java -Xmx8000000000 -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 ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:04:58,461 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:04:58,463 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:04:58,484 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:04:58,484 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:04:58,485 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:04:58,486 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:04:58,488 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:04:58,490 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:04:58,491 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:04:58,492 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:04:58,492 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:04:58,493 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:04:58,494 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:04:58,495 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:04:58,496 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:04:58,498 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:04:58,501 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:04:58,506 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:04:58,509 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:04:58,511 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:04:58,515 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:04:58,520 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:04:58,520 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:04:58,520 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:04:58,521 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:04:58,525 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:04:58,526 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:04:58,526 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:04:58,530 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:04:58,531 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:04:58,532 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:04:58,535 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:04:58,563 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:04:58,564 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:04:58,565 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:04:58,565 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:04:58,565 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:04:58,565 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:04:58,565 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:04:58,566 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:04:58,566 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:04:58,566 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:04:58,566 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:04:58,566 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:04:58,569 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:04:58,570 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:04:58,570 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:04:58,570 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:04:58,570 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:04:58,571 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:04:58,571 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:04:58,571 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:04:58,571 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:04:58,571 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:04:58,572 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:04:58,573 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:04:58,574 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:04:58,574 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:04:58,574 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:04:58,574 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:04:58,575 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:04:58,630 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:04:58,643 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:04:58,647 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:04:58,649 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:04:58,649 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:04:58,650 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i [2018-10-24 12:04:58,720 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1c8c49e69/da5435d5c2db45f0b96346f0bbb05bc2/FLAG4c0a45b10 [2018-10-24 12:04:59,266 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:04:59,267 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i [2018-10-24 12:04:59,273 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1c8c49e69/da5435d5c2db45f0b96346f0bbb05bc2/FLAG4c0a45b10 [2018-10-24 12:04:59,287 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1c8c49e69/da5435d5c2db45f0b96346f0bbb05bc2 [2018-10-24 12:04:59,299 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:04:59,300 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:04:59,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:59,302 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:04:59,306 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:04:59,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,310 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68ac229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59, skipping insertion in model container [2018-10-24 12:04:59,310 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,322 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:04:59,342 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:04:59,509 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:59,513 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:04:59,531 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:59,548 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:04:59,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59 WrapperNode [2018-10-24 12:04:59,549 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:59,550 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:59,550 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:04:59,550 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:04:59,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,567 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,574 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:59,575 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:04:59,575 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:04:59,575 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:04:59,586 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,594 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,602 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (1/1) ... [2018-10-24 12:04:59,604 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:04:59,605 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:04:59,605 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:04:59,605 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:04:59,606 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (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 [2018-10-24 12:04:59,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:04:59,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:04:59,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:04:59,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:04:59,686 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:04:59,687 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:04:59,687 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:04:59,687 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:05:00,005 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:05:00,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:05:00 BoogieIcfgContainer [2018-10-24 12:05:00,006 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:05:00,008 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:05:00,008 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:05:00,011 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:05:00,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:04:59" (1/3) ... [2018-10-24 12:05:00,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d078df7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:05:00, skipping insertion in model container [2018-10-24 12:05:00,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:59" (2/3) ... [2018-10-24 12:05:00,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d078df7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:05:00, skipping insertion in model container [2018-10-24 12:05:00,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:05:00" (3/3) ... [2018-10-24 12:05:00,015 INFO L112 eAbstractionObserver]: Analyzing ICFG sum03_false-unreach-call_true-termination.i [2018-10-24 12:05:00,027 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:05:00,037 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:05:00,073 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:05:00,160 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:05:00,161 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:05:00,161 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:05:00,161 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:05:00,161 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:05:00,161 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:05:00,161 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:05:00,162 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:05:00,190 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-24 12:05:00,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:05:00,196 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:00,197 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:00,200 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:00,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:00,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1231955355, now seen corresponding path program 1 times [2018-10-24 12:05:00,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:00,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:00,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:00,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:00,262 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:00,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:00,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:00,542 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:05:00,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:05:00,543 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:05:00,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:05:00,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:05:00,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:05:00,564 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2018-10-24 12:05:00,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:00,756 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2018-10-24 12:05:00,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:05:00,758 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-24 12:05:00,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:00,767 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:05:00,768 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:05:00,772 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:05:00,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:05:00,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-24 12:05:00,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:05:00,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-24 12:05:00,818 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 13 [2018-10-24 12:05:00,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:00,819 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-24 12:05:00,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:05:00,819 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-24 12:05:00,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:05:00,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:00,821 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:00,821 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:00,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:00,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1174697053, now seen corresponding path program 1 times [2018-10-24 12:05:00,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:00,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:00,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:00,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:00,824 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:00,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:00,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:00,940 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:05:00,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:05:00,946 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:05:00,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:05:00,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:05:00,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:05:00,949 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2018-10-24 12:05:01,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:01,181 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-10-24 12:05:01,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:05:01,182 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-24 12:05:01,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:01,185 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:05:01,185 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:05:01,187 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:05:01,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:05:01,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-24 12:05:01,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:05:01,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2018-10-24 12:05:01,197 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2018-10-24 12:05:01,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:01,197 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2018-10-24 12:05:01,197 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:05:01,197 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2018-10-24 12:05:01,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 12:05:01,198 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:01,199 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:01,199 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:01,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:01,200 INFO L82 PathProgramCache]: Analyzing trace with hash -494238111, now seen corresponding path program 1 times [2018-10-24 12:05:01,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:01,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:01,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:01,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:01,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:01,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:01,331 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:01,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:01,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:01,332 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 23 with the following transitions: [2018-10-24 12:05:01,334 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [14], [17], [19], [21], [27], [30], [32], [35], [37], [38], [39], [40], [42], [43] [2018-10-24 12:05:01,382 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:05:01,383 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:05:01,500 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:02,300 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:02,301 INFO L272 AbstractInterpreter]: Visited 17 different actions 331 times. Merged at 6 different actions 113 times. Widened at 1 different actions 13 times. Found 17 fixpoints after 2 different actions. Largest state had 7 variables. [2018-10-24 12:05:02,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:02,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,347 INFO L194 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 [2018-10-24 12:05:02,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:02,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:02,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:02,466 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:02,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:02,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:02,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:02,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:05:02,566 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:02,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:05:02,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:05:02,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:05:02,568 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 4 states. [2018-10-24 12:05:02,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:02,653 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2018-10-24 12:05:02,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:05:02,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2018-10-24 12:05:02,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:02,656 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:05:02,656 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:05:02,657 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:05:02,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:05:02,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:05:02,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:05:02,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2018-10-24 12:05:02,671 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 22 [2018-10-24 12:05:02,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:02,673 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2018-10-24 12:05:02,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:05:02,673 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2018-10-24 12:05:02,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:05:02,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:02,676 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:02,676 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:02,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,676 INFO L82 PathProgramCache]: Analyzing trace with hash -2135506589, now seen corresponding path program 2 times [2018-10-24 12:05:02,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:02,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:02,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:02,844 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:05:02,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:02,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:02,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:02,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:02,865 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:02,865 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:03,035 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:05:03,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:03,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:03,112 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:05:03,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:03,266 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:05:03,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:03,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:05:03,288 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:03,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:05:03,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:05:03,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:05:03,290 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 5 states. [2018-10-24 12:05:03,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:03,426 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2018-10-24 12:05:03,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:05:03,427 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-10-24 12:05:03,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:03,429 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:05:03,430 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:05:03,431 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:05:03,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:05:03,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:05:03,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:05:03,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2018-10-24 12:05:03,440 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2018-10-24 12:05:03,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:03,440 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2018-10-24 12:05:03,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:05:03,441 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2018-10-24 12:05:03,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:05:03,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:03,442 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:03,442 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:03,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:03,443 INFO L82 PathProgramCache]: Analyzing trace with hash -374355807, now seen corresponding path program 3 times [2018-10-24 12:05:03,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:03,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:03,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,445 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:03,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:03,730 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:05:03,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:03,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:03,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:03,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,732 INFO L194 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 [2018-10-24 12:05:03,749 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:03,750 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:03,780 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:03,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:03,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:03,817 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:05:03,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:04,032 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:05:04,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:04,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:05:04,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:04,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:05:04,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:05:04,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:05:04,056 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 6 states. [2018-10-24 12:05:04,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:04,454 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2018-10-24 12:05:04,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:05:04,455 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2018-10-24 12:05:04,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:04,457 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:05:04,457 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 12:05:04,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:05:04,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 12:05:04,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2018-10-24 12:05:04,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:05:04,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2018-10-24 12:05:04,467 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 40 [2018-10-24 12:05:04,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:04,467 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2018-10-24 12:05:04,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:05:04,467 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2018-10-24 12:05:04,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:05:04,469 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:04,469 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:04,470 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:04,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:04,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1263007965, now seen corresponding path program 4 times [2018-10-24 12:05:04,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:04,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:04,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:04,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:04,472 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:04,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:04,679 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:05:04,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:04,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:04,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:04,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:04,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:04,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:04,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:04,690 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:04,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:04,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:04,788 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:05:04,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:05,010 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:05:05,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:05,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:05:05,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:05,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:05:05,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:05:05,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:05:05,035 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 7 states. [2018-10-24 12:05:05,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:05,163 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2018-10-24 12:05:05,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:05:05,164 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 49 [2018-10-24 12:05:05,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:05,166 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:05:05,166 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:05:05,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:05:05,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:05:05,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-24 12:05:05,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:05:05,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2018-10-24 12:05:05,176 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 49 [2018-10-24 12:05:05,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:05,177 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2018-10-24 12:05:05,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:05:05,177 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2018-10-24 12:05:05,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:05:05,179 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:05,179 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:05,179 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:05,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:05,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1453262111, now seen corresponding path program 5 times [2018-10-24 12:05:05,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:05,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:05,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,182 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:05,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:05,406 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:05:05,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,406 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:05,407 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:05,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:05,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,407 INFO L194 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 [2018-10-24 12:05:05,415 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:05,415 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:07,379 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:05:07,380 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:07,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:07,580 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 23 proven. 74 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:05:07,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:08,078 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-10-24 12:05:08,681 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 23 proven. 74 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:05:08,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:08,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 14] total 26 [2018-10-24 12:05:08,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:08,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:05:08,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:05:08,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=483, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:05:08,710 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand 15 states. [2018-10-24 12:05:09,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:09,073 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2018-10-24 12:05:09,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:05:09,074 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 58 [2018-10-24 12:05:09,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:09,075 INFO L225 Difference]: With dead ends: 67 [2018-10-24 12:05:09,075 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 12:05:09,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=172, Invalid=530, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:05:09,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 12:05:09,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-10-24 12:05:09,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:05:09,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2018-10-24 12:05:09,085 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 58 [2018-10-24 12:05:09,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:09,085 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2018-10-24 12:05:09,086 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:05:09,086 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2018-10-24 12:05:09,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:05:09,088 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:09,088 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:09,088 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:09,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:09,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1989893347, now seen corresponding path program 6 times [2018-10-24 12:05:09,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:09,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:09,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:09,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:09,090 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:09,315 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 24 proven. 93 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:05:09,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:09,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:09,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:09,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:09,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:09,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:09,326 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:09,327 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:09,353 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:09,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:09,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:09,399 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 24 proven. 93 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:05:09,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:10,205 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 24 proven. 93 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:05:10,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:10,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:05:10,231 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:10,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:05:10,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:05:10,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:10,233 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand 9 states. [2018-10-24 12:05:10,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:10,363 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2018-10-24 12:05:10,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:05:10,365 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 67 [2018-10-24 12:05:10,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:10,367 INFO L225 Difference]: With dead ends: 70 [2018-10-24 12:05:10,367 INFO L226 Difference]: Without dead ends: 59 [2018-10-24 12:05:10,368 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:10,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-24 12:05:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2018-10-24 12:05:10,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:05:10,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2018-10-24 12:05:10,377 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 67 [2018-10-24 12:05:10,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:10,377 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2018-10-24 12:05:10,377 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:05:10,377 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2018-10-24 12:05:10,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:05:10,379 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:10,379 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:10,379 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:10,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:10,380 INFO L82 PathProgramCache]: Analyzing trace with hash -259908319, now seen corresponding path program 7 times [2018-10-24 12:05:10,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:10,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:10,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:10,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:10,381 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:10,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:10,592 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 126 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:05:10,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:10,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:10,593 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:10,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:10,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:10,594 INFO L194 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 [2018-10-24 12:05:10,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:10,602 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:10,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:10,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:10,686 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 126 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:05:10,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:11,004 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 126 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:05:11,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:11,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:05:11,026 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:11,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:05:11,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:05:11,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:05:11,028 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 10 states. [2018-10-24 12:05:11,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:11,393 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2018-10-24 12:05:11,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:05:11,394 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 76 [2018-10-24 12:05:11,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:11,395 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:05:11,396 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:05:11,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 144 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:05:11,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:05:11,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-24 12:05:11,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:05:11,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2018-10-24 12:05:11,406 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 76 [2018-10-24 12:05:11,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:11,406 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2018-10-24 12:05:11,407 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:05:11,407 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2018-10-24 12:05:11,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:05:11,408 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:11,408 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:11,409 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:11,409 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:11,409 INFO L82 PathProgramCache]: Analyzing trace with hash 2013053603, now seen corresponding path program 8 times [2018-10-24 12:05:11,409 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:11,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:11,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:11,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:11,411 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:11,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:12,423 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 32 proven. 164 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:05:12,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:12,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:12,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:12,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:12,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:12,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:12,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:12,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:17,672 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:05:17,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:17,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:17,733 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 32 proven. 164 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:05:17,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:18,065 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 32 proven. 164 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:05:18,091 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:18,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:05:18,092 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:18,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:05:18,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:05:18,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:05:18,093 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand 11 states. [2018-10-24 12:05:18,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:18,351 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2018-10-24 12:05:18,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:05:18,352 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 85 [2018-10-24 12:05:18,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:18,354 INFO L225 Difference]: With dead ends: 80 [2018-10-24 12:05:18,354 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:05:18,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:05:18,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:05:18,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-24 12:05:18,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:05:18,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2018-10-24 12:05:18,364 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 85 [2018-10-24 12:05:18,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:18,365 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2018-10-24 12:05:18,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:05:18,365 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2018-10-24 12:05:18,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:05:18,367 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:18,367 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:18,367 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:18,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:18,367 INFO L82 PathProgramCache]: Analyzing trace with hash 485961569, now seen corresponding path program 9 times [2018-10-24 12:05:18,368 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:18,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:18,369 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:18,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:18,369 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:18,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:18,791 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 36 proven. 207 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:05:18,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:18,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:18,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:18,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:18,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:18,792 INFO L194 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 [2018-10-24 12:05:18,800 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:18,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:18,857 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:18,857 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:18,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:18,934 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 36 proven. 207 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:05:18,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:19,256 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 36 proven. 207 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:05:19,280 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:19,280 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:05:19,280 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:19,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:05:19,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:05:19,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:05:19,281 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand 12 states. [2018-10-24 12:05:19,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:19,629 INFO L93 Difference]: Finished difference Result 85 states and 98 transitions. [2018-10-24 12:05:19,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:05:19,630 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 94 [2018-10-24 12:05:19,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:19,632 INFO L225 Difference]: With dead ends: 85 [2018-10-24 12:05:19,632 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:05:19,633 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 178 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:05:19,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:05:19,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2018-10-24 12:05:19,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-10-24 12:05:19,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2018-10-24 12:05:19,642 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 94 [2018-10-24 12:05:19,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:19,643 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2018-10-24 12:05:19,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:05:19,643 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2018-10-24 12:05:19,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-24 12:05:19,645 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:19,645 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:19,645 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:19,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:19,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1149749149, now seen corresponding path program 10 times [2018-10-24 12:05:19,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:19,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:19,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:19,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:19,647 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:19,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 12:05:19,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 12:05:19,742 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-24 12:05:19,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:05:19 BoogieIcfgContainer [2018-10-24 12:05:19,788 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:05:19,789 INFO L168 Benchmark]: Toolchain (without parser) took 20489.80 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 863.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -652.5 MB). Peak memory consumption was 211.0 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:19,790 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:05:19,791 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:19,792 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.86 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:05:19,792 INFO L168 Benchmark]: Boogie Preprocessor took 29.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:05:19,793 INFO L168 Benchmark]: RCFGBuilder took 402.08 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:19,794 INFO L168 Benchmark]: TraceAbstraction took 19780.55 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 141.6 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 114.1 MB). Peak memory consumption was 255.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:19,802 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.86 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 402.08 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 19780.55 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 141.6 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 114.1 MB). Peak memory consumption was 255.6 MB. Max. memory is 7.1 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: [L10] int sn=0; [L11] unsigned int loop1=__VERIFIER_nondet_uint(), n1=__VERIFIER_nondet_uint(); [L11] unsigned int loop1=__VERIFIER_nondet_uint(), n1=__VERIFIER_nondet_uint(); [L12] unsigned int x=0; VAL [loop1=2, n1=3, sn=0, x=0] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=0, x=0] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=2, x=0] [L17] x++ VAL [loop1=2, n1=3, sn=2, x=1] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=2, x=1] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=2, x=1] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=4, x=1] [L17] x++ VAL [loop1=2, n1=3, sn=4, x=2] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=4, x=2] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=4, x=2] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=6, x=2] [L17] x++ VAL [loop1=2, n1=3, sn=6, x=3] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=6, x=3] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=6, x=3] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=8, x=3] [L17] x++ VAL [loop1=2, n1=3, sn=8, x=4] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=8, x=4] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=8, x=4] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=10, x=4] [L17] x++ VAL [loop1=2, n1=3, sn=10, x=5] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=10, x=5] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=10, x=5] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=12, x=5] [L17] x++ VAL [loop1=2, n1=3, sn=12, x=6] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=12, x=6] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=12, x=6] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=14, x=6] [L17] x++ VAL [loop1=2, n1=3, sn=14, x=7] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=14, x=7] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=14, x=7] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=16, x=7] [L17] x++ VAL [loop1=2, n1=3, sn=16, x=8] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=16, x=8] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=16, x=8] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=18, x=8] [L17] x++ VAL [loop1=2, n1=3, sn=18, x=9] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=18, x=9] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=18, x=9] [L14] COND TRUE x<10 [L15] sn = sn + (2) VAL [loop1=2, n1=3, sn=20, x=9] [L17] x++ VAL [loop1=2, n1=3, sn=20, x=10] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [\old(cond)=1] [L3] COND FALSE, RET !(!(cond)) VAL [\old(cond)=1, cond=1] [L18] __VERIFIER_assert(sn==x*(2) || sn == 0) VAL [loop1=2, n1=3, sn=20, x=10] [L13] COND TRUE 1 VAL [loop1=2, n1=3, sn=20, x=10] [L14] COND FALSE !(x<10) VAL [loop1=2, n1=3, sn=20, x=10] [L17] x++ VAL [loop1=2, n1=3, sn=20, x=11] [L18] CALL __VERIFIER_assert(sn==x*(2) || sn == 0) 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, 20 locations, 1 error locations. UNSAFE Result, 19.6s OverallTime, 12 OverallIterations, 11 TraceHistogramMax, 2.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 328 SDtfs, 28 SDslu, 1681 SDs, 0 SdLazy, 1338 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1131 GetRequests, 982 SyntacticMatches, 19 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 5.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=73occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.0s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 12 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 7.7s SatisfiabilityAnalysisTime, 7.1s InterpolantComputationTime, 1173 NumberOfCodeBlocks, 1173 NumberOfCodeBlocksAsserted, 39 NumberOfCheckSat, 1563 ConstructedInterpolants, 0 QuantifiedInterpolants, 433008 SizeOfPredicates, 11 NumberOfNonLiveVariables, 1008 ConjunctsInSsa, 129 ConjunctsInUnsatCore, 29 InterpolantComputations, 2 PerfectInterpolantSequences, 1962/4185 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...