trace histogram [66, 66, 65, 48, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:13,488 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:13,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:13,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1000042134, now seen corresponding path program 48 times [2018-10-27 00:13:13,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:13,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:13,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:13,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:13,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:13,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:14,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:14,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:14,353 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:14,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:14,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:14,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:14,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:14,364 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:13:14,364 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:13:14,410 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:13:14,411 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:14,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:14,460 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:14,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:15,275 INFO L134 CoverageAnalysis]: Checked inductivity of 8580 backedges. 3363 proven. 4656 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:15,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:15,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2018-10-27 00:13:15,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:15,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 00:13:15,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 00:13:15,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:15,294 INFO L87 Difference]: Start difference. First operand 274 states and 292 transitions. Second operand 51 states. [2018-10-27 00:13:15,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:15,433 INFO L93 Difference]: Finished difference Result 357 states and 394 transitions. [2018-10-27 00:13:15,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 00:13:15,434 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 273 [2018-10-27 00:13:15,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:15,435 INFO L225 Difference]: With dead ends: 357 [2018-10-27 00:13:15,435 INFO L226 Difference]: Without dead ends: 279 [2018-10-27 00:13:15,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 498 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:15,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-27 00:13:15,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2018-10-27 00:13:15,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2018-10-27 00:13:15,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 296 transitions. [2018-10-27 00:13:15,460 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 296 transitions. Word has length 273 [2018-10-27 00:13:15,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:15,460 INFO L481 AbstractCegarLoop]: Abstraction has 278 states and 296 transitions. [2018-10-27 00:13:15,460 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 00:13:15,461 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 296 transitions. [2018-10-27 00:13:15,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2018-10-27 00:13:15,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:15,462 INFO L375 BasicCegarLoop]: trace histogram [67, 67, 66, 49, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:15,462 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:15,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:15,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1535210692, now seen corresponding path program 49 times [2018-10-27 00:13:15,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:15,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:15,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:15,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:15,463 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:15,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:16,309 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:16,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:16,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:16,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:16,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:16,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:16,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:16,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:16,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:13:16,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:16,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:16,410 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:16,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:17,228 INFO L134 CoverageAnalysis]: Checked inductivity of 8844 backedges. 3432 proven. 4851 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-27 00:13:17,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:17,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 52 [2018-10-27 00:13:17,246 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:17,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 00:13:17,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 00:13:17,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:17,247 INFO L87 Difference]: Start difference. First operand 278 states and 296 transitions. Second operand 52 states. [2018-10-27 00:13:17,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:17,371 INFO L93 Difference]: Finished difference Result 376 states and 413 transitions. [2018-10-27 00:13:17,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 00:13:17,372 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 277 [2018-10-27 00:13:17,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:17,373 INFO L225 Difference]: With dead ends: 376 [2018-10-27 00:13:17,373 INFO L226 Difference]: Without dead ends: 298 [2018-10-27 00:13:17,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 505 SyntacticMatches, 50 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 00:13:17,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2018-10-27 00:13:17,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 282. [2018-10-27 00:13:17,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-10-27 00:13:17,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 300 transitions. [2018-10-27 00:13:17,402 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 300 transitions. Word has length 277 [2018-10-27 00:13:17,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:17,402 INFO L481 AbstractCegarLoop]: Abstraction has 282 states and 300 transitions. [2018-10-27 00:13:17,402 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 00:13:17,402 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 300 transitions. [2018-10-27 00:13:17,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2018-10-27 00:13:17,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:17,404 INFO L375 BasicCegarLoop]: trace histogram [68, 68, 67, 50, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:17,404 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:17,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:17,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1870443506, now seen corresponding path program 50 times [2018-10-27 00:13:17,404 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:17,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:17,405 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:17,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:17,405 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:18,791 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 7852 proven. 1191 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2018-10-27 00:13:18,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:18,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:18,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:18,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:18,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:18,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:18,803 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 00:13:18,803 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 00:13:18,872 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-27 00:13:18,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:18,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:18,922 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 5869 proven. 1191 refuted. 0 times theorem prover too weak. 2052 trivial. 0 not checked. [2018-10-27 00:13:18,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:19,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 5869 proven. 1191 refuted. 0 times theorem prover too weak. 2052 trivial. 0 not checked. [2018-10-27 00:13:19,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:19,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 21, 21] total 53 [2018-10-27 00:13:19,530 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:19,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 00:13:19,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 00:13:19,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 00:13:19,531 INFO L87 Difference]: Start difference. First operand 282 states and 300 transitions. Second operand 53 states. [2018-10-27 00:13:20,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:20,469 INFO L93 Difference]: Finished difference Result 2696 states and 3340 transitions. [2018-10-27 00:13:20,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 00:13:20,471 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 281 [2018-10-27 00:13:20,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:20,484 INFO L225 Difference]: With dead ends: 2696 [2018-10-27 00:13:20,484 INFO L226 Difference]: Without dead ends: 2691 [2018-10-27 00:13:20,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 545 SyntacticMatches, 36 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1476 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 00:13:20,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2691 states. [2018-10-27 00:13:20,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2691 to 414. [2018-10-27 00:13:20,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2018-10-27 00:13:20,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 465 transitions. [2018-10-27 00:13:20,653 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 465 transitions. Word has length 281 [2018-10-27 00:13:20,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:20,654 INFO L481 AbstractCegarLoop]: Abstraction has 414 states and 465 transitions. [2018-10-27 00:13:20,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 00:13:20,654 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 465 transitions. [2018-10-27 00:13:20,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2018-10-27 00:13:20,656 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:20,657 INFO L375 BasicCegarLoop]: trace histogram [101, 101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:20,657 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:20,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:20,657 INFO L82 PathProgramCache]: Analyzing trace with hash 2099862750, now seen corresponding path program 51 times [2018-10-27 00:13:20,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:20,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:20,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:20,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:20,658 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:22,213 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-27 00:13:22,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:22,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:22,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:22,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:22,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:22,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:22,223 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 00:13:22,224 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 00:13:22,295 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 00:13:22,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 00:13:22,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:25,377 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 0 proven. 20200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 00:13:25,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:26,041 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 0 proven. 20200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 00:13:26,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:26,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 105, 105] total 109 [2018-10-27 00:13:26,060 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:26,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-10-27 00:13:26,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-10-27 00:13:26,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=11453, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 00:13:26,062 INFO L87 Difference]: Start difference. First operand 414 states and 465 transitions. Second operand 107 states. [2018-10-27 00:13:35,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:35,379 INFO L93 Difference]: Finished difference Result 5829 states and 7257 transitions. [2018-10-27 00:13:35,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-10-27 00:13:35,389 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 413 [2018-10-27 00:13:35,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:35,405 INFO L225 Difference]: With dead ends: 5829 [2018-10-27 00:13:35,406 INFO L226 Difference]: Without dead ends: 5616 [2018-10-27 00:13:35,408 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 771 SyntacticMatches, 4 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=325, Invalid=11665, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 00:13:35,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5616 states. [2018-10-27 00:13:38,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5616 to 5567. [2018-10-27 00:13:38,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5567 states. [2018-10-27 00:13:38,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5567 states to 5567 states and 5667 transitions. [2018-10-27 00:13:38,505 INFO L78 Accepts]: Start accepts. Automaton has 5567 states and 5667 transitions. Word has length 413 [2018-10-27 00:13:38,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:38,506 INFO L481 AbstractCegarLoop]: Abstraction has 5567 states and 5667 transitions. [2018-10-27 00:13:38,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-10-27 00:13:38,506 INFO L276 IsEmpty]: Start isEmpty. Operand 5567 states and 5667 transitions. [2018-10-27 00:13:38,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 418 [2018-10-27 00:13:38,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 00:13:38,508 INFO L375 BasicCegarLoop]: trace histogram [102, 102, 101, 52, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 00:13:38,508 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 00:13:38,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 00:13:38,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1583456842, now seen corresponding path program 52 times [2018-10-27 00:13:38,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 00:13:38,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:38,517 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 00:13:38,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 00:13:38,517 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 00:13:38,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:39,540 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-27 00:13:39,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:39,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 00:13:39,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 00:13:39,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 00:13:39,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 00:13:39,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 00:13:39,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 00:13:39,551 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 00:13:39,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 00:13:39,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 00:13:39,761 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-27 00:13:39,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 00:13:41,476 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-27 00:13:41,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 00:13:41,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 54 [2018-10-27 00:13:41,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 00:13:41,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 00:13:41,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 00:13:41,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 00:13:41,496 INFO L87 Difference]: Start difference. First operand 5567 states and 5667 transitions. Second operand 54 states. [2018-10-27 00:13:42,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 00:13:42,107 INFO L93 Difference]: Finished difference Result 5768 states and 5868 transitions. [2018-10-27 00:13:42,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-27 00:13:42,109 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 417 [2018-10-27 00:13:42,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 00:13:42,109 INFO L225 Difference]: With dead ends: 5768 [2018-10-27 00:13:42,109 INFO L226 Difference]: Without dead ends: 0 [2018-10-27 00:13:42,120 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 783 SyntacticMatches, 102 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2950 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 00:13:42,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-27 00:13:42,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-27 00:13:42,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-27 00:13:42,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-27 00:13:42,121 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 417 [2018-10-27 00:13:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 00:13:42,121 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-27 00:13:42,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 00:13:42,122 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-27 00:13:42,122 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-27 00:13:42,134 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-27 00:13:46,936 WARN L179 SmtUtils]: Spent 4.79 s on a formula simplification. DAG size of input: 1559 DAG size of output: 1042 [2018-10-27 00:13:52,313 WARN L179 SmtUtils]: Spent 5.32 s on a formula simplification. DAG size of input: 887 DAG size of output: 459 [2018-10-27 00:13:52,326 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-27 00:13:52,326 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-27 00:13:52,326 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-27 00:13:52,326 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-27 00:13:52,326 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-27 00:13:52,326 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 25) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point L15(lines 15 19) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point L15-2(lines 14 22) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 25) no Hoare annotation was computed. [2018-10-27 00:13:52,327 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 25) the Hoare annotation is: true [2018-10-27 00:13:52,327 INFO L425 ceAbstractionStarter]: For program point L14-1(lines 14 22) no Hoare annotation was computed. [2018-10-27 00:13:52,332 INFO L421 ceAbstractionStarter]: At program point L14-3(lines 14 22) the Hoare annotation is: (let ((.cse13 (<= main_~y~0 40)) (.cse12 (<= 40 main_~y~0)) (.cse28 (<= 31 main_~y~0)) (.cse29 (<= main_~y~0 31)) (.cse23 (<= 28 main_~y~0)) (.cse22 (<= main_~y~0 28)) (.cse8 (<= main_~y~0 6)) (.cse9 (<= 6 main_~y~0)) (.cse3 (<= main_~y~0 15)) (.cse2 (<= 15 main_~y~0)) (.cse32 (<= main_~y~0 36)) (.cse33 (<= 36 main_~y~0)) (.cse42 (<= main_~y~0 13)) (.cse43 (<= 13 main_~y~0)) (.cse30 (<= 8 main_~y~0)) (.cse31 (<= main_~y~0 8)) (.cse16 (<= 44 main_~y~0)) (.cse17 (<= main_~y~0 44)) (.cse18 (<= 37 main_~y~0)) (.cse19 (<= main_~y~0 37)) (.cse36 (<= 0 main_~y~0)) (.cse37 (<= main_~y~0 0)) (.cse20 (<= main_~y~0 4)) (.cse21 (<= 4 main_~y~0)) (.cse45 (<= 47 main_~y~0)) (.cse44 (<= main_~y~0 47)) (.cse55 (<= 48 main_~y~0)) (.cse54 (<= main_~y~0 48)) (.cse70 (<= 25 main_~y~0)) (.cse71 (<= main_~y~0 25)) (.cse40 (<= main_~y~0 10)) (.cse41 (<= 10 main_~y~0)) (.cse67 (<= 26 main_~y~0)) (.cse66 (<= main_~y~0 26)) (.cse68 (<= 35 main_~y~0)) (.cse69 (<= main_~y~0 35)) (.cse48 (<= main_~y~0 16)) (.cse49 (<= 16 main_~y~0)) (.cse63 (<= main_~y~0 32)) (.cse62 (<= 32 main_~y~0)) (.cse50 (<= main_~y~0 21)) (.cse51 (<= 21 main_~y~0)) (.cse34 (<= main_~y~0 45)) (.cse35 (<= 45 main_~y~0)) (.cse52 (<= 38 main_~y~0)) (.cse53 (<= main_~y~0 38)) (.cse76 (<= main_~y~0 9)) (.cse77 (<= 9 main_~y~0)) (.cse78 (<= main_~y~0 3)) (.cse79 (<= 3 main_~y~0)) (.cse38 (<= 30 main_~y~0)) (.cse39 (<= main_~y~0 30)) (.cse82 (<= main_~y~0 42)) (.cse83 (<= 42 main_~y~0)) (.cse15 (<= main_~y~0 14)) (.cse14 (<= 14 main_~y~0)) (.cse4 (<= 46 main_~y~0)) (.cse5 (<= main_~y~0 46)) (.cse0 (<= main_~y~0 2)) (.cse1 (<= 2 main_~y~0)) (.cse64 (<= main_~y~0 12)) (.cse65 (<= 12 main_~y~0)) (.cse58 (<= 19 main_~y~0)) (.cse59 (<= main_~y~0 19)) (.cse75 (<= main_~y~0 24)) (.cse74 (<= 24 main_~y~0)) (.cse88 (<= 22 main_~y~0)) (.cse89 (<= main_~y~0 22)) (.cse57 (<= 11 main_~y~0)) (.cse56 (<= main_~y~0 11)) (.cse25 (<= 17 main_~y~0)) (.cse24 (<= main_~y~0 17)) (.cse90 (<= 34 main_~y~0)) (.cse91 (<= main_~y~0 34)) (.cse84 (<= main_~y~0 41)) (.cse85 (<= 41 main_~y~0)) (.cse81 (<= main_~y~0 27)) (.cse80 (<= 27 main_~y~0)) (.cse6 (<= 1 main_~y~0)) (.cse7 (<= main_~y~0 1)) (.cse26 (<= 33 main_~y~0)) (.cse27 (<= main_~y~0 33)) (.cse87 (<= 5 main_~y~0)) (.cse86 (<= main_~y~0 5)) (.cse46 (<= 23 main_~y~0)) (.cse47 (<= main_~y~0 23)) (.cse73 (<= 29 main_~y~0)) (.cse72 (<= main_~y~0 29)) (.cse60 (<= main_~y~0 7)) (.cse61 (<= 7 main_~y~0)) (.cse96 (<= 43 main_~y~0)) (.cse97 (<= main_~y~0 43)) (.cse92 (<= 18 main_~y~0)) (.cse93 (<= main_~y~0 18)) (.cse94 (<= 20 main_~y~0)) (.cse95 (<= main_~y~0 20)) (.cse10 (<= 49 main_~y~0)) (.cse11 (<= main_~y~0 49)) (.cse99 (<= 39 main_~y~0)) (.cse98 (<= main_~y~0 39))) (or (and (= main_~x~0 2) .cse0 .cse1) (and .cse2 .cse3 (= main_~x~0 15)) (and (= main_~x~0 46) .cse4 .cse5) (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 51) (<= 51 main_~x~0) .cse11) (and (= main_~x~0 40) .cse12 .cse13) (and .cse14 (<= main_~x~0 86) .cse15 (<= 86 main_~x~0)) (and .cse16 (<= main_~x~0 56) .cse17 (<= 56 main_~x~0)) (and (<= 50 main_~x~0) (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and .cse13 (<= main_~x~0 60) (<= 60 main_~x~0) .cse12) (and (= main_~x~0 37) .cse18 .cse19) (and .cse20 .cse21 (= main_~x~0 4)) (and .cse22 (<= 72 main_~x~0) .cse23 (<= main_~x~0 72)) (and .cse24 (<= 83 main_~x~0) (<= main_~x~0 83) .cse25) (and .cse26 (= main_~x~0 33) .cse27) (and .cse28 (<= main_~x~0 69) (<= 69 main_~x~0) .cse29) (and (= main_~x~0 31) .cse28 .cse29) (and (= main_~x~0 8) .cse30 .cse31) (and .cse23 .cse22 (= main_~x~0 28)) (and (= main_~x~0 6) .cse8 .cse9) (and .cse32 .cse33 (= main_~x~0 36)) (and .cse34 (<= main_~x~0 55) (<= 55 main_~x~0) .cse35) (and (= main_~x~0 0) .cse36 .cse37) (and (= main_~x~0 30) .cse38 .cse39) (and .cse40 .cse41 (<= 90 main_~x~0) (<= main_~x~0 90)) (and .cse3 (<= main_~x~0 85) (<= 85 main_~x~0) .cse2) (and .cse42 (<= main_~x~0 87) (<= 87 main_~x~0) .cse43) (and .cse44 (<= 53 main_~x~0) (<= main_~x~0 53) .cse45) (and (<= main_~x~0 64) .cse32 (<= 64 main_~x~0) .cse33) (and (= main_~x~0 13) .cse42 .cse43) (and .cse46 .cse47 (<= 77 main_~x~0) (<= main_~x~0 77)) (and .cse48 .cse49 (= main_~x~0 16)) (and (<= main_~x~0 92) .cse30 .cse31 (<= 92 main_~x~0)) (and (= main_~x~0 44) .cse16 .cse17) (and (<= 63 main_~x~0) .cse18 (<= main_~x~0 63) .cse19) (and (<= main_~x~0 100) .cse36 (<= 100 main_~x~0) .cse37) (and .cse50 .cse51 (= main_~x~0 21)) (and (<= 62 main_~x~0) .cse52 (<= main_~x~0 62) .cse53) (and .cse54 .cse55 (= main_~x~0 48)) (and .cse56 .cse57 (<= 89 main_~x~0) (<= main_~x~0 89)) (and .cse20 .cse21 (<= main_~x~0 96) (<= 96 main_~x~0)) (and .cse58 (= main_~x~0 19) .cse59) (and (<= 93 main_~x~0) .cse60 (<= main_~x~0 93) .cse61) (and (<= 68 main_~x~0) .cse62 (<= main_~x~0 68) .cse63) (and (= main_~x~0 47) .cse45 .cse44) (and (<= main_~x~0 88) (<= 88 main_~x~0) .cse64 .cse65) (and .cse55 .cse54 (<= main_~x~0 52) (<= 52 main_~x~0)) (and (<= 74 main_~x~0) (<= main_~x~0 74) .cse66 .cse67) (and .cse68 .cse69 (<= 65 main_~x~0) (<= main_~x~0 65)) (and .cse70 (<= main_~x~0 75) (<= 75 main_~x~0) .cse71) (and .cse72 .cse73 (= main_~x~0 29)) (and .cse74 .cse75 (= main_~x~0 24)) (and (= main_~x~0 25) .cse70 .cse71) (and .cse40 .cse41 (= main_~x~0 10)) (and (= main_~x~0 26) .cse67 .cse66) (and .cse68 (= main_~x~0 35) .cse69) (and .cse48 (<= 84 main_~x~0) .cse49 (<= main_~x~0 84)) (and .cse63 .cse62 (= main_~x~0 32)) (and (<= main_~x~0 91) (<= 91 main_~x~0) .cse76 .cse77) (and (<= 97 main_~x~0) .cse78 .cse79 (<= main_~x~0 97)) (and .cse80 (<= main_~x~0 73) (<= 73 main_~x~0) .cse81) (and .cse50 (<= main_~x~0 79) (<= 79 main_~x~0) .cse51) (and .cse34 .cse35 (= main_~x~0 45)) (and .cse82 .cse83 (= main_~x~0 42)) (and .cse84 .cse85 (<= 59 main_~x~0) (<= main_~x~0 59)) (and (<= main_~x~0 95) .cse86 .cse87 (<= 95 main_~x~0)) (and .cse52 (= main_~x~0 38) .cse53) (and (= main_~x~0 9) .cse76 .cse77) (and .cse78 .cse79 (= main_~x~0 3)) (and (= main_~x~0 22) .cse88 .cse89) (and (= main_~x~0 34) .cse90 .cse91) (and (<= main_~x~0 70) .cse38 .cse39 (<= 70 main_~x~0)) (and (<= 58 main_~x~0) .cse82 (<= main_~x~0 58) .cse83) (and .cse15 (= main_~x~0 14) .cse14) (and (<= 54 main_~x~0) .cse4 (<= main_~x~0 54) .cse5) (and .cse92 .cse93 (<= 82 main_~x~0) (<= main_~x~0 82)) (and .cse0 (<= main_~x~0 98) .cse1 (<= 98 main_~x~0)) (and .cse64 .cse65 (= main_~x~0 12)) (and (<= main_~x~0 81) .cse58 (<= 81 main_~x~0) .cse59) (and .cse75 (<= 76 main_~x~0) (<= main_~x~0 76) .cse74) (and (<= main_~x~0 78) .cse88 .cse89 (<= 78 main_~x~0)) (and (= main_~x~0 20) .cse94 .cse95) (and .cse57 .cse56 (= main_~x~0 11)) (and .cse25 (= main_~x~0 17) .cse24) (and .cse90 .cse91 (<= 66 main_~x~0) (<= main_~x~0 66)) (and .cse84 (= main_~x~0 41) .cse85) (and (= main_~x~0 27) .cse81 .cse80) (and (= main_~x~0 1) .cse6 .cse7) (and .cse26 .cse27 (<= 67 main_~x~0) (<= main_~x~0 67)) (and (<= 57 main_~x~0) .cse96 (<= main_~x~0 57) .cse97) (and .cse87 (= main_~x~0 5) .cse86) (and .cse46 (= main_~x~0 23) .cse47) (and .cse73 .cse72 (<= 71 main_~x~0) (<= main_~x~0 71)) (and (= main_~x~0 7) .cse60 .cse61) (and (= main_~x~0 43) .cse96 .cse97) (and .cse92 (= main_~x~0 18) .cse93) (and .cse98 (= main_~x~0 39) .cse99) (and .cse94 (<= 80 main_~x~0) (<= main_~x~0 80) .cse95) (and .cse10 (= main_~x~0 49) .cse11) (and (<= 61 main_~x~0) .cse99 .cse98 (<= main_~x~0 61)))) [2018-10-27 00:13:52,332 INFO L421 ceAbstractionStarter]: At program point L14-4(lines 14 22) the Hoare annotation is: (and (<= main_~x~0 100) (<= 100 main_~x~0)) [2018-10-27 00:13:52,332 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-27 00:13:52,332 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-27 00:13:52,333 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-27 00:13:52,333 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-27 00:13:52,333 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-27 00:13:52,333 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-27 00:13:52,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 12:13:52 BoogieIcfgContainer [2018-10-27 00:13:52,393 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 00:13:52,394 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-27 00:13:52,394 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-27 00:13:52,394 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-27 00:13:52,394 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:11:58" (3/4) ... [2018-10-27 00:13:52,398 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-27 00:13:52,405 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-27 00:13:52,405 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-27 00:13:52,405 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-27 00:13:52,409 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2018-10-27 00:13:52,409 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2018-10-27 00:13:52,409 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-27 00:13:52,456 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_c1269cbb-175d-497c-8947-3529add26669/bin-2019/utaipan/witness.graphml [2018-10-27 00:13:52,456 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-27 00:13:52,459 INFO L168 Benchmark]: Toolchain (without parser) took 115093.58 ms. Allocated memory was 1.0 GB in the beginning and 1.8 GB in the end (delta: 741.9 MB). Free memory was 959.7 MB in the beginning and 828.4 MB in the end (delta: 131.2 MB). Peak memory consumption was 873.1 MB. Max. memory is 11.5 GB. [2018-10-27 00:13:52,459 INFO L168 Benchmark]: CDTParser took 0.14 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. [2018-10-27 00:13:52,459 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.69 ms. Allocated memory is still 1.0 GB. Free memory was 959.7 MB in the beginning and 948.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. [2018-10-27 00:13:52,460 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.94 ms. Allocated memory is still 1.0 GB. Free memory is still 948.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-27 00:13:52,460 INFO L168 Benchmark]: Boogie Preprocessor took 25.07 ms. Allocated memory is still 1.0 GB. Free memory is still 948.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-27 00:13:52,460 INFO L168 Benchmark]: RCFGBuilder took 588.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.8 MB). Free memory was 948.8 MB in the beginning and 1.1 GB in the end (delta: -191.9 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. [2018-10-27 00:13:52,461 INFO L168 Benchmark]: TraceAbstraction took 114131.71 ms. Allocated memory was 1.2 GB in the beginning and 1.8 GB in the end (delta: 585.1 MB). Free memory was 1.1 GB in the beginning and 838.9 MB in the end (delta: 301.9 MB). Peak memory consumption was 897.4 MB. Max. memory is 11.5 GB. [2018-10-27 00:13:52,461 INFO L168 Benchmark]: Witness Printer took 62.37 ms. Allocated memory is still 1.8 GB. Free memory was 838.9 MB in the beginning and 828.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 11.5 GB. [2018-10-27 00:13:52,464 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 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 258.69 ms. Allocated memory is still 1.0 GB. Free memory was 959.7 MB in the beginning and 948.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 20.94 ms. Allocated memory is still 1.0 GB. Free memory is still 948.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 25.07 ms. Allocated memory is still 1.0 GB. Free memory is still 948.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 588.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.8 MB). Free memory was 948.8 MB in the beginning and 1.1 GB in the end (delta: -191.9 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 114131.71 ms. Allocated memory was 1.2 GB in the beginning and 1.8 GB in the end (delta: 585.1 MB). Free memory was 1.1 GB in the beginning and 838.9 MB in the end (delta: 301.9 MB). Peak memory consumption was 897.4 MB. Max. memory is 11.5 GB. * Witness Printer took 62.37 ms. Allocated memory is still 1.8 GB. Free memory was 838.9 MB in the beginning and 828.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 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: (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((x == 2 && y <= 2) && 2 <= y) || ((15 <= y && y <= 15) && x == 15)) || ((x == 46 && 46 <= y) && y <= 46)) || (((x <= 99 && 1 <= y) && y <= 1) && 99 <= x)) || (((94 <= x && y <= 6) && x <= 94) && 6 <= y)) || (((49 <= y && x <= 51) && 51 <= x) && y <= 49)) || ((x == 40 && 40 <= y) && y <= 40)) || (((14 <= y && x <= 86) && y <= 14) && 86 <= x)) || (((44 <= y && x <= 56) && y <= 44) && 56 <= x)) || (((50 <= x && y <= 50) && x <= 50) && 50 <= y)) || (((y <= 40 && x <= 60) && 60 <= x) && 40 <= y)) || ((x == 37 && 37 <= y) && y <= 37)) || ((y <= 4 && 4 <= y) && x == 4)) || (((y <= 28 && 72 <= x) && 28 <= y) && x <= 72)) || (((y <= 17 && 83 <= x) && x <= 83) && 17 <= y)) || ((33 <= y && x == 33) && y <= 33)) || (((31 <= y && x <= 69) && 69 <= x) && y <= 31)) || ((x == 31 && 31 <= y) && y <= 31)) || ((x == 8 && 8 <= y) && y <= 8)) || ((28 <= y && y <= 28) && x == 28)) || ((x == 6 && y <= 6) && 6 <= y)) || ((y <= 36 && 36 <= y) && x == 36)) || (((y <= 45 && x <= 55) && 55 <= x) && 45 <= y)) || ((x == 0 && 0 <= y) && y <= 0)) || ((x == 30 && 30 <= y) && y <= 30)) || (((y <= 10 && 10 <= y) && 90 <= x) && x <= 90)) || (((y <= 15 && x <= 85) && 85 <= x) && 15 <= y)) || (((y <= 13 && x <= 87) && 87 <= x) && 13 <= y)) || (((y <= 47 && 53 <= x) && x <= 53) && 47 <= y)) || (((x <= 64 && y <= 36) && 64 <= x) && 36 <= y)) || ((x == 13 && y <= 13) && 13 <= y)) || (((23 <= y && y <= 23) && 77 <= x) && x <= 77)) || ((y <= 16 && 16 <= y) && x == 16)) || (((x <= 92 && 8 <= y) && y <= 8) && 92 <= x)) || ((x == 44 && 44 <= y) && y <= 44)) || (((63 <= x && 37 <= y) && x <= 63) && y <= 37)) || (((x <= 100 && 0 <= y) && 100 <= x) && y <= 0)) || ((y <= 21 && 21 <= y) && x == 21)) || (((62 <= x && 38 <= y) && x <= 62) && y <= 38)) || ((y <= 48 && 48 <= y) && x == 48)) || (((y <= 11 && 11 <= y) && 89 <= x) && x <= 89)) || (((y <= 4 && 4 <= y) && x <= 96) && 96 <= x)) || ((19 <= y && x == 19) && y <= 19)) || (((93 <= x && y <= 7) && x <= 93) && 7 <= y)) || (((68 <= x && 32 <= y) && x <= 68) && y <= 32)) || ((x == 47 && 47 <= y) && y <= 47)) || (((x <= 88 && 88 <= x) && y <= 12) && 12 <= y)) || (((48 <= y && y <= 48) && x <= 52) && 52 <= x)) || (((74 <= x && x <= 74) && y <= 26) && 26 <= y)) || (((35 <= y && y <= 35) && 65 <= x) && x <= 65)) || (((25 <= y && x <= 75) && 75 <= x) && y <= 25)) || ((y <= 29 && 29 <= y) && x == 29)) || ((24 <= y && y <= 24) && x == 24)) || ((x == 25 && 25 <= y) && y <= 25)) || ((y <= 10 && 10 <= y) && x == 10)) || ((x == 26 && 26 <= y) && y <= 26)) || ((35 <= y && x == 35) && y <= 35)) || (((y <= 16 && 84 <= x) && 16 <= y) && x <= 84)) || ((y <= 32 && 32 <= y) && x == 32)) || (((x <= 91 && 91 <= x) && y <= 9) && 9 <= y)) || (((97 <= x && y <= 3) && 3 <= y) && x <= 97)) || (((27 <= y && x <= 73) && 73 <= x) && y <= 27)) || (((y <= 21 && x <= 79) && 79 <= x) && 21 <= y)) || ((y <= 45 && 45 <= y) && x == 45)) || ((y <= 42 && 42 <= y) && x == 42)) || (((y <= 41 && 41 <= y) && 59 <= x) && x <= 59)) || (((x <= 95 && y <= 5) && 5 <= y) && 95 <= x)) || ((38 <= y && x == 38) && y <= 38)) || ((x == 9 && y <= 9) && 9 <= y)) || ((y <= 3 && 3 <= y) && x == 3)) || ((x == 22 && 22 <= y) && y <= 22)) || ((x == 34 && 34 <= y) && y <= 34)) || (((x <= 70 && 30 <= y) && y <= 30) && 70 <= x)) || (((58 <= x && y <= 42) && x <= 58) && 42 <= y)) || ((y <= 14 && x == 14) && 14 <= y)) || (((54 <= x && 46 <= y) && x <= 54) && y <= 46)) || (((18 <= y && y <= 18) && 82 <= x) && x <= 82)) || (((y <= 2 && x <= 98) && 2 <= y) && 98 <= x)) || ((y <= 12 && 12 <= y) && x == 12)) || (((x <= 81 && 19 <= y) && 81 <= x) && y <= 19)) || (((y <= 24 && 76 <= x) && x <= 76) && 24 <= y)) || (((x <= 78 && 22 <= y) && y <= 22) && 78 <= x)) || ((x == 20 && 20 <= y) && y <= 20)) || ((11 <= y && y <= 11) && x == 11)) || ((17 <= y && x == 17) && y <= 17)) || (((34 <= y && y <= 34) && 66 <= x) && x <= 66)) || ((y <= 41 && x == 41) && 41 <= y)) || ((x == 27 && y <= 27) && 27 <= y)) || ((x == 1 && 1 <= y) && y <= 1)) || (((33 <= y && y <= 33) && 67 <= x) && x <= 67)) || (((57 <= x && 43 <= y) && x <= 57) && y <= 43)) || ((5 <= y && x == 5) && y <= 5)) || ((23 <= y && x == 23) && y <= 23)) || (((29 <= y && y <= 29) && 71 <= x) && x <= 71)) || ((x == 7 && y <= 7) && 7 <= y)) || ((x == 43 && 43 <= y) && y <= 43)) || ((18 <= y && x == 18) && y <= 18)) || ((y <= 39 && x == 39) && 39 <= y)) || (((20 <= y && 80 <= x) && x <= 80) && y <= 20)) || ((49 <= y && x == 49) && y <= 49)) || (((61 <= x && 39 <= y) && y <= 39) && x <= 61) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 114.0s OverallTime, 55 OverallIterations, 102 TraceHistogramMax, 24.7s AutomataDifference, 0.0s DeadEndRemovalTime, 10.2s HoareAnnotationTime, HoareTripleCheckerStatistics: 1402 SDtfs, 1076 SDslu, 36580 SDs, 0 SdLazy, 23932 SolverSat, 1386 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 11.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18946 GetRequests, 15418 SyntacticMatches, 896 SemanticMatches, 2632 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45963 ImplicationChecksByTransitivity, 69.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=5567occurred in iteration=54, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 3.9s AutomataMinimizationTime, 55 MinimizatonAttempts, 2951 StatesRemovedByMinimization, 52 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 62 PreInvPairs, 164 NumberOfFragments, 1176 HoareAnnotationTreeSize, 62 FomulaSimplifications, 50095985 FormulaSimplificationTreeSizeReduction, 4.8s HoareSimplificationTime, 7 FomulaSimplificationsInter, 12095 FormulaSimplificationTreeSizeReductionInter, 5.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.3s SatisfiabilityAnalysisTime, 68.8s InterpolantComputationTime, 16860 NumberOfCodeBlocks, 16240 NumberOfCodeBlocksAsserted, 564 NumberOfCheckSat, 25113 ConstructedInterpolants, 0 QuantifiedInterpolants, 13916361 SizeOfPredicates, 69 NumberOfNonLiveVariables, 15740 ConjunctsInSsa, 1584 ConjunctsInUnsatCore, 159 InterpolantComputations, 3 PerfectInterpolantSequences, 318092/604248 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...