./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_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/loop-acceleration/underapprox_false-unreach-call2_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 c0ad4658b31654787cb281a441e891421d607e94 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-21 12:33:11,672 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:33:11,674 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:33:11,691 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:33:11,692 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:33:11,693 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:33:11,694 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:33:11,697 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:33:11,698 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:33:11,699 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:33:11,700 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:33:11,700 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:33:11,701 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:33:11,703 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:33:11,704 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:33:11,705 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:33:11,706 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:33:11,708 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:33:11,710 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:33:11,712 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:33:11,713 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:33:11,715 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:33:11,717 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:33:11,718 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:33:11,718 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:33:11,719 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:33:11,720 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:33:11,721 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:33:11,722 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:33:11,723 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:33:11,723 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:33:11,725 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:33:11,725 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:33:11,725 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:33:11,726 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:33:11,728 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:33:11,728 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:33:11,744 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:33:11,745 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:33:11,746 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:33:11,746 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:33:11,746 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:33:11,746 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:33:11,746 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:33:11,747 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:33:11,747 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:33:11,748 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:33:11,748 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:33:11,749 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:33:11,749 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:33:11,750 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:33:11,750 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:33:11,750 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:33:11,750 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:33:11,750 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:33:11,751 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:33:11,752 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:33:11,752 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:33:11,752 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:33:11,752 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:33:11,752 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:33:11,753 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:33:11,753 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:33:11,753 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:33:11,753 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:33:11,753 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:33:11,754 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:33:11,755 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:33:11,755 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:33:11,755 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:33:11,756 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:33:11,756 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 -> c0ad4658b31654787cb281a441e891421d607e94 [2018-10-21 12:33:11,823 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:33:11,840 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:33:11,844 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:33:11,846 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:33:11,847 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:33:11,847 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-21 12:33:11,906 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2b2bc6148/d3fc2246a54148469ce89206e2e308de/FLAGe834f993f [2018-10-21 12:33:12,304 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:33:12,305 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-21 12:33:12,312 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2b2bc6148/d3fc2246a54148469ce89206e2e308de/FLAGe834f993f [2018-10-21 12:33:12,327 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2b2bc6148/d3fc2246a54148469ce89206e2e308de [2018-10-21 12:33:12,332 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:33:12,334 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:33:12,335 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:33:12,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:33:12,340 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:33:12,341 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,345 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@241d7add and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12, skipping insertion in model container [2018-10-21 12:33:12,345 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,356 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:33:12,377 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:33:12,601 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:33:12,606 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:33:12,627 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:33:12,645 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:33:12,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12 WrapperNode [2018-10-21 12:33:12,646 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:33:12,647 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:33:12,647 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:33:12,647 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:33:12,658 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,664 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,670 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:33:12,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:33:12,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:33:12,671 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:33:12,679 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,680 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,680 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,689 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,690 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (1/1) ... [2018-10-21 12:33:12,691 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:33:12,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:33:12,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:33:12,692 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:33:12,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (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 12:33:12,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:33:12,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:33:12,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:33:12,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:33:12,811 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:33:12,811 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:33:12,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:33:12,812 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:33:13,022 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:33:13,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:33:13 BoogieIcfgContainer [2018-10-21 12:33:13,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:33:13,025 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:33:13,025 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:33:13,028 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:33:13,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:33:12" (1/3) ... [2018-10-21 12:33:13,030 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f2451b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:33:13, skipping insertion in model container [2018-10-21 12:33:13,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:33:12" (2/3) ... [2018-10-21 12:33:13,030 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f2451b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:33:13, skipping insertion in model container [2018-10-21 12:33:13,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:33:13" (3/3) ... [2018-10-21 12:33:13,033 INFO L112 eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call2_true-termination.i [2018-10-21 12:33:13,044 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:33:13,052 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:33:13,070 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:33:13,103 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:33:13,104 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:33:13,104 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:33:13,104 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:33:13,104 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:33:13,104 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:33:13,104 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:33:13,104 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:33:13,105 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:33:13,124 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-21 12:33:13,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-21 12:33:13,136 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:13,137 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:13,140 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:13,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:13,147 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-21 12:33:13,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:13,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:13,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,205 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:13,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:13,259 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 12:33:13,261 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:33:13,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:33:13,262 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:33:13,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:33:13,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:33:13,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:33:13,287 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-21 12:33:13,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:13,314 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-21 12:33:13,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:33:13,316 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-21 12:33:13,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:13,324 INFO L225 Difference]: With dead ends: 29 [2018-10-21 12:33:13,324 INFO L226 Difference]: Without dead ends: 12 [2018-10-21 12:33:13,328 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 12:33:13,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-21 12:33:13,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-21 12:33:13,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-21 12:33:13,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-21 12:33:13,362 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-21 12:33:13,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:13,363 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-21 12:33:13,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:33:13,363 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-21 12:33:13,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:33:13,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:13,365 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:13,365 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:13,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:13,366 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-21 12:33:13,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:13,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:13,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,368 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:13,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:13,543 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-21 12:33:13,569 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 12:33:13,569 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:33:13,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-21 12:33:13,569 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:33:13,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-21 12:33:13,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-21 12:33:13,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:33:13,574 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-21 12:33:13,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:13,624 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-21 12:33:13,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-21 12:33:13,625 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-21 12:33:13,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:13,626 INFO L225 Difference]: With dead ends: 19 [2018-10-21 12:33:13,626 INFO L226 Difference]: Without dead ends: 14 [2018-10-21 12:33:13,628 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:33:13,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-21 12:33:13,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-21 12:33:13,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-21 12:33:13,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-21 12:33:13,635 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-21 12:33:13,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:13,635 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-21 12:33:13,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-21 12:33:13,636 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-21 12:33:13,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-21 12:33:13,637 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:13,638 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:13,638 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:13,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:13,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-21 12:33:13,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:13,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,642 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:13,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:13,642 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:13,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:13,926 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 12:33:13,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:13,927 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:33:13,928 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-21 12:33:13,931 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-21 12:33:14,007 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:33:14,007 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:33:14,141 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-21 12:33:14,370 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:33:14,372 INFO L272 AbstractInterpreter]: Visited 12 different actions 64 times. Merged at 3 different actions 25 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-21 12:33:14,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:14,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:33:14,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:14,408 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 12:33:14,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:14,420 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:33:14,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:14,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:14,513 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 12:33:14,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:14,768 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 12:33:14,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:14,806 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 12:33:14,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:14,825 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:33:14,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:14,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:15,156 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 12:33:15,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:15,166 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 12:33:15,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:33:15,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 6, 6, 6] total 10 [2018-10-21 12:33:15,169 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:33:15,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:33:15,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:33:15,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:33:15,170 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-21 12:33:15,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:15,195 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-21 12:33:15,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:33:15,196 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-21 12:33:15,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:15,197 INFO L225 Difference]: With dead ends: 21 [2018-10-21 12:33:15,197 INFO L226 Difference]: Without dead ends: 16 [2018-10-21 12:33:15,198 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:33:15,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-21 12:33:15,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-21 12:33:15,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-21 12:33:15,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-21 12:33:15,203 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-21 12:33:15,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:15,204 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-21 12:33:15,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:33:15,204 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-21 12:33:15,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-21 12:33:15,205 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:15,205 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:15,205 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:15,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:15,206 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-21 12:33:15,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:15,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:15,207 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:33:15,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:15,207 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:15,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:15,329 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:15,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:15,329 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:33:15,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:33:15,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:33:15,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:15,330 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 12:33:15,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:33:15,341 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:33:15,364 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:33:15,364 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:15,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:15,409 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:15,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:15,650 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:15,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:15,681 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 12:33:15,701 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:33:15,701 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:33:15,718 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:33:15,719 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:15,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:15,805 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:15,805 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:15,850 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:15,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:33:15,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 7, 7, 7] total 12 [2018-10-21 12:33:15,855 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:33:15,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-21 12:33:15,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-21 12:33:15,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-10-21 12:33:15,856 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-21 12:33:15,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:15,899 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-21 12:33:15,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-21 12:33:15,901 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-21 12:33:15,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:15,902 INFO L225 Difference]: With dead ends: 23 [2018-10-21 12:33:15,902 INFO L226 Difference]: Without dead ends: 18 [2018-10-21 12:33:15,903 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-10-21 12:33:15,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-21 12:33:15,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-21 12:33:15,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-21 12:33:15,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-21 12:33:15,908 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-21 12:33:15,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:15,908 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-21 12:33:15,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-21 12:33:15,908 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-21 12:33:15,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-21 12:33:15,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:15,909 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:15,910 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:15,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:15,910 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-21 12:33:15,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:15,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:15,911 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:33:15,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:15,912 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:15,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:16,119 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:16,119 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:33:16,119 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:33:16,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:33:16,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:16,120 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 12:33:16,129 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:33:16,129 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:33:16,147 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:33:16,147 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:16,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:16,594 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:16,615 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 12:33:16,631 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:33:16,632 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:33:16,663 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:33:16,663 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:16,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:16,770 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:16,786 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:33:16,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 8] total 14 [2018-10-21 12:33:16,788 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:33:16,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-21 12:33:16,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-21 12:33:16,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-21 12:33:16,790 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-21 12:33:16,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:16,839 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-21 12:33:16,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-21 12:33:16,840 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-21 12:33:16,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:16,841 INFO L225 Difference]: With dead ends: 25 [2018-10-21 12:33:16,841 INFO L226 Difference]: Without dead ends: 20 [2018-10-21 12:33:16,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-21 12:33:16,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-21 12:33:16,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-21 12:33:16,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-21 12:33:16,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-21 12:33:16,846 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-21 12:33:16,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:16,847 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-21 12:33:16,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-21 12:33:16,847 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-21 12:33:16,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-21 12:33:16,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:16,848 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:16,848 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:16,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:16,848 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-21 12:33:16,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:16,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:16,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:33:16,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:16,850 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:16,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:16,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:16,955 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:33:16,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:33:16,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:33:16,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:16,955 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 12:33:16,966 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:33:16,966 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:33:16,983 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:33:16,983 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:16,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:17,000 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:17,192 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:17,214 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 12:33:17,236 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:33:17,236 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:33:17,255 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:33:17,255 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:17,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:17,340 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:17,350 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:33:17,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 9, 9] total 16 [2018-10-21 12:33:17,352 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:33:17,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-21 12:33:17,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-21 12:33:17,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2018-10-21 12:33:17,354 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-21 12:33:17,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:17,415 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-21 12:33:17,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:33:17,417 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-21 12:33:17,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:17,418 INFO L225 Difference]: With dead ends: 27 [2018-10-21 12:33:17,418 INFO L226 Difference]: Without dead ends: 22 [2018-10-21 12:33:17,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2018-10-21 12:33:17,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-21 12:33:17,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-21 12:33:17,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-21 12:33:17,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-21 12:33:17,423 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-21 12:33:17,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:17,424 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-21 12:33:17,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-21 12:33:17,424 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-21 12:33:17,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-21 12:33:17,425 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:17,425 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:17,425 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:17,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:17,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-21 12:33:17,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:17,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:17,427 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:33:17,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:17,427 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:17,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:33:17,686 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:17,687 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:33:17,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:33:17,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:33:17,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:17,688 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 12:33:17,696 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:33:17,697 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:33:17,731 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-21 12:33:17,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:17,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:17,763 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:17,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:18,065 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:18,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:33:18,096 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 12:33:18,112 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-21 12:33:18,112 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:33:18,155 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-21 12:33:18,155 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:33:18,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:33:18,247 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:18,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:33:18,255 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:33:18,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:33:18,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10, 10, 10] total 18 [2018-10-21 12:33:18,257 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:33:18,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:33:18,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:33:18,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:33:18,260 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-21 12:33:18,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:33:18,320 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-21 12:33:18,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:33:18,321 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-21 12:33:18,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:33:18,323 INFO L225 Difference]: With dead ends: 29 [2018-10-21 12:33:18,323 INFO L226 Difference]: Without dead ends: 24 [2018-10-21 12:33:18,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:33:18,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-21 12:33:18,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-21 12:33:18,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-21 12:33:18,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-21 12:33:18,328 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-21 12:33:18,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:33:18,329 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-21 12:33:18,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:33:18,329 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-21 12:33:18,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-21 12:33:18,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:33:18,330 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:33:18,330 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:33:18,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:33:18,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-21 12:33:18,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:33:18,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:18,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:33:18,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:33:18,332 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:33:18,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-21 12:33:18,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-21 12:33:18,372 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-21 12:33:18,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:33:18 BoogieIcfgContainer [2018-10-21 12:33:18,401 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:33:18,401 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:33:18,401 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:33:18,401 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:33:18,402 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:33:13" (3/4) ... [2018-10-21 12:33:18,405 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-21 12:33:18,474 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:33:18,477 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:33:18,478 INFO L168 Benchmark]: Toolchain (without parser) took 6145.29 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 160.4 MB). Free memory was 953.2 MB in the beginning and 853.6 MB in the end (delta: 99.6 MB). Peak memory consumption was 260.1 MB. Max. memory is 11.5 GB. [2018-10-21 12:33:18,479 INFO L168 Benchmark]: CDTParser took 0.19 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 12:33:18,479 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.06 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:33:18,482 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.60 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:33:18,482 INFO L168 Benchmark]: Boogie Preprocessor took 20.26 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:33:18,483 INFO L168 Benchmark]: RCFGBuilder took 332.21 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 160.4 MB). Free memory was 942.5 MB in the beginning and 1.1 GB in the end (delta: -202.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. [2018-10-21 12:33:18,484 INFO L168 Benchmark]: TraceAbstraction took 5376.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 860.3 MB in the end (delta: 284.5 MB). Peak memory consumption was 284.5 MB. Max. memory is 11.5 GB. [2018-10-21 12:33:18,484 INFO L168 Benchmark]: Witness Printer took 75.75 ms. Allocated memory is still 1.2 GB. Free memory was 860.3 MB in the beginning and 853.6 MB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:33:18,495 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 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 311.06 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 23.60 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 20.26 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 332.21 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 160.4 MB). Free memory was 942.5 MB in the beginning and 1.1 GB in the end (delta: -202.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5376.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 860.3 MB in the end (delta: 284.5 MB). Peak memory consumption was 284.5 MB. Max. memory is 11.5 GB. * Witness Printer took 75.75 ms. Allocated memory is still 1.2 GB. Free memory was 860.3 MB in the beginning and 853.6 MB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L9] unsigned int x = 0; [L10] unsigned int y = 1; VAL [x=0, y=1] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=1, y=2] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=2, y=4] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=3, y=8] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=4, y=16] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=5, y=32] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=6, y=64] [L11] COND FALSE !(x < 6) VAL [x=6, y=64] [L15] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L3] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L4] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. UNSAFE Result, 5.3s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 0.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 0 SDslu, 239 SDs, 0 SdLazy, 133 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 371 GetRequests, 284 SyntacticMatches, 26 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.4s InterpolantComputationTime, 299 NumberOfCodeBlocks, 299 NumberOfCodeBlocksAsserted, 38 NumberOfCheckSat, 419 ConstructedInterpolants, 0 QuantifiedInterpolants, 30581 SizeOfPredicates, 10 NumberOfNonLiveVariables, 430 ConjunctsInSsa, 145 ConjunctsInUnsatCore, 27 InterpolantComputations, 2 PerfectInterpolantSequences, 0/350 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...