./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c --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_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/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 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-11-10 10:24:30,839 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-10 10:24:30,840 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-10 10:24:30,849 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-10 10:24:30,849 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-10 10:24:30,849 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-10 10:24:30,850 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-10 10:24:30,851 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-10 10:24:30,853 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-10 10:24:30,853 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-10 10:24:30,854 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-10 10:24:30,854 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-10 10:24:30,855 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-10 10:24:30,855 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-10 10:24:30,856 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-10 10:24:30,857 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-10 10:24:30,858 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-10 10:24:30,860 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-10 10:24:30,861 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-10 10:24:30,862 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-10 10:24:30,863 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-10 10:24:30,864 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-10 10:24:30,866 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-10 10:24:30,866 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-10 10:24:30,866 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-10 10:24:30,867 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-10 10:24:30,868 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-10 10:24:30,869 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-10 10:24:30,869 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-10 10:24:30,870 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-10 10:24:30,870 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-10 10:24:30,871 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-10 10:24:30,871 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-10 10:24:30,871 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-10 10:24:30,872 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-10 10:24:30,872 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-10 10:24:30,872 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-10 10:24:30,884 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-10 10:24:30,884 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-10 10:24:30,884 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-10 10:24:30,885 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-10 10:24:30,885 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-10 10:24:30,885 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-10 10:24:30,885 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-10 10:24:30,885 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-10 10:24:30,886 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-10 10:24:30,886 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-10 10:24:30,886 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-10 10:24:30,887 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-10 10:24:30,887 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-10 10:24:30,887 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-10 10:24:30,887 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-10 10:24:30,887 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-10 10:24:30,887 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-10 10:24:30,888 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-10 10:24:30,888 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-10 10:24:30,888 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-10 10:24:30,888 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-10 10:24:30,888 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-10 10:24:30,888 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-10 10:24:30,889 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-10 10:24:30,889 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-10 10:24:30,889 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-10 10:24:30,889 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 10:24:30,889 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-10 10:24:30,891 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-10 10:24:30,891 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-10 10:24:30,891 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-10 10:24:30,892 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-10 10:24:30,892 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-10 10:24:30,892 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-10 10:24:30,892 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_61df3548-e941-4687-899b-2dcb951523cd/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 -> 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 [2018-11-10 10:24:30,911 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-10 10:24:30,918 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-10 10:24:30,920 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-10 10:24:30,920 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-10 10:24:30,921 INFO L276 PluginConnector]: CDTParser initialized [2018-11-10 10:24:30,921 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-11-10 10:24:30,957 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/data/0afec70c5/688db087b57f484ea1f246093da1c552/FLAG12e70ba07 [2018-11-10 10:24:31,350 INFO L298 CDTParser]: Found 1 translation units. [2018-11-10 10:24:31,350 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-11-10 10:24:31,355 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/data/0afec70c5/688db087b57f484ea1f246093da1c552/FLAG12e70ba07 [2018-11-10 10:24:31,363 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/data/0afec70c5/688db087b57f484ea1f246093da1c552 [2018-11-10 10:24:31,365 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-10 10:24:31,366 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-10 10:24:31,366 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-10 10:24:31,366 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-10 10:24:31,369 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-10 10:24:31,369 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e712191 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31, skipping insertion in model container [2018-11-10 10:24:31,371 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,376 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-10 10:24:31,385 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-10 10:24:31,469 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 10:24:31,471 INFO L189 MainTranslator]: Completed pre-run [2018-11-10 10:24:31,480 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 10:24:31,488 INFO L193 MainTranslator]: Completed translation [2018-11-10 10:24:31,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31 WrapperNode [2018-11-10 10:24:31,488 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-10 10:24:31,489 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-10 10:24:31,489 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-10 10:24:31,489 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-10 10:24:31,494 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,497 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,500 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-10 10:24:31,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-10 10:24:31,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-10 10:24:31,500 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-10 10:24:31,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,505 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,507 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,509 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... [2018-11-10 10:24:31,510 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-10 10:24:31,510 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-10 10:24:31,510 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-10 10:24:31,511 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-10 10:24:31,511 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 10:24:31,576 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-10 10:24:31,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-10 10:24:31,576 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-10 10:24:31,577 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-10 10:24:31,577 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-10 10:24:31,577 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-10 10:24:31,577 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-10 10:24:31,577 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-10 10:24:31,656 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-10 10:24:31,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 10:24:31 BoogieIcfgContainer [2018-11-10 10:24:31,657 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-10 10:24:31,658 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-10 10:24:31,658 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-10 10:24:31,659 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-10 10:24:31,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.11 10:24:31" (1/3) ... [2018-11-10 10:24:31,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aba5c22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 10:24:31, skipping insertion in model container [2018-11-10 10:24:31,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 10:24:31" (2/3) ... [2018-11-10 10:24:31,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aba5c22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 10:24:31, skipping insertion in model container [2018-11-10 10:24:31,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 10:24:31" (3/3) ... [2018-11-10 10:24:31,662 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_25x0_true-unreach-call_true-termination.c [2018-11-10 10:24:31,667 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-10 10:24:31,672 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-10 10:24:31,680 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-10 10:24:31,704 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-10 10:24:31,704 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-10 10:24:31,704 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-10 10:24:31,704 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-10 10:24:31,704 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-10 10:24:31,704 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-10 10:24:31,704 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-10 10:24:31,705 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-10 10:24:31,718 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-10 10:24:31,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-10 10:24:31,723 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:31,723 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:31,725 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:31,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:31,729 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-10 10:24:31,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:31,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:31,761 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:31,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:31,762 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:31,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:31,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 10:24:31,840 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 10:24:31,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 10:24:31,841 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 10:24:31,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 10:24:31,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 10:24:31,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-10 10:24:31,852 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-10 10:24:31,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:31,904 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-10 10:24:31,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-10 10:24:31,905 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-10 10:24:31,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:31,912 INFO L225 Difference]: With dead ends: 30 [2018-11-10 10:24:31,912 INFO L226 Difference]: Without dead ends: 18 [2018-11-10 10:24:31,915 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-10 10:24:31,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-10 10:24:31,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-10 10:24:31,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-10 10:24:31,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-10 10:24:31,944 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-10 10:24:31,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:31,944 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-10 10:24:31,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 10:24:31,945 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-10 10:24:31,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-10 10:24:31,946 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:31,946 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:31,947 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:31,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:31,947 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-10 10:24:31,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:31,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:31,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:31,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:31,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:31,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:32,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 10:24:32,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:32,011 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-10 10:24:32,012 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-11-10 10:24:32,046 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-10 10:24:32,046 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-10 10:24:32,199 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-10 10:24:32,200 INFO L272 AbstractInterpreter]: Visited 17 different actions 71 times. Never merged. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-11-10 10:24:32,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:32,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-10 10:24:32,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:32,227 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:32,227 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:24:32,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:32,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:32,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 10:24:32,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:32,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-10 10:24:32,462 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:32,463 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-11-10 10:24:32,463 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:32,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-10 10:24:32,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-10 10:24:32,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-11-10 10:24:32,464 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-10 10:24:32,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:32,515 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-10 10:24:32,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-10 10:24:32,515 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-10 10:24:32,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:32,516 INFO L225 Difference]: With dead ends: 25 [2018-11-10 10:24:32,516 INFO L226 Difference]: Without dead ends: 21 [2018-11-10 10:24:32,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-11-10 10:24:32,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-10 10:24:32,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-10 10:24:32,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-10 10:24:32,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-10 10:24:32,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-10 10:24:32,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:32,520 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-10 10:24:32,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-10 10:24:32,520 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-10 10:24:32,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-10 10:24:32,521 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:32,521 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:32,521 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:32,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:32,521 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-10 10:24:32,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:32,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:32,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:32,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:32,522 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:32,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:32,569 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-10 10:24:32,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:32,570 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:32,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:32,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:32,583 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:24:32,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:24:32,594 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-10 10:24:32,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:32,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:32,606 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-10 10:24:32,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:32,839 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-10 10:24:32,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:32,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-11-10 10:24:32,855 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:32,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-10 10:24:32,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-10 10:24:32,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-11-10 10:24:32,856 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-10 10:24:32,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:32,906 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-10 10:24:32,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-10 10:24:32,907 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-10 10:24:32,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:32,907 INFO L225 Difference]: With dead ends: 28 [2018-11-10 10:24:32,908 INFO L226 Difference]: Without dead ends: 24 [2018-11-10 10:24:32,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-11-10 10:24:32,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-10 10:24:32,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-10 10:24:32,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-10 10:24:32,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-10 10:24:32,912 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-10 10:24:32,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:32,912 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-10 10:24:32,912 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-10 10:24:32,913 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-10 10:24:32,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-10 10:24:32,913 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:32,913 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:32,913 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:32,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:32,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-11-10 10:24:32,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:32,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:32,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:32,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:32,915 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:32,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:32,974 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-10 10:24:32,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,975 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:32,975 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:32,975 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:32,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:32,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:32,981 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:24:32,981 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:24:33,005 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:24:33,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:33,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:33,020 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-10 10:24:33,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:33,305 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-10 10:24:33,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:33,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-11-10 10:24:33,321 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:33,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-10 10:24:33,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-10 10:24:33,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-11-10 10:24:33,321 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-10 10:24:33,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:33,354 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-10 10:24:33,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-10 10:24:33,355 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-10 10:24:33,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:33,355 INFO L225 Difference]: With dead ends: 31 [2018-11-10 10:24:33,355 INFO L226 Difference]: Without dead ends: 27 [2018-11-10 10:24:33,356 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-10 10:24:33,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-10 10:24:33,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-10 10:24:33,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-10 10:24:33,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-10 10:24:33,359 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-10 10:24:33,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:33,359 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-10 10:24:33,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-10 10:24:33,359 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-10 10:24:33,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-10 10:24:33,360 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:33,360 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:33,360 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:33,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:33,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-11-10 10:24:33,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:33,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:33,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:33,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:33,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:33,418 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-10 10:24:33,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:33,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:33,419 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:33,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:33,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:33,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:33,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:33,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:24:33,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:33,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:33,446 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-10 10:24:33,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:33,875 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-10 10:24:33,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:33,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-11-10 10:24:33,891 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:33,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-10 10:24:33,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-10 10:24:33,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-11-10 10:24:33,891 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-10 10:24:33,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:33,936 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-10 10:24:33,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-10 10:24:33,936 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-10 10:24:33,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:33,937 INFO L225 Difference]: With dead ends: 34 [2018-11-10 10:24:33,937 INFO L226 Difference]: Without dead ends: 30 [2018-11-10 10:24:33,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-11-10 10:24:33,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-10 10:24:33,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-10 10:24:33,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-10 10:24:33,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-10 10:24:33,940 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-10 10:24:33,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:33,941 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-10 10:24:33,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-10 10:24:33,941 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-10 10:24:33,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-10 10:24:33,941 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:33,941 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:33,941 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:33,941 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:33,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-11-10 10:24:33,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:33,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:33,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:33,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:33,942 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:33,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:34,013 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-10 10:24:34,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:34,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:34,014 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:34,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:34,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:34,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:34,020 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:24:34,020 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:24:34,031 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-10 10:24:34,032 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:34,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:34,046 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-10 10:24:34,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:34,666 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-10 10:24:34,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:34,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-11-10 10:24:34,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:34,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-10 10:24:34,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-10 10:24:34,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-11-10 10:24:34,683 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-10 10:24:34,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:34,740 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-10 10:24:34,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-10 10:24:34,741 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-10 10:24:34,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:34,742 INFO L225 Difference]: With dead ends: 37 [2018-11-10 10:24:34,742 INFO L226 Difference]: Without dead ends: 33 [2018-11-10 10:24:34,742 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-11-10 10:24:34,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-10 10:24:34,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-10 10:24:34,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-10 10:24:34,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-10 10:24:34,746 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-10 10:24:34,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:34,746 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-10 10:24:34,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-10 10:24:34,746 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-10 10:24:34,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-10 10:24:34,747 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:34,747 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:34,747 INFO L424 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:34,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:34,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-11-10 10:24:34,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:34,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:34,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:34,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:34,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:34,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-10 10:24:34,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:34,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:34,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:34,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:34,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:34,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:34,827 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:24:34,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:24:34,845 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:24:34,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:34,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:34,863 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-10 10:24:34,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-10 10:24:35,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:35,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-11-10 10:24:35,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:35,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-10 10:24:35,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-10 10:24:35,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-11-10 10:24:35,668 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-10 10:24:35,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:35,730 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-10 10:24:35,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-10 10:24:35,734 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-10 10:24:35,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:35,734 INFO L225 Difference]: With dead ends: 40 [2018-11-10 10:24:35,734 INFO L226 Difference]: Without dead ends: 36 [2018-11-10 10:24:35,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-11-10 10:24:35,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-10 10:24:35,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-10 10:24:35,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-10 10:24:35,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-10 10:24:35,739 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-10 10:24:35,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:35,740 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-10 10:24:35,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-10 10:24:35,740 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-10 10:24:35,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-10 10:24:35,740 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:35,741 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:35,741 INFO L424 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:35,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:35,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-11-10 10:24:35,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:35,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:35,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:35,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:35,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:35,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:35,816 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-10 10:24:35,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:35,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:35,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:35,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:35,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:35,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:35,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:35,824 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:24:35,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:35,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:35,851 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-10 10:24:35,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:36,956 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-10 10:24:36,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:36,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-11-10 10:24:36,972 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:36,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-10 10:24:36,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-10 10:24:36,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-11-10 10:24:36,972 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-10 10:24:37,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:37,038 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-10 10:24:37,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-10 10:24:37,038 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-10 10:24:37,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:37,039 INFO L225 Difference]: With dead ends: 43 [2018-11-10 10:24:37,039 INFO L226 Difference]: Without dead ends: 39 [2018-11-10 10:24:37,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-11-10 10:24:37,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-10 10:24:37,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-10 10:24:37,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-10 10:24:37,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-10 10:24:37,043 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-10 10:24:37,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:37,043 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-10 10:24:37,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-10 10:24:37,043 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-10 10:24:37,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-10 10:24:37,044 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:37,044 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:37,044 INFO L424 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:37,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:37,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-11-10 10:24:37,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:37,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:37,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:37,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:37,048 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:37,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:37,118 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-10 10:24:37,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:37,118 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:37,118 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:37,118 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:37,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:37,118 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:37,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:24:37,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:24:37,143 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-10 10:24:37,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:37,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:37,167 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-10 10:24:37,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:38,637 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-10 10:24:38,652 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:38,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-11-10 10:24:38,653 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:38,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-10 10:24:38,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-10 10:24:38,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-11-10 10:24:38,654 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-10 10:24:38,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:38,732 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-10 10:24:38,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-10 10:24:38,733 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-10 10:24:38,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:38,733 INFO L225 Difference]: With dead ends: 46 [2018-11-10 10:24:38,734 INFO L226 Difference]: Without dead ends: 42 [2018-11-10 10:24:38,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-11-10 10:24:38,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-10 10:24:38,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-10 10:24:38,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-10 10:24:38,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-10 10:24:38,738 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-10 10:24:38,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:38,738 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-10 10:24:38,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-10 10:24:38,738 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-10 10:24:38,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-10 10:24:38,739 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:38,739 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:38,739 INFO L424 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:38,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:38,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-11-10 10:24:38,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:38,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:38,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:38,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:38,740 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:38,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:38,832 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-10 10:24:38,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:38,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:38,832 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:38,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:38,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:38,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:38,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:24:38,838 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:24:38,851 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:24:38,851 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:38,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:38,865 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-10 10:24:38,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:40,896 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-10 10:24:40,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:40,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-11-10 10:24:40,912 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:40,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-10 10:24:40,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-10 10:24:40,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-11-10 10:24:40,913 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-10 10:24:40,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:40,988 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-10 10:24:40,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-10 10:24:40,989 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-10 10:24:40,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:40,989 INFO L225 Difference]: With dead ends: 49 [2018-11-10 10:24:40,989 INFO L226 Difference]: Without dead ends: 45 [2018-11-10 10:24:40,990 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-11-10 10:24:40,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-10 10:24:40,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-10 10:24:40,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-10 10:24:40,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-10 10:24:40,997 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-10 10:24:40,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:40,997 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-10 10:24:40,997 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-10 10:24:40,997 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-10 10:24:40,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-10 10:24:40,998 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:40,998 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:40,998 INFO L424 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:40,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:40,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-11-10 10:24:40,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:40,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:40,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:40,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:41,000 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:41,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:41,093 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-10 10:24:41,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:41,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:41,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:41,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:41,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:41,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:41,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:41,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:24:41,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:41,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:41,128 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-10 10:24:41,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:43,600 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-10 10:24:43,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:43,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-11-10 10:24:43,616 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:43,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-10 10:24:43,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-10 10:24:43,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-11-10 10:24:43,616 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-10 10:24:43,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:43,710 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-10 10:24:43,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-10 10:24:43,710 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-10 10:24:43,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:43,711 INFO L225 Difference]: With dead ends: 52 [2018-11-10 10:24:43,711 INFO L226 Difference]: Without dead ends: 48 [2018-11-10 10:24:43,712 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-11-10 10:24:43,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-10 10:24:43,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-10 10:24:43,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-10 10:24:43,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-10 10:24:43,717 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-10 10:24:43,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:43,717 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-10 10:24:43,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-10 10:24:43,717 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-10 10:24:43,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-10 10:24:43,718 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:43,718 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:43,719 INFO L424 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:43,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:43,719 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-11-10 10:24:43,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:43,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:43,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:43,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:43,720 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:43,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:43,876 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-10 10:24:43,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:43,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:43,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:43,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:43,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:43,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:43,884 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:24:43,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:24:43,915 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-10 10:24:43,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:43,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:43,931 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-10 10:24:43,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:47,153 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-10 10:24:47,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:47,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-11-10 10:24:47,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:47,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-10 10:24:47,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-10 10:24:47,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-11-10 10:24:47,171 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-10 10:24:47,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:47,326 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-10 10:24:47,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-10 10:24:47,326 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-10 10:24:47,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:47,327 INFO L225 Difference]: With dead ends: 55 [2018-11-10 10:24:47,327 INFO L226 Difference]: Without dead ends: 51 [2018-11-10 10:24:47,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-11-10 10:24:47,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-10 10:24:47,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-10 10:24:47,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-10 10:24:47,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-10 10:24:47,331 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-10 10:24:47,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:47,332 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-10 10:24:47,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-10 10:24:47,332 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-10 10:24:47,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-10 10:24:47,333 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:47,333 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:47,333 INFO L424 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:47,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:47,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-11-10 10:24:47,333 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:47,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:47,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:47,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:47,334 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:47,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:47,430 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-10 10:24:47,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:47,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:47,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:47,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:47,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:47,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:47,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:24:47,438 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:24:47,456 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:24:47,457 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:47,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:47,476 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-10 10:24:47,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:51,703 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-10 10:24:51,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:51,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-11-10 10:24:51,718 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:51,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-10 10:24:51,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-10 10:24:51,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-11-10 10:24:51,719 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-10 10:24:51,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:51,834 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-10 10:24:51,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-10 10:24:51,834 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-10 10:24:51,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:51,835 INFO L225 Difference]: With dead ends: 58 [2018-11-10 10:24:51,835 INFO L226 Difference]: Without dead ends: 54 [2018-11-10 10:24:51,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-11-10 10:24:51,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-10 10:24:51,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-10 10:24:51,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-10 10:24:51,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-10 10:24:51,839 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-10 10:24:51,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:51,840 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-10 10:24:51,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-10 10:24:51,840 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-10 10:24:51,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-10 10:24:51,841 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:51,841 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:51,841 INFO L424 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:51,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:51,841 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-11-10 10:24:51,841 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:51,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:51,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:24:51,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:51,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:51,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-10 10:24:51,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:51,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:51,941 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:51,941 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:51,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:51,941 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:51,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:51,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:24:51,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:51,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:51,974 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-10 10:24:51,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:24:57,027 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-10 10:24:57,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:24:57,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-11-10 10:24:57,043 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:24:57,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-10 10:24:57,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-10 10:24:57,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-11-10 10:24:57,044 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-10 10:24:57,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:24:57,166 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-10 10:24:57,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-10 10:24:57,166 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-10 10:24:57,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:24:57,167 INFO L225 Difference]: With dead ends: 61 [2018-11-10 10:24:57,167 INFO L226 Difference]: Without dead ends: 57 [2018-11-10 10:24:57,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-11-10 10:24:57,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-10 10:24:57,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-10 10:24:57,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-10 10:24:57,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-10 10:24:57,171 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-10 10:24:57,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:24:57,171 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-10 10:24:57,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-10 10:24:57,172 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-10 10:24:57,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-10 10:24:57,172 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:24:57,172 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:24:57,173 INFO L424 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:24:57,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:24:57,173 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-11-10 10:24:57,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:24:57,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:57,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:24:57,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:24:57,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:24:57,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:24:57,342 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-10 10:24:57,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:57,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:24:57,343 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:24:57,343 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:24:57,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:24:57,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:24:57,352 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:24:57,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:24:57,391 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-10 10:24:57,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:24:57,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:24:57,411 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-10 10:24:57,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:25:03,642 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-10 10:25:03,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:25:03,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-11-10 10:25:03,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:25:03,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-10 10:25:03,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-10 10:25:03,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-11-10 10:25:03,664 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-10 10:25:03,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:25:03,818 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-10 10:25:03,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-10 10:25:03,818 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-10 10:25:03,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:25:03,819 INFO L225 Difference]: With dead ends: 64 [2018-11-10 10:25:03,819 INFO L226 Difference]: Without dead ends: 60 [2018-11-10 10:25:03,820 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-11-10 10:25:03,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-10 10:25:03,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-10 10:25:03,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-10 10:25:03,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-10 10:25:03,823 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-10 10:25:03,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:25:03,824 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-10 10:25:03,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-10 10:25:03,824 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-10 10:25:03,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-10 10:25:03,825 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:25:03,825 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:25:03,825 INFO L424 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:25:03,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:25:03,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-11-10 10:25:03,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:25:03,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:03,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:25:03,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:03,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:25:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:03,964 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-10 10:25:03,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:03,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:25:03,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:25:03,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:25:03,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:03,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:25:03,970 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:25:03,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:25:03,989 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:25:03,990 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:25:03,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:25:04,002 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-10 10:25:04,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:25:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-10 10:25:11,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:25:11,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-11-10 10:25:11,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:25:11,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-10 10:25:11,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-10 10:25:11,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-11-10 10:25:11,473 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-11-10 10:25:11,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:25:11,625 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-10 10:25:11,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-10 10:25:11,625 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-11-10 10:25:11,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:25:11,626 INFO L225 Difference]: With dead ends: 67 [2018-11-10 10:25:11,626 INFO L226 Difference]: Without dead ends: 63 [2018-11-10 10:25:11,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-11-10 10:25:11,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-10 10:25:11,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-10 10:25:11,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-10 10:25:11,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-10 10:25:11,630 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-10 10:25:11,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:25:11,631 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-10 10:25:11,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-10 10:25:11,631 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-10 10:25:11,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-10 10:25:11,632 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:25:11,632 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:25:11,632 INFO L424 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:25:11,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:25:11,632 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-11-10 10:25:11,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:25:11,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:11,633 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:25:11,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:11,633 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:25:11,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:11,775 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-10 10:25:11,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:11,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:25:11,776 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:25:11,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:25:11,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:11,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:25:11,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:25:11,781 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:25:11,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:11,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:25:11,829 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-10 10:25:11,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:25:20,831 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-10 10:25:20,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:25:20,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-11-10 10:25:20,848 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:25:20,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-10 10:25:20,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-10 10:25:20,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-11-10 10:25:20,849 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-10 10:25:21,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:25:21,019 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-11-10 10:25:21,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-10 10:25:21,020 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-10 10:25:21,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:25:21,020 INFO L225 Difference]: With dead ends: 70 [2018-11-10 10:25:21,020 INFO L226 Difference]: Without dead ends: 66 [2018-11-10 10:25:21,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-11-10 10:25:21,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-10 10:25:21,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-10 10:25:21,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-10 10:25:21,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-10 10:25:21,025 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-11-10 10:25:21,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:25:21,025 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-10 10:25:21,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-10 10:25:21,025 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-10 10:25:21,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-11-10 10:25:21,025 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:25:21,026 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:25:21,026 INFO L424 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:25:21,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:25:21,026 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2018-11-10 10:25:21,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:25:21,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:21,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:25:21,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:21,027 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:25:21,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:21,182 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-10 10:25:21,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:21,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:25:21,183 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:25:21,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:25:21,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:21,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:25:21,188 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:25:21,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:25:21,221 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-10 10:25:21,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:25:21,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:25:21,246 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-10 10:25:21,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:25:32,013 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-10 10:25:32,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:25:32,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-11-10 10:25:32,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:25:32,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-10 10:25:32,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-10 10:25:32,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-11-10 10:25:32,030 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-11-10 10:25:32,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:25:32,186 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-11-10 10:25:32,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-10 10:25:32,186 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-11-10 10:25:32,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:25:32,187 INFO L225 Difference]: With dead ends: 73 [2018-11-10 10:25:32,187 INFO L226 Difference]: Without dead ends: 69 [2018-11-10 10:25:32,188 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-11-10 10:25:32,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-10 10:25:32,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-10 10:25:32,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-10 10:25:32,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-10 10:25:32,191 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-11-10 10:25:32,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:25:32,191 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-10 10:25:32,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-10 10:25:32,191 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-10 10:25:32,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-10 10:25:32,192 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:25:32,192 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:25:32,192 INFO L424 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:25:32,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:25:32,192 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2018-11-10 10:25:32,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:25:32,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:32,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:25:32,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:32,193 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:25:32,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:32,376 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-10 10:25:32,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:32,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:25:32,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:25:32,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:25:32,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:32,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:25:32,382 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:25:32,382 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:25:32,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:25:32,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:25:32,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:25:32,420 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-10 10:25:32,420 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:25:45,213 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-11-10 10:25:45,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:25:45,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-11-10 10:25:45,229 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:25:45,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-10 10:25:45,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-10 10:25:45,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-11-10 10:25:45,230 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-11-10 10:25:45,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:25:45,436 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-11-10 10:25:45,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-10 10:25:45,436 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-11-10 10:25:45,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:25:45,437 INFO L225 Difference]: With dead ends: 76 [2018-11-10 10:25:45,437 INFO L226 Difference]: Without dead ends: 72 [2018-11-10 10:25:45,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-11-10 10:25:45,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-10 10:25:45,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-10 10:25:45,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-10 10:25:45,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-10 10:25:45,440 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-11-10 10:25:45,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:25:45,441 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-10 10:25:45,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-10 10:25:45,441 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-10 10:25:45,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-10 10:25:45,442 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:25:45,442 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:25:45,442 INFO L424 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:25:45,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:25:45,442 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2018-11-10 10:25:45,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:25:45,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:45,443 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:25:45,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:25:45,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:25:45,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:45,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-10 10:25:45,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:45,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:25:45,616 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:25:45,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:25:45,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:25:45,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:25:45,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:25:45,623 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:25:45,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:25:45,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:25:45,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-10 10:25:45,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:26:00,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-10 10:26:00,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:26:00,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2018-11-10 10:26:00,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:26:00,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-10 10:26:00,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-10 10:26:00,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2018-11-10 10:26:00,704 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-11-10 10:26:00,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:26:00,878 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-10 10:26:00,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-10 10:26:00,878 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-11-10 10:26:00,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:26:00,879 INFO L225 Difference]: With dead ends: 79 [2018-11-10 10:26:00,879 INFO L226 Difference]: Without dead ends: 75 [2018-11-10 10:26:00,880 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 40 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2018-11-10 10:26:00,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-10 10:26:00,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-11-10 10:26:00,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-10 10:26:00,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-10 10:26:00,882 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-11-10 10:26:00,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:26:00,883 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-10 10:26:00,883 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-10 10:26:00,883 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-10 10:26:00,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-10 10:26:00,883 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:26:00,883 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:26:00,883 INFO L424 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:26:00,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:26:00,884 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2018-11-10 10:26:00,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:26:00,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:00,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:26:00,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:00,884 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:26:00,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:26:01,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-10 10:26:01,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:01,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:26:01,075 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:26:01,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:26:01,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:01,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:26:01,080 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:26:01,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:26:01,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-10 10:26:01,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:26:01,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:26:01,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-10 10:26:01,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:26:18,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 1010 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-10 10:26:18,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:26:18,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 47 [2018-11-10 10:26:18,771 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:26:18,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-10 10:26:18,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-10 10:26:18,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=1608, Unknown=0, NotChecked=0, Total=2162 [2018-11-10 10:26:18,772 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-11-10 10:26:18,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:26:18,989 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-11-10 10:26:18,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-10 10:26:18,989 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-11-10 10:26:18,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:26:18,990 INFO L225 Difference]: With dead ends: 82 [2018-11-10 10:26:18,990 INFO L226 Difference]: Without dead ends: 78 [2018-11-10 10:26:18,990 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 223 SyntacticMatches, 42 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1499, Invalid=3057, Unknown=0, NotChecked=0, Total=4556 [2018-11-10 10:26:18,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-10 10:26:18,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-11-10 10:26:18,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-10 10:26:18,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-11-10 10:26:18,993 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-11-10 10:26:18,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:26:18,993 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-11-10 10:26:18,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-10 10:26:18,994 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-11-10 10:26:18,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-11-10 10:26:18,994 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:26:18,994 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:26:18,995 INFO L424 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:26:18,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:26:18,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1226192145, now seen corresponding path program 21 times [2018-11-10 10:26:18,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:26:18,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:18,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:26:18,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:18,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:26:19,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:26:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-10 10:26:19,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:19,208 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:26:19,208 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:26:19,208 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:26:19,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:19,208 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:26:19,214 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:26:19,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:26:19,239 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:26:19,239 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:26:19,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:26:19,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-10 10:26:19,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:26:39,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-10 10:26:39,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:26:39,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2018-11-10 10:26:39,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:26:39,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-10 10:26:39,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-10 10:26:39,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2018-11-10 10:26:39,621 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-11-10 10:26:39,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:26:39,862 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-11-10 10:26:39,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-10 10:26:39,864 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-11-10 10:26:39,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:26:39,865 INFO L225 Difference]: With dead ends: 85 [2018-11-10 10:26:39,865 INFO L226 Difference]: Without dead ends: 81 [2018-11-10 10:26:39,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 233 SyntacticMatches, 44 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2018-11-10 10:26:39,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-10 10:26:39,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-10 10:26:39,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-10 10:26:39,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-11-10 10:26:39,869 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-11-10 10:26:39,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:26:39,869 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-11-10 10:26:39,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-10 10:26:39,869 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-11-10 10:26:39,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-11-10 10:26:39,870 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:26:39,870 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:26:39,870 INFO L424 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:26:39,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:26:39,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1155535485, now seen corresponding path program 22 times [2018-11-10 10:26:39,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:26:39,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:39,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:26:39,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:26:39,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:26:39,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:26:40,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-10 10:26:40,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:40,158 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:26:40,158 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:26:40,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:26:40,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:26:40,158 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:26:40,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:26:40,164 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:26:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:26:40,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:26:40,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-10 10:26:40,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:27:03,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-11-10 10:27:03,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:27:03,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2018-11-10 10:27:03,858 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:27:03,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-10 10:27:03,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-10 10:27:03,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2018-11-10 10:27:03,859 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-11-10 10:27:04,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:27:04,127 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-11-10 10:27:04,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-10 10:27:04,127 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-11-10 10:27:04,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:27:04,128 INFO L225 Difference]: With dead ends: 88 [2018-11-10 10:27:04,128 INFO L226 Difference]: Without dead ends: 84 [2018-11-10 10:27:04,129 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 243 SyntacticMatches, 46 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2018-11-10 10:27:04,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-10 10:27:04,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-11-10 10:27:04,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-10 10:27:04,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-11-10 10:27:04,131 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-11-10 10:27:04,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:27:04,131 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-11-10 10:27:04,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-10 10:27:04,132 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-11-10 10:27:04,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-11-10 10:27:04,132 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:27:04,132 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:27:04,132 INFO L424 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:27:04,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:27:04,132 INFO L82 PathProgramCache]: Analyzing trace with hash 478692079, now seen corresponding path program 23 times [2018-11-10 10:27:04,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:27:04,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:27:04,133 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:27:04,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:27:04,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:27:04,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:27:04,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-10 10:27:04,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:27:04,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:27:04,373 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:27:04,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:27:04,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:27:04,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:27:04,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 10:27:04,381 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 10:27:04,428 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-10 10:27:04,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:27:04,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:27:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-10 10:27:04,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:27:31,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-10 10:27:31,507 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:27:31,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2018-11-10 10:27:31,507 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:27:31,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-10 10:27:31,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-10 10:27:31,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2018-11-10 10:27:31,508 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-11-10 10:27:31,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:27:31,770 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-11-10 10:27:31,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-10 10:27:31,770 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-11-10 10:27:31,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:27:31,770 INFO L225 Difference]: With dead ends: 91 [2018-11-10 10:27:31,770 INFO L226 Difference]: Without dead ends: 87 [2018-11-10 10:27:31,771 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 253 SyntacticMatches, 48 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2018-11-10 10:27:31,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-10 10:27:31,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-10 10:27:31,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-10 10:27:31,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-10 10:27:31,774 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-11-10 10:27:31,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:27:31,774 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-10 10:27:31,774 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-10 10:27:31,774 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-10 10:27:31,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-11-10 10:27:31,775 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:27:31,775 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:27:31,775 INFO L424 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:27:31,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:27:31,776 INFO L82 PathProgramCache]: Analyzing trace with hash -414572547, now seen corresponding path program 24 times [2018-11-10 10:27:31,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:27:31,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:27:31,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:27:31,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:27:31,776 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:27:31,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:27:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-10 10:27:32,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:27:32,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:27:32,034 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:27:32,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:27:32,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:27:32,034 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:27:32,039 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 10:27:32,039 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 10:27:32,070 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 10:27:32,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 10:27:32,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:27:32,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-10 10:27:32,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:28:03,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2018-11-10 10:28:03,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:28:03,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2018-11-10 10:28:03,099 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:28:03,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-10 10:28:03,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-10 10:28:03,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2018-11-10 10:28:03,099 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-11-10 10:28:03,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:28:03,374 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-11-10 10:28:03,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-10 10:28:03,374 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-11-10 10:28:03,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:28:03,375 INFO L225 Difference]: With dead ends: 94 [2018-11-10 10:28:03,375 INFO L226 Difference]: Without dead ends: 90 [2018-11-10 10:28:03,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 263 SyntacticMatches, 51 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2018-11-10 10:28:03,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-10 10:28:03,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-11-10 10:28:03,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-10 10:28:03,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-11-10 10:28:03,378 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-11-10 10:28:03,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:28:03,378 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-11-10 10:28:03,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-10 10:28:03,378 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-11-10 10:28:03,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-10 10:28:03,379 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 10:28:03,379 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 10:28:03,379 INFO L424 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 10:28:03,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 10:28:03,380 INFO L82 PathProgramCache]: Analyzing trace with hash -975000849, now seen corresponding path program 25 times [2018-11-10 10:28:03,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 10:28:03,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:28:03,380 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 10:28:03,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 10:28:03,380 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 10:28:03,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:28:04,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 999 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-11-10 10:28:04,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:28:04,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 10:28:04,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 10:28:04,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 10:28:04,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 10:28:04,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 10:28:04,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 10:28:04,690 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 10:28:04,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 10:28:04,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 10:28:07,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 949 proven. 50 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-11-10 10:28:07,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 10:28:11,423 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2018-11-10 10:28:11,620 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-11-10 10:28:11,921 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-11-10 10:28:12,037 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-11-10 10:28:12,240 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-10 10:28:12,346 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-10 10:28:12,462 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 141 [2018-11-10 10:28:12,674 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-11-10 10:28:12,784 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-11-10 10:28:16,265 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 126 [2018-11-10 10:28:16,457 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2018-11-10 10:28:16,652 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-11-10 10:28:16,857 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-11-10 10:28:17,065 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-11-10 10:28:17,265 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-10 10:28:17,370 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-10 10:28:55,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 900 proven. 675 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-10 10:28:55,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 10:28:55,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 83] total 193 [2018-11-10 10:28:55,094 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 10:28:55,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-11-10 10:28:55,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-11-10 10:28:55,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4821, Invalid=32235, Unknown=0, NotChecked=0, Total=37056 [2018-11-10 10:28:55,097 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 116 states. [2018-11-10 10:28:58,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 10:28:58,766 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-10 10:28:58,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-11-10 10:28:58,766 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 163 [2018-11-10 10:28:58,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 10:28:58,767 INFO L225 Difference]: With dead ends: 93 [2018-11-10 10:28:58,767 INFO L226 Difference]: Without dead ends: 0 [2018-11-10 10:28:58,769 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11061 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=8862, Invalid=51900, Unknown=0, NotChecked=0, Total=60762 [2018-11-10 10:28:58,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-10 10:28:58,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-10 10:28:58,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-10 10:28:58,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-10 10:28:58,770 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 163 [2018-11-10 10:28:58,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 10:28:58,770 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-10 10:28:58,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-11-10 10:28:58,770 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-10 10:28:58,770 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-10 10:28:58,774 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-10 10:28:58,799 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-10 10:28:58,799 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-10 10:28:58,799 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-10 10:28:58,799 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-10 10:28:58,799 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-10 10:28:58,799 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L16(line 16) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L15(lines 15 17) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L421 ceAbstractionStarter]: At program point L14(line 14) the Hoare annotation is: (and (<= main_~a~0 25) (<= 25 main_~a~0)) [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L14-1(line 14) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L421 ceAbstractionStarter]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (= sum_~n |sum_#in~n|) (< 0 sum_~n)) [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L7-1(line 7) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 8) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L425 ceAbstractionStarter]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2018-11-10 10:28:58,800 INFO L428 ceAbstractionStarter]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2018-11-10 10:28:58,802 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.11 10:28:58 BoogieIcfgContainer [2018-11-10 10:28:58,802 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-10 10:28:58,802 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-10 10:28:58,802 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-10 10:28:58,802 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-10 10:28:58,802 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 10:24:31" (3/4) ... [2018-11-10 10:28:58,805 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-10 10:28:58,808 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-10 10:28:58,809 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-10 10:28:58,809 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2018-11-10 10:28:58,811 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-10 10:28:58,811 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-11-10 10:28:58,811 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-10 10:28:58,833 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_61df3548-e941-4687-899b-2dcb951523cd/bin-2019/utaipan/witness.graphml [2018-11-10 10:28:58,833 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-10 10:28:58,833 INFO L168 Benchmark]: Toolchain (without parser) took 267468.50 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 195.6 MB). Free memory was 960.2 MB in the beginning and 744.1 MB in the end (delta: 216.1 MB). Peak memory consumption was 411.6 MB. Max. memory is 11.5 GB. [2018-11-10 10:28:58,834 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 10:28:58,834 INFO L168 Benchmark]: CACSL2BoogieTranslator took 122.16 ms. Allocated memory is still 1.0 GB. Free memory was 960.2 MB in the beginning and 949.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-10 10:28:58,834 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.05 ms. Allocated memory is still 1.0 GB. Free memory is still 949.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 10:28:58,835 INFO L168 Benchmark]: Boogie Preprocessor took 10.32 ms. Allocated memory is still 1.0 GB. Free memory is still 949.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 10:28:58,835 INFO L168 Benchmark]: RCFGBuilder took 146.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 145.8 MB). Free memory was 949.5 MB in the beginning and 1.1 GB in the end (delta: -186.0 MB). Peak memory consumption was 22.7 MB. Max. memory is 11.5 GB. [2018-11-10 10:28:58,835 INFO L168 Benchmark]: TraceAbstraction took 267144.22 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 49.8 MB). Free memory was 1.1 GB in the beginning and 751.9 MB in the end (delta: 380.2 MB). Peak memory consumption was 430.0 MB. Max. memory is 11.5 GB. [2018-11-10 10:28:58,836 INFO L168 Benchmark]: Witness Printer took 31.10 ms. Allocated memory is still 1.2 GB. Free memory was 751.9 MB in the beginning and 744.1 MB in the end (delta: 7.7 MB). Peak memory consumption was 7.7 MB. Max. memory is 11.5 GB. [2018-11-10 10:28:58,838 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 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 122.16 ms. Allocated memory is still 1.0 GB. Free memory was 960.2 MB in the beginning and 949.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.05 ms. Allocated memory is still 1.0 GB. Free memory is still 949.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.32 ms. Allocated memory is still 1.0 GB. Free memory is still 949.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 146.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 145.8 MB). Free memory was 949.5 MB in the beginning and 1.1 GB in the end (delta: -186.0 MB). Peak memory consumption was 22.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 267144.22 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 49.8 MB). Free memory was 1.1 GB in the beginning and 751.9 MB in the end (delta: 380.2 MB). Peak memory consumption was 430.0 MB. Max. memory is 11.5 GB. * Witness Printer took 31.10 ms. Allocated memory is still 1.2 GB. Free memory was 751.9 MB in the beginning and 744.1 MB in the end (delta: 7.7 MB). Peak memory consumption was 7.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 267.1s OverallTime, 26 OverallIterations, 26 TraceHistogramMax, 7.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 337 SDtfs, 916 SDslu, 4588 SDs, 0 SdLazy, 5579 SolverSat, 326 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5712 GetRequests, 3767 SyntacticMatches, 653 SemanticMatches, 1292 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27235 ImplicationChecksByTransitivity, 24.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 22 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 257.9s InterpolantComputationTime, 4563 NumberOfCodeBlocks, 4563 NumberOfCodeBlocksAsserted, 159 NumberOfCheckSat, 6762 ConstructedInterpolants, 0 QuantifiedInterpolants, 2869632 SizeOfPredicates, 404 NumberOfNonLiveVariables, 6750 ConjunctsInSsa, 963 ConjunctsInUnsatCore, 76 InterpolantComputations, 1 PerfectInterpolantSequences, 21576/50700 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...