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/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:05:19,513 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:05:19,515 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:05:19,527 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:05:19,527 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:05:19,528 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:05:19,530 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:05:19,541 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:05:19,543 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:05:19,543 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:05:19,545 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:05:19,545 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:05:19,546 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:05:19,547 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:05:19,548 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:05:19,549 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:05:19,550 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:05:19,551 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:05:19,553 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:05:19,555 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:05:19,556 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:05:19,557 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:05:19,560 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:05:19,560 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:05:19,560 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:05:19,561 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:05:19,562 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:05:19,563 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:05:19,564 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:05:19,565 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:05:19,565 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:05:19,566 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:05:19,568 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 [2018-10-22 16:05:19,583 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:05:19,584 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:05:19,584 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:05:19,585 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:05:19,585 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:05:19,585 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:05:19,585 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:05:19,585 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:05:19,586 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:05:19,586 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:05:19,586 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:05:19,586 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:05:19,587 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:05:19,587 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:05:19,587 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:05:19,587 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:05:19,587 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:05:19,588 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:05:19,588 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:05:19,588 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:05:19,588 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:05:19,588 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:05:19,589 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:05:19,589 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:05:19,589 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:05:19,589 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:05:19,590 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:05:19,590 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:05:19,590 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:05:19,590 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:05:19,590 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:05:19,591 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:05:19,591 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:05:19,591 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:05:19,659 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:05:19,675 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:05:19,680 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:05:19,682 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:05:19,682 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:05:19,683 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-22 16:05:19,754 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0ecb4ec58/40456c3531754b5f94e7e283ac5b7d2a/FLAG54ac6d3bb [2018-10-22 16:05:20,239 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:05:20,240 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-22 16:05:20,249 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0ecb4ec58/40456c3531754b5f94e7e283ac5b7d2a/FLAG54ac6d3bb [2018-10-22 16:05:20,265 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0ecb4ec58/40456c3531754b5f94e7e283ac5b7d2a [2018-10-22 16:05:20,276 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:05:20,278 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:05:20,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:05:20,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:05:20,283 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:05:20,284 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,287 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3354c03c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20, skipping insertion in model container [2018-10-22 16:05:20,287 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,297 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:05:20,316 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:05:20,503 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:05:20,509 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:05:20,532 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:05:20,557 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:05:20,558 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20 WrapperNode [2018-10-22 16:05:20,558 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:05:20,559 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:05:20,559 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:05:20,559 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:05:20,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,580 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,603 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:05:20,604 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:05:20,604 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:05:20,604 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:05:20,615 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,615 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,617 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,622 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,627 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,629 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (1/1) ... [2018-10-22 16:05:20,631 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:05:20,631 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:05:20,632 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:05:20,632 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:05:20,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (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 [2018-10-22 16:05:20,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:05:20,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:05:20,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:05:20,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:05:20,788 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:05:20,788 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:05:20,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:05:20,788 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:05:21,286 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:05:21,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:05:21 BoogieIcfgContainer [2018-10-22 16:05:21,286 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:05:21,290 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:05:21,290 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:05:21,298 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:05:21,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:05:20" (1/3) ... [2018-10-22 16:05:21,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c97ca75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:05:21, skipping insertion in model container [2018-10-22 16:05:21,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:20" (2/3) ... [2018-10-22 16:05:21,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c97ca75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:05:21, skipping insertion in model container [2018-10-22 16:05:21,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:05:21" (3/3) ... [2018-10-22 16:05:21,302 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-22 16:05:21,310 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:05:21,319 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:05:21,336 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:05:21,371 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:05:21,371 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:05:21,372 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:05:21,372 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:05:21,372 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:05:21,372 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:05:21,372 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:05:21,372 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:05:21,373 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:05:21,392 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2018-10-22 16:05:21,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:05:21,398 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:21,399 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:21,402 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:21,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:21,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1193744236, now seen corresponding path program 1 times [2018-10-22 16:05:21,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:21,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:21,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,469 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:21,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:21,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:21,563 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:05:21,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:05:21,563 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:05:21,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:05:21,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:05:21,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:05:21,585 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2018-10-22 16:05:21,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:21,607 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2018-10-22 16:05:21,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:05:21,609 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-22 16:05:21,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:21,623 INFO L225 Difference]: With dead ends: 43 [2018-10-22 16:05:21,623 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:05:21,630 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:05:21,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:05:21,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-22 16:05:21,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:05:21,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-22 16:05:21,671 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 14 [2018-10-22 16:05:21,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:21,672 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-22 16:05:21,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:05:21,672 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-22 16:05:21,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:05:21,673 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:21,673 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:21,674 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:21,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:21,675 INFO L82 PathProgramCache]: Analyzing trace with hash 1255135895, now seen corresponding path program 1 times [2018-10-22 16:05:21,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:21,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:21,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,678 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:21,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:21,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:21,802 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:05:21,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:05:21,803 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:05:21,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:05:21,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:05:21,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:05:21,806 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 3 states. [2018-10-22 16:05:21,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:21,911 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2018-10-22 16:05:21,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:05:21,912 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-22 16:05:21,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:21,915 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:05:21,915 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:05:21,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:05:21,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:05:21,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2018-10-22 16:05:21,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:05:21,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-22 16:05:21,927 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 15 [2018-10-22 16:05:21,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:21,927 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-22 16:05:21,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:05:21,927 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-22 16:05:21,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:05:21,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:21,928 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:21,928 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:21,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:21,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1812131568, now seen corresponding path program 1 times [2018-10-22 16:05:21,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:21,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:21,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:21,931 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:21,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:22,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:22,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:22,089 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:22,090 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:05:22,092 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [39], [42], [44], [50], [51], [52], [54] [2018-10-22 16:05:22,149 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:05:22,150 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:05:22,342 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:05:23,423 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:05:23,425 INFO L272 AbstractInterpreter]: Visited 17 different actions 165 times. Merged at 4 different actions 118 times. Widened at 1 different actions 26 times. Found 29 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-22 16:05:23,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:23,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:05:23,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:23,471 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:23,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:23,489 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:23,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:23,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:23,629 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 16:05:23,642 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 16:05:23,642 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,647 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,662 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,662 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:17, output treesize:9 [2018-10-22 16:05:23,760 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-22 16:05:23,784 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:05:23,786 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:05:23,787 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,853 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,933 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:23,933 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:26, output treesize:9 [2018-10-22 16:05:24,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:24,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:24,274 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:05:24,393 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2018-10-22 16:05:24,396 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-22 16:05:24,401 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:24,410 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:24,416 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:05:24,417 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:26, output treesize:15 [2018-10-22 16:05:25,540 WARN L179 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:05:25,550 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:25,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:25,574 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:25,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:25,593 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:25,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:25,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:25,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:25,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:26,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:26,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:26,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8, 4, 4] total 16 [2018-10-22 16:05:26,879 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:26,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:05:26,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:05:26,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=191, Unknown=1, NotChecked=0, Total=240 [2018-10-22 16:05:26,881 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2018-10-22 16:05:27,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:27,510 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2018-10-22 16:05:27,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:05:27,510 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-22 16:05:27,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:27,512 INFO L225 Difference]: With dead ends: 53 [2018-10-22 16:05:27,512 INFO L226 Difference]: Without dead ends: 41 [2018-10-22 16:05:27,513 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=71, Invalid=270, Unknown=1, NotChecked=0, Total=342 [2018-10-22 16:05:27,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-22 16:05:27,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2018-10-22 16:05:27,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:05:27,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-10-22 16:05:27,521 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 18 [2018-10-22 16:05:27,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:27,522 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-10-22 16:05:27,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:05:27,522 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-10-22 16:05:27,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-22 16:05:27,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:27,523 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:27,524 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:27,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:27,524 INFO L82 PathProgramCache]: Analyzing trace with hash 602547482, now seen corresponding path program 1 times [2018-10-22 16:05:27,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:27,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:27,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:27,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:27,526 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:27,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:28,064 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:05:28,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:28,065 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:28,065 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-22 16:05:28,065 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [31], [33], [39], [42], [44], [47], [49], [50], [51], [52], [54], [55] [2018-10-22 16:05:28,068 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:05:28,069 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:05:28,085 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:05:29,686 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:05:29,686 INFO L272 AbstractInterpreter]: Visited 22 different actions 500 times. Merged at 9 different actions 268 times. Widened at 2 different actions 52 times. Found 30 fixpoints after 3 different actions. Largest state had 32 variables. [2018-10-22 16:05:29,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:29,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:05:29,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:29,725 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:29,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:29,740 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:29,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:29,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:29,981 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-22 16:05:29,999 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-22 16:05:30,000 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:30,024 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:30,170 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:05:30,170 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:48, output treesize:41 [2018-10-22 16:05:33,443 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2018-10-22 16:05:33,450 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:05:33,451 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2018-10-22 16:05:33,451 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:33,460 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:33,485 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:05:33,486 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:57, output treesize:34 [2018-10-22 16:05:35,600 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:35,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:39,964 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 16 [2018-10-22 16:05:40,517 WARN L179 SmtUtils]: Spent 461.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 30 [2018-10-22 16:05:42,696 WARN L179 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 32 [2018-10-22 16:05:42,763 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2018-10-22 16:05:42,794 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2018-10-22 16:05:42,796 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:05:42,799 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:05:42,805 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:05:42,805 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:28, output treesize:15 [2018-10-22 16:05:43,191 WARN L179 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-22 16:05:43,612 WARN L179 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-10-22 16:05:43,627 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:43,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:43,648 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:43,668 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:43,668 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:43,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:43,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:43,884 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-10-22 16:05:43,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:48,223 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:05:48,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:48,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 13, 13, 5, 5] total 29 [2018-10-22 16:05:48,225 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:48,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:05:48,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:05:48,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=690, Unknown=7, NotChecked=0, Total=812 [2018-10-22 16:05:48,229 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 14 states. [2018-10-22 16:06:12,956 WARN L179 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 37 [2018-10-22 16:06:21,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:21,443 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2018-10-22 16:06:21,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:06:21,444 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2018-10-22 16:06:21,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:21,445 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:06:21,445 INFO L226 Difference]: Without dead ends: 59 [2018-10-22 16:06:21,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 91 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=168, Invalid=946, Unknown=8, NotChecked=0, Total=1122 [2018-10-22 16:06:21,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-22 16:06:21,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 45. [2018-10-22 16:06:21,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 16:06:21,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-10-22 16:06:21,456 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 30 [2018-10-22 16:06:21,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:21,456 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-10-22 16:06:21,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:06:21,456 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-10-22 16:06:21,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-22 16:06:21,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:21,458 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:21,458 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:21,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:21,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1500033328, now seen corresponding path program 2 times [2018-10-22 16:06:21,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:21,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:21,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:21,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:21,459 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:21,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:21,792 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:06:21,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:21,793 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:21,793 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:21,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:21,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:21,794 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:21,802 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:21,802 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:21,860 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:21,860 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:21,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:22,065 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-22 16:06:22,068 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-22 16:06:22,068 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,078 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:24,413 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:06:24,414 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:48, output treesize:41 [2018-10-22 16:06:27,270 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2018-10-22 16:06:27,274 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:27,274 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2018-10-22 16:06:27,275 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:27,361 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:27,375 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:06:27,376 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:57, output treesize:34 [2018-10-22 16:06:29,490 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:29,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:33,105 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 16 [2018-10-22 16:06:35,592 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 30 [2018-10-22 16:06:36,378 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2018-10-22 16:06:36,393 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2018-10-22 16:06:36,395 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:36,398 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:36,405 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:06:36,405 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:29, output treesize:16 [2018-10-22 16:06:38,525 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:06:40,754 WARN L179 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 14 [2018-10-22 16:06:40,817 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:40,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:40,839 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:40,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:40,855 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:40,964 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:40,964 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:40,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:41,271 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-10-22 16:06:41,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:51,589 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:06:51,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:51,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 15, 15, 6, 6] total 35 [2018-10-22 16:06:51,591 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:51,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:06:51,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:06:51,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1021, Unknown=8, NotChecked=0, Total=1190 [2018-10-22 16:06:51,593 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2018-10-22 16:07:10,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:10,722 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2018-10-22 16:07:10,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:07:10,727 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2018-10-22 16:07:10,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:10,728 INFO L225 Difference]: With dead ends: 89 [2018-10-22 16:07:10,728 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:07:10,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 133 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=171, Invalid=1081, Unknown=8, NotChecked=0, Total=1260 [2018-10-22 16:07:10,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:07:10,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 48. [2018-10-22 16:07:10,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:07:10,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-10-22 16:07:10,747 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 42 [2018-10-22 16:07:10,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:10,747 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-10-22 16:07:10,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:07:10,747 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-10-22 16:07:10,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 16:07:10,750 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:10,750 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:10,752 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:10,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:10,753 INFO L82 PathProgramCache]: Analyzing trace with hash -207301449, now seen corresponding path program 3 times [2018-10-22 16:07:10,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:10,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:10,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:10,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:10,754 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:10,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:11,127 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:07:11,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:11,127 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:11,127 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:11,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:11,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:11,128 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:11,135 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:11,135 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:11,269 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:07:11,269 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:11,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:11,332 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-22 16:07:11,336 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-22 16:07:11,336 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:07:11,359 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:07:11,421 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:11,422 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2018-10-22 16:07:11,470 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 30 [2018-10-22 16:07:11,488 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 50 [2018-10-22 16:07:11,490 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-22 16:07:11,503 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:07:11,522 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:11,523 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:63, output treesize:56 [2018-10-22 16:07:18,524 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 46 [2018-10-22 16:07:18,545 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 16:07:18,546 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:07:18,551 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 50 [2018-10-22 16:07:18,552 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:18,572 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:18,593 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:18,593 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:86, output treesize:32 [2018-10-22 16:07:22,768 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:07:22,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:24,253 WARN L179 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 32 [2018-10-22 16:07:28,073 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2018-10-22 16:07:28,089 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2018-10-22 16:07:28,092 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:07:28,095 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:07:28,102 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:07:28,102 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:15 [2018-10-22 16:07:32,248 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:42,455 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 14 [2018-10-22 16:07:42,472 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:07:42,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:42,496 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:42,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:42,512 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:42,850 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:07:42,851 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:42,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:43,228 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-10-22 16:07:43,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:57,217 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:07:57,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:57,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 18, 17, 7, 7] total 43 [2018-10-22 16:07:57,220 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:57,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:07:57,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:07:57,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1545, Unknown=14, NotChecked=0, Total=1806 [2018-10-22 16:07:57,222 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 21 states. [2018-10-22 16:08:06,481 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 26 [2018-10-22 16:08:19,759 WARN L179 SmtUtils]: Spent 2.84 s on a formula simplification that was a NOOP. DAG size: 43 [2018-10-22 16:08:24,938 WARN L179 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 49 [2018-10-22 16:08:29,503 WARN L179 SmtUtils]: Spent 2.27 s on a formula simplification that was a NOOP. DAG size: 61 [2018-10-22 16:08:41,657 WARN L179 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 49 [2018-10-22 16:08:53,501 WARN L179 SmtUtils]: Spent 1.91 s on a formula simplification. DAG size of input: 68 DAG size of output: 49 [2018-10-22 16:09:00,139 WARN L179 SmtUtils]: Spent 2.13 s on a formula simplification that was a NOOP. DAG size: 67 [2018-10-22 16:09:04,691 WARN L179 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 42 [2018-10-22 16:09:06,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:06,518 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2018-10-22 16:09:06,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:09:06,518 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 45 [2018-10-22 16:09:06,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:06,520 INFO L225 Difference]: With dead ends: 101 [2018-10-22 16:09:06,520 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:09:06,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 135 SyntacticMatches, 11 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 778 ImplicationChecksByTransitivity, 84.7s TimeCoverageRelationStatistics Valid=427, Invalid=2637, Unknown=16, NotChecked=0, Total=3080 [2018-10-22 16:09:06,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:09:06,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 60. [2018-10-22 16:09:06,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:09:06,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-22 16:09:06,537 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 45 [2018-10-22 16:09:06,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:06,537 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-22 16:09:06,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:09:06,538 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-22 16:09:06,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-22 16:09:06,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:06,540 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:06,540 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:06,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:06,540 INFO L82 PathProgramCache]: Analyzing trace with hash -597350463, now seen corresponding path program 4 times [2018-10-22 16:09:06,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:06,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:06,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,542 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:06,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:08,729 WARN L179 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 16 [2018-10-22 16:09:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 6 proven. 40 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-22 16:09:09,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,015 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:09,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:09,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:09,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,015 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:09,024 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:09,025 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:09,065 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:09,065 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:09,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:09,293 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-22 16:09:09,298 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-22 16:09:09,299 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:09,301 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:11,527 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:09:11,527 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2018-10-22 16:09:11,622 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2018-10-22 16:09:11,669 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 38 [2018-10-22 16:09:11,671 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-22 16:09:11,695 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:11,730 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 3 dim-0 vars, and 1 xjuncts. [2018-10-22 16:09:11,731 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:66, output treesize:59 [2018-10-22 16:09:14,333 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2018-10-22 16:09:14,358 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:09:14,359 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2018-10-22 16:09:14,360 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:14,382 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:14,397 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:09:14,397 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:55, output treesize:32 [2018-10-22 16:09:18,605 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 73 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:09:18,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:21,692 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 16 [2018-10-22 16:09:23,557 WARN L179 SmtUtils]: Spent 1.35 s on a formula simplification. DAG size of input: 56 DAG size of output: 30 [2018-10-22 16:09:25,929 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:25,933 FATAL L265 ToolchainWalker]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. No stderr output. at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:225) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.WrapperScript.checkSat(WrapperScript.java:116) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.WrapperScript.checkSat(WrapperScript.java:116) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:61) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.getRedundancy(SimplifyDDA.java:626) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.SimplifyDDAWithTimeout.getRedundancy(SimplifyDDAWithTimeout.java:122) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA$Simplifier.walk(SimplifyDDA.java:371) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:122) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:113) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.simplifyOnce(SimplifyDDA.java:650) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.SimplifyDDAWithTimeout.getSimplifiedTerm(SimplifyDDAWithTimeout.java:187) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.SmtUtils.simplify(SmtUtils.java:150) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:354) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:299) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp$UnifyPostprocessor.postprocess(TraceCheckSpWp.java:575) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:418) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:290) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructForwardBackward(TraceCheckConstructor.java:224) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructTraceCheck(TraceCheckConstructor.java:188) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.get(TraceCheckConstructor.java:165) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseTaipanRefinementStrategy.getTraceCheck(BaseTaipanRefinementStrategy.java:223) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.checkFeasibility(BaseRefinementStrategy.java:223) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.executeStrategy(BaseRefinementStrategy.java:197) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:70) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:435) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:376) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:123) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1427) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:630) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:419) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:205) ... 46 more [2018-10-22 16:09:25,938 INFO L168 Benchmark]: Toolchain (without parser) took 245661.10 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 978.3 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -924.3 MB). Peak memory consumption was 54.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:09:25,939 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:09:25,939 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.51 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. [2018-10-22 16:09:25,940 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.55 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. [2018-10-22 16:09:25,940 INFO L168 Benchmark]: Boogie Preprocessor took 27.32 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. [2018-10-22 16:09:25,941 INFO L168 Benchmark]: RCFGBuilder took 655.12 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 729.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -785.9 MB). Peak memory consumption was 24.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:09:25,942 INFO L168 Benchmark]: TraceAbstraction took 244647.03 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 249.0 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -148.9 MB). Peak memory consumption was 100.1 MB. Max. memory is 7.1 GB. [2018-10-22 16:09:25,949 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 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.51 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 44.55 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 27.32 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 655.12 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 729.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -785.9 MB). Peak memory consumption was 24.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 244647.03 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 249.0 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -148.9 MB). Peak memory consumption was 100.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. No stderr output. de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. No stderr output.: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...