./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/sum04_true-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loops/sum04_true-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UTaipan-linux --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 1dbb3ffac91b20f4dd3e7b4eb671e84b2870fc33 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-21 12:29:07,586 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:29:07,588 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:29:07,599 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:29:07,600 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:29:07,601 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:29:07,602 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:29:07,604 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:29:07,606 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:29:07,609 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:29:07,611 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:29:07,612 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:29:07,613 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:29:07,614 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:29:07,617 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:29:07,618 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:29:07,619 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:29:07,628 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:29:07,630 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:29:07,634 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:29:07,638 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:29:07,639 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:29:07,643 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:29:07,643 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:29:07,643 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:29:07,647 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:29:07,648 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:29:07,648 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:29:07,649 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:29:07,652 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:29:07,653 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:29:07,654 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:29:07,654 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:29:07,654 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:29:07,656 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:29:07,658 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:29:07,660 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:29:07,688 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:29:07,688 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:29:07,689 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:29:07,689 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:29:07,689 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:29:07,689 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:29:07,689 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:29:07,693 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:29:07,694 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:29:07,694 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:29:07,694 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:29:07,695 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:29:07,696 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:29:07,696 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:29:07,697 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:29:07,700 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:29:07,700 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:29:07,700 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:29:07,700 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:29:07,701 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:29:07,701 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:29:07,701 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:29:07,701 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:29:07,701 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:29:07,701 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:29:07,702 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:29:07,702 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:29:07,702 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:29:07,702 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:29:07,702 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 -> /storage/repos/ultimate/releaseScripts/default/UTaipan-linux 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 -> 1dbb3ffac91b20f4dd3e7b4eb671e84b2870fc33 [2018-10-21 12:29:07,777 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:29:07,791 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:29:07,797 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:29:07,798 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:29:07,799 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:29:07,800 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum04_true-unreach-call_true-termination.i [2018-10-21 12:29:07,853 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/92116426e/e5462e4dfb0248daad990a93a00fe3e2/FLAG03dd946f8 [2018-10-21 12:29:08,325 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:29:08,329 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04_true-unreach-call_true-termination.i [2018-10-21 12:29:08,336 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/92116426e/e5462e4dfb0248daad990a93a00fe3e2/FLAG03dd946f8 [2018-10-21 12:29:08,357 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/92116426e/e5462e4dfb0248daad990a93a00fe3e2 [2018-10-21 12:29:08,362 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:29:08,365 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:29:08,366 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:29:08,367 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:29:08,371 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:29:08,372 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,376 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c1de0e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08, skipping insertion in model container [2018-10-21 12:29:08,378 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,390 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:29:08,420 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:29:08,627 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:29:08,631 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:29:08,652 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:29:08,669 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:29:08,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08 WrapperNode [2018-10-21 12:29:08,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:29:08,670 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:29:08,671 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:29:08,671 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:29:08,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,691 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,697 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:29:08,698 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:29:08,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:29:08,698 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:29:08,709 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,710 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,710 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,711 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,714 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,721 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... [2018-10-21 12:29:08,722 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:29:08,723 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:29:08,723 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:29:08,723 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:29:08,724 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:29:08,874 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:29:08,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:29:08,874 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:29:08,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:29:08,875 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:29:08,875 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:29:08,875 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:29:08,876 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:29:09,290 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:29:09,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:29:09 BoogieIcfgContainer [2018-10-21 12:29:09,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:29:09,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:29:09,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:29:09,301 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:29:09,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:29:08" (1/3) ... [2018-10-21 12:29:09,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d96734 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:29:09, skipping insertion in model container [2018-10-21 12:29:09,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:29:08" (2/3) ... [2018-10-21 12:29:09,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d96734 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:29:09, skipping insertion in model container [2018-10-21 12:29:09,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:29:09" (3/3) ... [2018-10-21 12:29:09,308 INFO L112 eAbstractionObserver]: Analyzing ICFG sum04_true-unreach-call_true-termination.i [2018-10-21 12:29:09,318 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:29:09,331 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:29:09,349 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:29:09,386 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:29:09,387 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:29:09,387 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:29:09,387 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:29:09,387 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:29:09,388 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:29:09,388 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:29:09,388 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:29:09,388 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:29:09,406 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-21 12:29:09,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-21 12:29:09,413 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:09,414 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:09,416 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:09,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:09,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1870586046, now seen corresponding path program 1 times [2018-10-21 12:29:09,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:09,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:09,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,478 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:09,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:09,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:09,535 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:29:09,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:29:09,535 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:29:09,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:29:09,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:29:09,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:29:09,557 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-21 12:29:09,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:09,577 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-10-21 12:29:09,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:29:09,579 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-21 12:29:09,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:09,588 INFO L225 Difference]: With dead ends: 30 [2018-10-21 12:29:09,588 INFO L226 Difference]: Without dead ends: 13 [2018-10-21 12:29:09,592 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:29:09,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-21 12:29:09,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-21 12:29:09,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-21 12:29:09,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-21 12:29:09,630 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-21 12:29:09,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:09,630 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-21 12:29:09,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:29:09,631 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-21 12:29:09,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:29:09,632 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:09,632 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:09,633 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:09,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:09,633 INFO L82 PathProgramCache]: Analyzing trace with hash 1861068280, now seen corresponding path program 1 times [2018-10-21 12:29:09,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:09,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:09,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,635 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:09,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:09,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:09,741 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:29:09,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-21 12:29:09,743 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:29:09,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-21 12:29:09,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-21 12:29:09,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:29:09,746 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-21 12:29:09,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:09,828 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-21 12:29:09,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-21 12:29:09,829 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-21 12:29:09,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:09,830 INFO L225 Difference]: With dead ends: 21 [2018-10-21 12:29:09,830 INFO L226 Difference]: Without dead ends: 16 [2018-10-21 12:29:09,832 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:29:09,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-21 12:29:09,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-21 12:29:09,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-21 12:29:09,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-21 12:29:09,837 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-21 12:29:09,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:09,837 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-21 12:29:09,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-21 12:29:09,838 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-21 12:29:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-21 12:29:09,838 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:09,839 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:09,839 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:09,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:09,839 INFO L82 PathProgramCache]: Analyzing trace with hash 996352094, now seen corresponding path program 1 times [2018-10-21 12:29:09,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:09,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:09,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:09,841 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:09,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:09,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:09,933 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:09,934 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-21 12:29:09,936 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [21], [24], [26], [32], [33], [34], [36] [2018-10-21 12:29:09,993 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:29:09,993 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:29:10,259 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:29:10,260 INFO L272 AbstractInterpreter]: Visited 13 different actions 61 times. Merged at 4 different actions 30 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-21 12:29:10,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:10,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:29:10,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:10,289 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:10,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:10,304 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:29:10,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:10,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:10,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:10,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:10,456 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:10,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:10,474 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:29:10,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:10,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:10,499 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:10,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:10,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-21 12:29:10,528 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:10,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:29:10,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:29:10,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:29:10,530 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-21 12:29:10,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:10,587 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-21 12:29:10,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:29:10,588 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-21 12:29:10,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:10,589 INFO L225 Difference]: With dead ends: 24 [2018-10-21 12:29:10,589 INFO L226 Difference]: Without dead ends: 19 [2018-10-21 12:29:10,590 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:29:10,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-21 12:29:10,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-21 12:29:10,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-21 12:29:10,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-21 12:29:10,595 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-21 12:29:10,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:10,595 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-21 12:29:10,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:29:10,595 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-21 12:29:10,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-21 12:29:10,596 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:10,596 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:10,597 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:10,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:10,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1450296376, now seen corresponding path program 2 times [2018-10-21 12:29:10,597 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:10,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:10,598 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:10,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:10,599 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:10,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:10,721 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:10,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:10,722 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:10,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:10,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:10,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:10,731 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:29:10,731 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:10,747 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:29:10,747 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:10,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:10,756 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:10,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:11,049 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,085 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:11,111 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:29:11,111 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:11,138 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:29:11,138 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:11,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:11,147 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:11,182 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:11,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-21 12:29:11,185 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:11,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-21 12:29:11,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-21 12:29:11,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:29:11,186 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-10-21 12:29:11,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:11,241 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-21 12:29:11,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-21 12:29:11,242 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-21 12:29:11,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:11,243 INFO L225 Difference]: With dead ends: 27 [2018-10-21 12:29:11,243 INFO L226 Difference]: Without dead ends: 22 [2018-10-21 12:29:11,244 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:29:11,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-21 12:29:11,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-21 12:29:11,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-21 12:29:11,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-21 12:29:11,250 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-21 12:29:11,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:11,250 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-21 12:29:11,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-21 12:29:11,250 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-21 12:29:11,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-21 12:29:11,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:11,251 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:11,252 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:11,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:11,252 INFO L82 PathProgramCache]: Analyzing trace with hash 52386334, now seen corresponding path program 3 times [2018-10-21 12:29:11,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:11,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:11,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:11,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:11,254 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:11,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:11,385 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,386 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:11,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:11,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:11,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,387 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:11,396 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:29:11,396 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:29:11,415 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:29:11,415 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:11,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:11,643 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,664 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:11,681 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:29:11,681 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:29:11,706 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:29:11,706 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:11,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:11,717 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:11,731 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:11,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-21 12:29:11,736 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:11,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-21 12:29:11,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-21 12:29:11,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:11,737 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-10-21 12:29:11,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:11,784 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-21 12:29:11,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-21 12:29:11,787 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-21 12:29:11,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:11,788 INFO L225 Difference]: With dead ends: 30 [2018-10-21 12:29:11,788 INFO L226 Difference]: Without dead ends: 25 [2018-10-21 12:29:11,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:11,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-21 12:29:11,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-21 12:29:11,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-21 12:29:11,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-21 12:29:11,793 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-21 12:29:11,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:11,794 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-21 12:29:11,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-21 12:29:11,794 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-21 12:29:11,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-21 12:29:11,795 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:11,795 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:11,795 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:11,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:11,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1082772872, now seen corresponding path program 4 times [2018-10-21 12:29:11,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:11,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:11,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:11,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:11,797 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:11,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:11,882 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,883 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:11,884 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:11,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:11,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:11,884 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:11,893 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:29:11,893 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:29:11,902 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:29:11,903 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:11,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:11,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:12,223 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:12,261 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:12,288 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:29:12,288 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:29:12,305 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:29:12,306 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:12,311 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:12,324 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:12,373 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:12,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 10 [2018-10-21 12:29:12,375 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:12,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-21 12:29:12,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-21 12:29:12,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:12,377 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-21 12:29:12,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:12,422 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-21 12:29:12,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:29:12,425 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-21 12:29:12,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:12,426 INFO L225 Difference]: With dead ends: 33 [2018-10-21 12:29:12,426 INFO L226 Difference]: Without dead ends: 28 [2018-10-21 12:29:12,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 85 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:12,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-21 12:29:12,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-21 12:29:12,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-21 12:29:12,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-21 12:29:12,431 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-21 12:29:12,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:12,432 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-21 12:29:12,432 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-21 12:29:12,432 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-21 12:29:12,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-21 12:29:12,433 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:12,433 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:12,433 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:12,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:12,434 INFO L82 PathProgramCache]: Analyzing trace with hash -38190114, now seen corresponding path program 5 times [2018-10-21 12:29:12,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:12,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:12,435 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:12,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:12,435 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:12,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:12,552 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:12,552 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:12,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:12,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:12,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:12,553 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:12,566 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:29:12,567 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:12,604 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-21 12:29:12,604 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:12,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:12,614 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:12,745 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:12,767 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:12,784 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:29:12,784 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:12,820 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-21 12:29:12,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:12,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:12,831 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:12,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:12,895 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (11)] Exception during sending of exit command (exit): Broken pipe [2018-10-21 12:29:12,898 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:12,898 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 10 [2018-10-21 12:29:12,898 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:12,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:29:12,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:29:12,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:12,900 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-21 12:29:12,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:12,956 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-21 12:29:12,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:29:12,957 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-21 12:29:12,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:12,958 INFO L225 Difference]: With dead ends: 36 [2018-10-21 12:29:12,958 INFO L226 Difference]: Without dead ends: 31 [2018-10-21 12:29:12,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 94 SyntacticMatches, 8 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:12,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-21 12:29:12,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-21 12:29:12,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-21 12:29:12,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-21 12:29:12,964 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-21 12:29:12,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:12,964 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-21 12:29:12,964 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:29:12,964 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-21 12:29:12,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-21 12:29:12,965 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:12,965 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:12,966 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:12,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:12,966 INFO L82 PathProgramCache]: Analyzing trace with hash 2088693944, now seen corresponding path program 6 times [2018-10-21 12:29:12,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:12,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:12,967 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:12,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:12,967 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:12,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:13,083 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:13,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:13,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:13,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:13,095 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:29:13,096 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:29:13,122 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-21 12:29:13,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:13,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:13,133 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:13,268 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,289 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:13,305 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-21 12:29:13,305 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-21 12:29:13,348 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-21 12:29:13,348 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:13,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:13,357 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:13,499 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:13,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 10 [2018-10-21 12:29:13,502 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:13,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-21 12:29:13,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-21 12:29:13,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:13,503 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-21 12:29:13,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:13,569 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-21 12:29:13,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-21 12:29:13,571 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-21 12:29:13,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:13,573 INFO L225 Difference]: With dead ends: 39 [2018-10-21 12:29:13,573 INFO L226 Difference]: Without dead ends: 34 [2018-10-21 12:29:13,573 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 103 SyntacticMatches, 12 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:13,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-21 12:29:13,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-21 12:29:13,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-21 12:29:13,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-21 12:29:13,579 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-21 12:29:13,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:13,580 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-21 12:29:13,580 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-21 12:29:13,580 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-21 12:29:13,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-21 12:29:13,581 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:13,581 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:13,581 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:13,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:13,582 INFO L82 PathProgramCache]: Analyzing trace with hash 439147934, now seen corresponding path program 7 times [2018-10-21 12:29:13,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:13,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:13,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:13,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:13,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:13,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:13,829 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,830 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:13,830 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:13,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:13,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,831 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:13,839 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:13,839 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:29:13,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:13,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:13,864 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:13,966 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:13,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:13,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:14,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:14,003 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:29:14,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:14,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:14,033 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:14,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:14,104 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:14,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:14,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 10 [2018-10-21 12:29:14,112 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:14,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-21 12:29:14,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-21 12:29:14,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:14,115 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-21 12:29:14,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:14,175 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-21 12:29:14,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-21 12:29:14,179 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-21 12:29:14,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:14,180 INFO L225 Difference]: With dead ends: 41 [2018-10-21 12:29:14,180 INFO L226 Difference]: Without dead ends: 36 [2018-10-21 12:29:14,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 114 SyntacticMatches, 14 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:29:14,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-21 12:29:14,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-21 12:29:14,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-21 12:29:14,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-21 12:29:14,185 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-21 12:29:14,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:14,186 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-21 12:29:14,186 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-21 12:29:14,186 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-21 12:29:14,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-21 12:29:14,187 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:14,187 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:14,187 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:14,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:14,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1829764856, now seen corresponding path program 8 times [2018-10-21 12:29:14,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:14,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:14,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:29:14,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:14,189 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:14,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:14,466 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:14,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:14,466 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:29:14,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:29:14,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:29:14,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:14,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:29:14,484 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:29:14,484 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:14,498 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:29:14,498 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:14,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:14,559 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:14,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:15,032 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:15,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:29:15,053 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:29:15,069 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:29:15,069 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:29:15,097 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:29:15,098 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:29:15,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:29:15,342 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:15,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:29:15,365 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:15,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:29:15,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-21 12:29:15,367 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:29:15,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-21 12:29:15,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-21 12:29:15,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=495, Unknown=0, NotChecked=0, Total=552 [2018-10-21 12:29:15,368 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-21 12:29:15,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:15,715 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-21 12:29:15,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-21 12:29:15,716 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-21 12:29:15,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:15,718 INFO L225 Difference]: With dead ends: 44 [2018-10-21 12:29:15,718 INFO L226 Difference]: Without dead ends: 39 [2018-10-21 12:29:15,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 123 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=63, Invalid=537, Unknown=0, NotChecked=0, Total=600 [2018-10-21 12:29:15,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-21 12:29:15,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-21 12:29:15,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-21 12:29:15,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-21 12:29:15,726 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-21 12:29:15,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:15,726 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-21 12:29:15,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-21 12:29:15,726 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-21 12:29:15,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-21 12:29:15,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:29:15,727 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:29:15,728 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:29:15,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:29:15,728 INFO L82 PathProgramCache]: Analyzing trace with hash 443950942, now seen corresponding path program 9 times [2018-10-21 12:29:15,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:29:15,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:15,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:29:15,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:29:15,729 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:29:15,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:29:15,942 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 126 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:29:15,942 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:29:15,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2018-10-21 12:29:15,942 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:29:15,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-21 12:29:15,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-21 12:29:15,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-21 12:29:15,943 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 11 states. [2018-10-21 12:29:16,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:29:16,028 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-21 12:29:16,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-21 12:29:16,029 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2018-10-21 12:29:16,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:29:16,029 INFO L225 Difference]: With dead ends: 39 [2018-10-21 12:29:16,029 INFO L226 Difference]: Without dead ends: 0 [2018-10-21 12:29:16,030 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-21 12:29:16,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-21 12:29:16,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-21 12:29:16,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-21 12:29:16,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-21 12:29:16,031 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 38 [2018-10-21 12:29:16,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:29:16,031 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-21 12:29:16,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-21 12:29:16,031 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-21 12:29:16,031 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-21 12:29:16,037 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-21 12:29:16,172 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-21 12:29:16,172 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:29:16,172 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:29:16,172 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-21 12:29:16,172 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-21 12:29:16,173 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-21 12:29:16,173 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2018-10-21 12:29:16,173 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2018-10-21 12:29:16,173 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2018-10-21 12:29:16,173 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 15) no Hoare annotation was computed. [2018-10-21 12:29:16,173 INFO L425 ceAbstractionStarter]: For program point L13-3(lines 13 15) no Hoare annotation was computed. [2018-10-21 12:29:16,176 INFO L421 ceAbstractionStarter]: At program point L13-4(lines 13 15) the Hoare annotation is: (or (and (<= 10 main_~sn~0) (<= 6 main_~i~0) (<= main_~i~0 6) (<= main_~sn~0 10)) (and (<= 1 main_~i~0) (<= main_~i~0 1) (<= main_~sn~0 0) (<= 0 main_~sn~0)) (and (<= 2 main_~i~0) (<= main_~i~0 2) (<= main_~sn~0 2) (<= 2 main_~sn~0)) (and (<= 7 main_~i~0) (<= 12 main_~sn~0) (<= main_~sn~0 12) (<= main_~i~0 7)) (and (<= 6 main_~sn~0) (<= main_~sn~0 6) (<= 4 main_~i~0) (<= main_~i~0 4)) (and (<= 9 main_~i~0) (<= main_~sn~0 16) (< 15 main_~sn~0)) (and (<= main_~i~0 3) (<= main_~sn~0 4) (<= 3 main_~i~0) (<= 4 main_~sn~0)) (and (<= 14 main_~sn~0) (<= 8 main_~i~0) (<= main_~i~0 8) (<= main_~sn~0 14)) (and (<= main_~sn~0 8) (<= 5 main_~i~0) (<= main_~i~0 5) (<= 8 main_~sn~0))) [2018-10-21 12:29:16,176 INFO L421 ceAbstractionStarter]: At program point L13-5(lines 13 15) the Hoare annotation is: (and (<= main_~sn~0 16) (< 15 main_~sn~0)) [2018-10-21 12:29:16,176 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-21 12:29:16,176 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:29:16,177 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-21 12:29:16,177 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-21 12:29:16,177 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-21 12:29:16,177 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:29:16,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:29:16 BoogieIcfgContainer [2018-10-21 12:29:16,193 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:29:16,194 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:29:16,194 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:29:16,194 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:29:16,195 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:29:09" (3/4) ... [2018-10-21 12:29:16,199 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-21 12:29:16,205 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-21 12:29:16,206 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-21 12:29:16,206 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-21 12:29:16,210 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2018-10-21 12:29:16,211 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2018-10-21 12:29:16,211 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-21 12:29:16,265 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:29:16,265 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:29:16,266 INFO L168 Benchmark]: Toolchain (without parser) took 7902.78 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 183.5 MB). Free memory was 949.2 MB in the beginning and 1.0 GB in the end (delta: -74.4 MB). Peak memory consumption was 109.1 MB. Max. memory is 11.5 GB. [2018-10-21 12:29:16,268 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:29:16,268 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.01 ms. Allocated memory is still 1.0 GB. Free memory was 949.2 MB in the beginning and 938.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:29:16,269 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.90 ms. Allocated memory is still 1.0 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:29:16,269 INFO L168 Benchmark]: Boogie Preprocessor took 24.54 ms. Allocated memory is still 1.0 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:29:16,270 INFO L168 Benchmark]: RCFGBuilder took 573.03 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 938.4 MB in the beginning and 1.1 GB in the end (delta: -136.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. [2018-10-21 12:29:16,270 INFO L168 Benchmark]: TraceAbstraction took 6896.07 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 83.9 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 43.9 MB). Peak memory consumption was 127.8 MB. Max. memory is 11.5 GB. [2018-10-21 12:29:16,271 INFO L168 Benchmark]: Witness Printer took 71.71 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 7.8 MB). Peak memory consumption was 7.8 MB. Max. memory is 11.5 GB. [2018-10-21 12:29:16,276 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 304.01 ms. Allocated memory is still 1.0 GB. Free memory was 949.2 MB in the beginning and 938.4 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 26.90 ms. Allocated memory is still 1.0 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 24.54 ms. Allocated memory is still 1.0 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 573.03 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 938.4 MB in the beginning and 1.1 GB in the end (delta: -136.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6896.07 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 83.9 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 43.9 MB). Peak memory consumption was 127.8 MB. Max. memory is 11.5 GB. * Witness Printer took 71.71 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 7.8 MB). Peak memory consumption was 7.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((((((((10 <= sn && 6 <= i) && i <= 6) && sn <= 10) || (((1 <= i && i <= 1) && sn <= 0) && 0 <= sn)) || (((2 <= i && i <= 2) && sn <= 2) && 2 <= sn)) || (((7 <= i && 12 <= sn) && sn <= 12) && i <= 7)) || (((6 <= sn && sn <= 6) && 4 <= i) && i <= 4)) || ((9 <= i && sn <= 16) && 15 < sn)) || (((i <= 3 && sn <= 4) && 3 <= i) && 4 <= sn)) || (((14 <= sn && 8 <= i) && i <= 8) && sn <= 14)) || (((sn <= 8 && 5 <= i) && i <= 5) && 8 <= sn) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. SAFE Result, 6.8s OverallTime, 11 OverallIterations, 10 TraceHistogramMax, 0.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 147 SDtfs, 37 SDslu, 594 SDs, 0 SdLazy, 277 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 847 GetRequests, 720 SyntacticMatches, 44 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 3.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 7 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 127 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 647 NumberOfCodeBlocks, 645 NumberOfCodeBlocksAsserted, 59 NumberOfCheckSat, 996 ConstructedInterpolants, 0 QuantifiedInterpolants, 83058 SizeOfPredicates, 16 NumberOfNonLiveVariables, 824 ConjunctsInSsa, 132 ConjunctsInUnsatCore, 43 InterpolantComputations, 3 PerfectInterpolantSequences, 126/1746 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...