java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/linear_search_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:04:51,561 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:04:51,563 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:04:51,581 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:04:51,582 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:04:51,584 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:04:51,585 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:04:51,588 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:04:51,591 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:04:51,600 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:04:51,601 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:04:51,601 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:04:51,602 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:04:51,606 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:04:51,609 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:04:51,610 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:04:51,611 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:04:51,614 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:04:51,620 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:04:51,621 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:04:51,622 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:04:51,624 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:04:51,627 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:04:51,628 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:04:51,628 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:04:51,629 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:04:51,630 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:04:51,631 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:04:51,633 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:04:51,635 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:04:51,636 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:04:51,637 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:04:51,637 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:04:51,637 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:04:51,640 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:04:51,640 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:04:51,641 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:04:51,656 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:04:51,656 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:04:51,657 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:04:51,657 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:04:51,658 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:04:51,658 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:04:51,658 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:04:51,658 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:04:51,658 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:04:51,659 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:04:51,659 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:04:51,659 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:04:51,660 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:04:51,660 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:04:51,660 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:04:51,660 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:04:51,661 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:04:51,661 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:04:51,661 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:04:51,661 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:04:51,661 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:04:51,662 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:04:51,662 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:04:51,662 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:04:51,662 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:04:51,663 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:04:51,663 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:04:51,663 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:04:51,663 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:04:51,663 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:04:51,664 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:04:51,664 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:04:51,664 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:04:51,664 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:04:51,709 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:04:51,722 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:04:51,727 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:04:51,728 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:04:51,729 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:04:51,729 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/linear_search_false-unreach-call.i [2018-10-24 12:04:51,789 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7fa972899/205046614fe743d6b5e1497e61e09523/FLAG2b9832f95 [2018-10-24 12:04:52,267 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:04:52,267 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_search_false-unreach-call.i [2018-10-24 12:04:52,274 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7fa972899/205046614fe743d6b5e1497e61e09523/FLAG2b9832f95 [2018-10-24 12:04:52,288 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7fa972899/205046614fe743d6b5e1497e61e09523 [2018-10-24 12:04:52,300 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:04:52,302 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:04:52,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:52,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:04:52,306 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:04:52,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ba4e0b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52, skipping insertion in model container [2018-10-24 12:04:52,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:04:52,343 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:04:52,538 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:52,549 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:04:52,570 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:52,588 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:04:52,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52 WrapperNode [2018-10-24 12:04:52,589 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:52,590 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:52,590 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:04:52,590 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:04:52,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,607 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,630 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:52,631 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:04:52,631 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:04:52,631 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:04:52,641 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,644 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,644 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,650 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:04:52,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:04:52,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:04:52,670 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:04:52,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:04:52,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:04:52,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:04:52,811 INFO L130 BoogieDeclarations]: Found specification of procedure linear_search [2018-10-24 12:04:52,811 INFO L138 BoogieDeclarations]: Found implementation of procedure linear_search [2018-10-24 12:04:52,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:04:52,812 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:04:52,812 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:04:52,812 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:04:52,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:04:52,813 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:04:53,228 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:04:53,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:53 BoogieIcfgContainer [2018-10-24 12:04:53,229 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:04:53,230 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:04:53,230 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:04:53,233 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:04:53,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:04:52" (1/3) ... [2018-10-24 12:04:53,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1389a960 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:53, skipping insertion in model container [2018-10-24 12:04:53,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (2/3) ... [2018-10-24 12:04:53,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1389a960 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:53, skipping insertion in model container [2018-10-24 12:04:53,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:53" (3/3) ... [2018-10-24 12:04:53,237 INFO L112 eAbstractionObserver]: Analyzing ICFG linear_search_false-unreach-call.i [2018-10-24 12:04:53,246 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:04:53,253 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:04:53,268 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:04:53,303 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:04:53,303 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:04:53,303 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:04:53,303 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:04:53,303 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:04:53,303 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:04:53,304 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:04:53,304 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:04:53,323 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-24 12:04:53,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:04:53,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:53,331 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:53,333 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:53,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:53,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1855752643, now seen corresponding path program 1 times [2018-10-24 12:04:53,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:53,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:53,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,396 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:53,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:53,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:53,539 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:53,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:04:53,540 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:53,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:04:53,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:04:53,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:04:53,560 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-24 12:04:53,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:53,584 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2018-10-24 12:04:53,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:04:53,586 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-10-24 12:04:53,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:53,597 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:04:53,597 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:04:53,602 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 [2018-10-24 12:04:53,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:04:53,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 12:04:53,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 12:04:53,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2018-10-24 12:04:53,649 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2018-10-24 12:04:53,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:53,650 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2018-10-24 12:04:53,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:04:53,651 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2018-10-24 12:04:53,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:04:53,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:53,653 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:53,653 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:53,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:53,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1049182020, now seen corresponding path program 1 times [2018-10-24 12:04:53,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:53,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:53,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,658 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:53,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:54,156 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2018-10-24 12:04:54,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:54,382 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:54,383 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:04:54,383 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:54,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:04:54,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:04:54,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:04:54,386 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2018-10-24 12:04:54,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:54,833 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-24 12:04:54,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:04:54,834 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:04:54,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:54,838 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:04:54,839 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:04:54,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:04:54,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:04:54,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2018-10-24 12:04:54,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:04:54,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2018-10-24 12:04:54,849 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 20 [2018-10-24 12:04:54,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:54,849 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2018-10-24 12:04:54,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:04:54,850 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2018-10-24 12:04:54,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:04:54,851 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:54,851 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:54,851 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:54,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:54,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1502974941, now seen corresponding path program 1 times [2018-10-24 12:04:54,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:54,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,853 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:54,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,854 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:54,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:54,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:54,951 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:54,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:04:54,952 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:54,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:04:54,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:04:54,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:04:54,953 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 6 states. [2018-10-24 12:04:55,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:55,085 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2018-10-24 12:04:55,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:04:55,086 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:04:55,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:55,088 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:04:55,088 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:04:55,090 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:04:55,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:04:55,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 12:04:55,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:04:55,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-24 12:04:55,096 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 20 [2018-10-24 12:04:55,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:55,096 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-24 12:04:55,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:04:55,097 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-24 12:04:55,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:04:55,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:55,098 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:55,098 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:55,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:55,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1442209030, now seen corresponding path program 1 times [2018-10-24 12:04:55,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:55,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:55,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,100 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:55,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:55,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:55,443 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:55,443 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:04:55,443 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:55,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:04:55,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:04:55,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:04:55,444 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 5 states. [2018-10-24 12:04:55,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:55,540 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2018-10-24 12:04:55,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:04:55,541 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-24 12:04:55,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:55,542 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:04:55,542 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:04:55,543 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:04:55,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:04:55,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:04:55,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:04:55,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-24 12:04:55,549 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 20 [2018-10-24 12:04:55,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:55,550 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-24 12:04:55,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:04:55,550 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-24 12:04:55,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:04:55,551 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:55,551 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:55,552 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:55,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:55,552 INFO L82 PathProgramCache]: Analyzing trace with hash -469535236, now seen corresponding path program 1 times [2018-10-24 12:04:55,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:55,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,553 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:55,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,554 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:55,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:55,696 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:55,696 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:55,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-24 12:04:55,697 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:55,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:04:55,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:04:55,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:04:55,698 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 4 states. [2018-10-24 12:04:55,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:55,971 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-10-24 12:04:55,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:04:55,972 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2018-10-24 12:04:55,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:55,973 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:04:55,973 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:04:55,975 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:04:55,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:04:55,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-24 12:04:55,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:04:55,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-24 12:04:55,982 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2018-10-24 12:04:55,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:55,983 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-24 12:04:55,983 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:04:55,983 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-24 12:04:55,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:04:55,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:55,984 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:55,985 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:55,985 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:55,985 INFO L82 PathProgramCache]: Analyzing trace with hash -862562246, now seen corresponding path program 1 times [2018-10-24 12:04:55,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:55,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:55,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:55,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:56,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:56,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:56,156 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:56,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-24 12:04:56,157 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:56,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:04:56,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:04:56,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:04:56,158 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 4 states. [2018-10-24 12:04:56,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:56,250 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2018-10-24 12:04:56,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:04:56,255 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2018-10-24 12:04:56,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:56,256 INFO L225 Difference]: With dead ends: 52 [2018-10-24 12:04:56,257 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:04:56,257 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:04:56,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:04:56,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2018-10-24 12:04:56,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 12:04:56,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-10-24 12:04:56,266 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 25 [2018-10-24 12:04:56,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:56,266 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-10-24 12:04:56,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:04:56,267 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-10-24 12:04:56,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:04:56,268 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:56,268 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:56,268 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:56,268 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:56,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1056341250, now seen corresponding path program 1 times [2018-10-24 12:04:56,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:56,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:56,270 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:56,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:56,270 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:56,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:56,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:56,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:56,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:04:56,762 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-24 12:04:56,765 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [8], [11], [17], [19], [24], [32], [33], [37], [39], [43], [46], [48], [54], [55], [56], [58], [59], [60] [2018-10-24 12:04:56,818 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:04:56,818 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:04:56,949 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:01,789 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:01,790 INFO L272 AbstractInterpreter]: Visited 22 different actions 337 times. Merged at 8 different actions 280 times. Widened at 1 different actions 31 times. Found 36 fixpoints after 2 different actions. Largest state had 29 variables. [2018-10-24 12:05:01,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:01,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:01,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:01,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:01,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:01,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:01,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:01,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:02,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:05:02,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:02,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:05:03,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:03,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 16 [2018-10-24 12:05:03,014 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:03,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:05:03,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:05:03,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:03,015 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 12 states. [2018-10-24 12:05:03,491 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 25 [2018-10-24 12:05:03,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:03,970 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2018-10-24 12:05:03,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:05:03,970 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-24 12:05:03,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:03,972 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:05:03,972 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:05:03,973 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=142, Invalid=458, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:05:03,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:05:03,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2018-10-24 12:05:03,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 12:05:03,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-24 12:05:03,982 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 25 [2018-10-24 12:05:03,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:03,982 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-24 12:05:03,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:05:03,982 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-24 12:05:03,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:05:03,983 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:03,984 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:03,984 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:03,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:03,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1449368260, now seen corresponding path program 1 times [2018-10-24 12:05:03,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:03,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:03,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,986 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:04,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:04,634 WARN L179 SmtUtils]: Spent 479.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 27 [2018-10-24 12:05:05,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:05,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:05,055 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-24 12:05:05,056 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [8], [11], [13], [17], [19], [24], [32], [33], [37], [39], [43], [46], [48], [54], [55], [56], [58], [59], [60] [2018-10-24 12:05:05,058 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:05:05,059 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:05:05,067 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:08,988 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:08,988 INFO L272 AbstractInterpreter]: Visited 23 different actions 404 times. Merged at 9 different actions 305 times. Widened at 1 different actions 32 times. Found 78 fixpoints after 5 different actions. Largest state had 29 variables. [2018-10-24 12:05:08,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:08,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:08,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:08,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:09,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:09,005 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:09,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:09,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:09,081 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:05:09,082 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:11,180 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 21 treesize of output 18 [2018-10-24 12:05:11,194 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 18 treesize of output 17 [2018-10-24 12:05:11,194 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:11,222 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:11,280 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:11,281 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-24 12:05:11,747 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2018-10-24 12:05:12,340 WARN L179 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 31 [2018-10-24 12:05:12,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:12,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:12,509 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 49 [2018-10-24 12:05:13,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:13,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:13,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 24 [2018-10-24 12:05:13,298 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:13,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:05:13,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:05:13,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:05:13,299 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2018-10-24 12:05:13,602 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 48 [2018-10-24 12:05:13,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:13,937 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-10-24 12:05:13,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:05:13,938 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 25 [2018-10-24 12:05:13,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:13,940 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:05:13,940 INFO L226 Difference]: Without dead ends: 35 [2018-10-24 12:05:13,941 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:05:13,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-24 12:05:13,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-10-24 12:05:13,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:05:13,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-10-24 12:05:13,948 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 25 [2018-10-24 12:05:13,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:13,948 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-10-24 12:05:13,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:05:13,948 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-10-24 12:05:13,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:05:13,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:13,949 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:13,950 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:13,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:13,950 INFO L82 PathProgramCache]: Analyzing trace with hash 890023736, now seen corresponding path program 1 times [2018-10-24 12:05:13,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:13,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:13,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:13,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:13,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:13,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:14,094 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:14,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:14,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:14,095 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-24 12:05:14,095 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [8], [11], [13], [17], [19], [22], [24], [32], [33], [37], [39], [43], [46], [48], [54], [55], [56], [58], [59], [60] [2018-10-24 12:05:14,101 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:05:14,101 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:05:14,108 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:18,404 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:18,405 INFO L272 AbstractInterpreter]: Visited 24 different actions 461 times. Merged at 10 different actions 318 times. Widened at 2 different actions 33 times. Found 106 fixpoints after 6 different actions. Largest state had 29 variables. [2018-10-24 12:05:18,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:18,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:18,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:18,447 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:18,462 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:18,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:18,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:18,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:18,550 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:18,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:18,614 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:18,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:18,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2018-10-24 12:05:18,636 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:18,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:05:18,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:05:18,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:05:18,637 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 7 states. [2018-10-24 12:05:18,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:18,714 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-24 12:05:18,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:05:18,715 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2018-10-24 12:05:18,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:18,716 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:05:18,716 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 12:05:18,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:05:18,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 12:05:18,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2018-10-24 12:05:18,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:05:18,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-10-24 12:05:18,724 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 30 [2018-10-24 12:05:18,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:18,724 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-10-24 12:05:18,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:05:18,725 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-10-24 12:05:18,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:05:18,725 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:18,726 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:18,726 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:18,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:18,726 INFO L82 PathProgramCache]: Analyzing trace with hash 303217722, now seen corresponding path program 2 times [2018-10-24 12:05:18,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:18,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:18,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:18,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:18,727 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:18,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:23,191 WARN L179 SmtUtils]: Spent 4.26 s on a formula simplification. DAG size of input: 102 DAG size of output: 30 [2018-10-24 12:05:24,433 WARN L179 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 52 [2018-10-24 12:05:24,752 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 51 [2018-10-24 12:05:27,158 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 46 [2018-10-24 12:05:27,172 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:27,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:27,174 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:27,174 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:27,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:27,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:27,175 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:27,194 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:27,194 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:27,300 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:05:27,300 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:27,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:27,322 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:05:27,323 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:27,430 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 21 treesize of output 18 [2018-10-24 12:05:27,433 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 18 treesize of output 17 [2018-10-24 12:05:27,433 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:27,436 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:27,443 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:27,443 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-24 12:05:32,423 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:32,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:32,626 WARN L179 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 54 [2018-10-24 12:05:32,874 WARN L179 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2018-10-24 12:05:33,573 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2018-10-24 12:05:34,188 WARN L179 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2018-10-24 12:05:34,494 WARN L179 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2018-10-24 12:05:34,725 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-24 12:05:34,748 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:34,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:34,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2018-10-24 12:05:34,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:34,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:05:34,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:05:34,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=912, Unknown=3, NotChecked=0, Total=1056 [2018-10-24 12:05:34,772 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 23 states. [2018-10-24 12:05:37,189 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 45 [2018-10-24 12:05:40,887 WARN L179 SmtUtils]: Spent 2.82 s on a formula simplification. DAG size of input: 83 DAG size of output: 35 [2018-10-24 12:05:40,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:40,946 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2018-10-24 12:05:40,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:05:40,947 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2018-10-24 12:05:40,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:40,948 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:05:40,948 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:05:40,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=229, Invalid=1173, Unknown=4, NotChecked=0, Total=1406 [2018-10-24 12:05:40,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:05:40,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-24 12:05:40,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:05:40,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-24 12:05:40,956 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 30 [2018-10-24 12:05:40,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:40,957 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-24 12:05:40,957 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:05:40,957 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-24 12:05:40,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:05:40,958 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:40,958 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:40,958 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:40,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:40,958 INFO L82 PathProgramCache]: Analyzing trace with hash 411764474, now seen corresponding path program 2 times [2018-10-24 12:05:40,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:40,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:40,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:40,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:40,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:41,235 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:41,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:41,235 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:41,235 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:41,235 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:41,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:41,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:41,243 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:41,243 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:41,356 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:05:41,356 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:41,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:41,402 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:41,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:41,470 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:41,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:41,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-24 12:05:41,494 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:41,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:05:41,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:05:41,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:05:41,495 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 9 states. [2018-10-24 12:05:41,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:41,633 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-10-24 12:05:41,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:05:41,634 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-10-24 12:05:41,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:41,636 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:05:41,636 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:05:41,636 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:05:41,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:05:41,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 41. [2018-10-24 12:05:41,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:05:41,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2018-10-24 12:05:41,643 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 35 [2018-10-24 12:05:41,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:41,644 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2018-10-24 12:05:41,644 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:05:41,644 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2018-10-24 12:05:41,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:05:41,645 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:41,645 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:41,645 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:41,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:41,645 INFO L82 PathProgramCache]: Analyzing trace with hash -175041540, now seen corresponding path program 3 times [2018-10-24 12:05:41,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:41,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:41,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:41,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:41,646 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:42,822 WARN L179 SmtUtils]: Spent 894.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 29 [2018-10-24 12:05:43,240 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 36 [2018-10-24 12:05:45,148 WARN L179 SmtUtils]: Spent 1.88 s on a formula simplification. DAG size of input: 116 DAG size of output: 56 [2018-10-24 12:05:47,358 WARN L179 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 101 DAG size of output: 53 [2018-10-24 12:05:47,601 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 58 [2018-10-24 12:05:47,887 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 51 [2018-10-24 12:05:48,088 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 45 [2018-10-24 12:05:48,396 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 45 [2018-10-24 12:05:48,664 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 36 [2018-10-24 12:05:48,937 WARN L179 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 31 [2018-10-24 12:05:48,947 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:48,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:48,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:48,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:48,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:48,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:48,948 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:48,958 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:48,959 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:49,062 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:49,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:49,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:49,078 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 30 treesize of output 27 [2018-10-24 12:05:49,082 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 18 treesize of output 17 [2018-10-24 12:05:49,083 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:49,095 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:49,100 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 31 treesize of output 28 [2018-10-24 12:05:49,102 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 18 treesize of output 17 [2018-10-24 12:05:49,103 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:05:49,114 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:51,147 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:05:51,147 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-24 12:05:51,835 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 41 [2018-10-24 12:05:52,384 WARN L179 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 44 [2018-10-24 12:05:52,856 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:52,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:53,354 WARN L179 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 71 [2018-10-24 12:05:54,104 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 39 [2018-10-24 12:05:55,072 WARN L179 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 45 [2018-10-24 12:05:55,362 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2018-10-24 12:05:55,718 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-24 12:05:56,310 WARN L179 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 57 [2018-10-24 12:05:56,692 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2018-10-24 12:05:59,129 WARN L179 SmtUtils]: Spent 2.28 s on a formula simplification that was a NOOP. DAG size: 60 [2018-10-24 12:05:59,904 WARN L179 SmtUtils]: Spent 373.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2018-10-24 12:05:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:59,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:59,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 47 [2018-10-24 12:05:59,950 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:59,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:05:59,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:05:59,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1923, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:05:59,952 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 32 states. [2018-10-24 12:06:02,444 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 45 [2018-10-24 12:06:03,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:03,400 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-10-24 12:06:03,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:06:03,403 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 35 [2018-10-24 12:06:03,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:03,404 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:06:03,405 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:06:03,406 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=364, Invalid=2498, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:06:03,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:06:03,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:06:03,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:06:03,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2018-10-24 12:06:03,414 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 35 [2018-10-24 12:06:03,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:03,414 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2018-10-24 12:06:03,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:06:03,414 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2018-10-24 12:06:03,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:06:03,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:03,415 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:03,416 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:03,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:03,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1953970296, now seen corresponding path program 3 times [2018-10-24 12:06:03,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:03,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:03,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:03,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:03,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:03,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:03,862 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 16 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:03,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:03,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:03,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:03,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:03,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:03,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:03,872 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:06:03,872 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:06:03,910 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:06:03,910 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:06:03,913 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:04,381 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 16 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:04,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:04,482 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 16 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:04,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:04,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2018-10-24 12:06:04,505 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:04,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:06:04,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:06:04,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:06:04,506 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 11 states. [2018-10-24 12:06:04,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:04,784 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-10-24 12:06:04,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:06:04,785 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2018-10-24 12:06:04,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:04,786 INFO L225 Difference]: With dead ends: 67 [2018-10-24 12:06:04,786 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:06:04,787 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:06:04,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:06:04,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2018-10-24 12:06:04,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:06:04,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-24 12:06:04,794 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2018-10-24 12:06:04,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:04,795 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-24 12:06:04,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:06:04,795 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-24 12:06:04,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:06:04,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:04,796 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:04,796 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:04,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:04,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1367164282, now seen corresponding path program 4 times [2018-10-24 12:06:04,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:04,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:04,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:04,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:04,798 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:04,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:07,158 WARN L179 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 111 DAG size of output: 24 [2018-10-24 12:06:07,562 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 31 [2018-10-24 12:06:07,795 WARN L179 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 47 [2018-10-24 12:06:08,077 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 55 [2018-10-24 12:06:08,268 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 63 [2018-10-24 12:06:08,428 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 54 [2018-10-24 12:06:08,681 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 46 [2018-10-24 12:06:11,001 WARN L854 $PredicateComparison]: unable to prove that (or (let ((.cse13 (div c_~SIZE~0 4294967296))) (let ((.cse9 (* 4294967296 .cse13))) (and (let ((.cse11 (* 2 (div c_~SIZE~0 2)))) (let ((.cse4 (= .cse11 c_~SIZE~0)) (.cse6 (<= .cse9 c_~SIZE~0)) (.cse10 (div (+ c_~SIZE~0 (* (- 4294967296) .cse13)) 2))) (let ((.cse0 (div .cse10 4294967296)) (.cse1 (or .cse4 .cse6)) (.cse12 (not (= c_~SIZE~0 (+ |c_linear_search_#in~n| .cse9)))) (.cse5 (div (+ .cse10 1) 4294967296)) (.cse2 (not .cse4)) (.cse3 (< c_~SIZE~0 .cse9))) (or (and (<= (+ .cse0 1) 0) .cse1) (let ((.cse8 (* 8589934592 .cse13))) (and (or (and (or (and .cse2 .cse3) (< 0 .cse0)) (or .cse4 (< 0 .cse5) .cse6)) (and (let ((.cse7 (<= (+ c_~SIZE~0 1) .cse9))) (or .cse7 (and (or (not (= (select (select |c_#memory_int| |c_linear_search_#in~a.base|) (- (+ .cse8 (* (- 2) c_~SIZE~0)))) |c_linear_search_#in~q|)) (< (+ .cse9 (* 2 .cse10)) c_~SIZE~0)) (or (<= c_~SIZE~0 .cse11) (<= (+ .cse9 4294967300) c_~SIZE~0) (<= (+ .cse11 2) c_~SIZE~0) .cse7 .cse12)))) (not (= c_~SIZE~0 (+ |c_linear_search_#in~n| .cse9 4294967296))))) (or (<= (* 2 c_~SIZE~0) (+ .cse8 8)) (and (<= .cse0 0) .cse1) (and .cse2 (<= .cse5 0) .cse3)))) .cse12 (and (<= (+ .cse5 1) 0) .cse2 .cse3))))) (<= c_~SIZE~0 (+ .cse9 4))))) (not (= 0 |c_linear_search_#in~a.offset|))) is different from true [2018-10-24 12:06:11,018 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:11,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:11,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:11,019 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:11,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:11,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:11,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:11,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:06:11,029 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:06:11,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:11,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:11,128 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:06:11,129 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 12:06:11,152 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 21 treesize of output 18 [2018-10-24 12:06:11,160 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 18 treesize of output 17 [2018-10-24 12:06:11,161 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:06:11,163 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:06:11,168 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:06:11,169 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-24 12:06:12,084 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 60 [2018-10-24 12:06:12,793 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 64 [2018-10-24 12:06:21,604 WARN L179 SmtUtils]: Spent 7.68 s on a formula simplification. DAG size of input: 57 DAG size of output: 51 [2018-10-24 12:06:26,821 WARN L179 SmtUtils]: Spent 4.30 s on a formula simplification. DAG size of input: 54 DAG size of output: 40 [2018-10-24 12:06:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:26,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:27,439 WARN L179 SmtUtils]: Spent 449.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 97 [2018-10-24 12:06:29,354 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-24 12:06:29,770 WARN L179 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 54 [2018-10-24 12:06:30,110 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2018-10-24 12:06:30,701 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-24 12:06:31,200 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-10-24 12:06:31,979 WARN L179 SmtUtils]: Spent 445.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-10-24 12:06:34,849 WARN L179 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2018-10-24 12:06:35,931 WARN L179 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 86 [2018-10-24 12:06:36,118 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:06:36,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:36,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 20] total 51 [2018-10-24 12:06:36,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:36,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:06:36,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:06:36,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=2224, Unknown=4, NotChecked=96, Total=2550 [2018-10-24 12:06:36,159 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 33 states. [2018-10-24 12:06:36,809 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 49 [2018-10-24 12:06:37,085 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 54 [2018-10-24 12:06:38,036 WARN L179 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 63 [2018-10-24 12:06:38,905 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 67 [2018-10-24 12:06:39,474 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 73 [2018-10-24 12:06:40,149 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 63 [2018-10-24 12:06:41,319 WARN L179 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 71 [2018-10-24 12:06:41,739 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 64 [2018-10-24 12:06:49,864 WARN L179 SmtUtils]: Spent 8.01 s on a formula simplification. DAG size of input: 86 DAG size of output: 61 [2018-10-24 12:07:00,286 WARN L179 SmtUtils]: Spent 8.22 s on a formula simplification. DAG size of input: 118 DAG size of output: 79 [2018-10-24 12:07:03,747 WARN L179 SmtUtils]: Spent 3.29 s on a formula simplification. DAG size of input: 147 DAG size of output: 83 [2018-10-24 12:07:12,122 WARN L179 SmtUtils]: Spent 7.95 s on a formula simplification. DAG size of input: 118 DAG size of output: 79 [2018-10-24 12:07:25,946 WARN L179 SmtUtils]: Spent 13.66 s on a formula simplification. DAG size of input: 191 DAG size of output: 81 [2018-10-24 12:07:26,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:26,548 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-10-24 12:07:26,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:07:26,550 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2018-10-24 12:07:26,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:26,551 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:07:26,552 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 12:07:26,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 42 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 78.4s TimeCoverageRelationStatistics Valid=442, Invalid=3848, Unknown=4, NotChecked=128, Total=4422 [2018-10-24 12:07:26,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 12:07:26,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2018-10-24 12:07:26,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-24 12:07:26,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-24 12:07:26,567 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 40 [2018-10-24 12:07:26,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:26,567 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-24 12:07:26,567 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:07:26,567 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-24 12:07:26,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:07:26,569 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:26,570 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:26,570 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:26,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:26,570 INFO L82 PathProgramCache]: Analyzing trace with hash 545539514, now seen corresponding path program 4 times [2018-10-24 12:07:26,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:26,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:26,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:26,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:26,572 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:26,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:26,884 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 9 [2018-10-24 12:07:29,382 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 20 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:07:29,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:29,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:29,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:29,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:29,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:29,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:29,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:29,392 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:07:29,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:29,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:29,553 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 20 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:07:29,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:07:29,739 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 20 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:07:29,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:07:29,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2018-10-24 12:07:29,763 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:07:29,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:07:29,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:07:29,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=235, Unknown=1, NotChecked=0, Total=342 [2018-10-24 12:07:29,765 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 13 states. [2018-10-24 12:07:30,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:30,002 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-10-24 12:07:30,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:07:30,002 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2018-10-24 12:07:30,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:30,003 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:07:30,003 INFO L226 Difference]: Without dead ends: 59 [2018-10-24 12:07:30,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=106, Invalid=235, Unknown=1, NotChecked=0, Total=342 [2018-10-24 12:07:30,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-24 12:07:30,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2018-10-24 12:07:30,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:07:30,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-10-24 12:07:30,014 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 45 [2018-10-24 12:07:30,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:30,015 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-10-24 12:07:30,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:07:30,015 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-10-24 12:07:30,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:07:30,016 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:30,016 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:30,017 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:30,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:30,017 INFO L82 PathProgramCache]: Analyzing trace with hash -41266500, now seen corresponding path program 5 times [2018-10-24 12:07:30,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:30,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:30,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:30,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:30,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:30,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:30,347 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 28 [2018-10-24 12:07:31,008 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2018-10-24 12:07:31,880 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 46 [2018-10-24 12:07:31,898 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:07:31,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:31,898 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:31,898 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:31,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:31,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:31,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:31,911 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:07:31,911 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:07:51,578 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:07:51,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:07:51,605 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:51,618 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:07:51,618 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 12:07:51,620 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:07:51,620 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:07:51,621 WARN L307 Elim1Store]: Array PQE input equivalent to false [2018-10-24 12:07:51,621 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:07:53,712 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 39 treesize of output 36 [2018-10-24 12:07:53,715 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 18 treesize of output 17 [2018-10-24 12:07:53,716 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2018-10-24 12:07:55,743 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:07:55,748 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 34 treesize of output 31 [2018-10-24 12:07:55,751 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 18 treesize of output 17 [2018-10-24 12:07:55,752 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 1 xjuncts. [2018-10-24 12:07:55,761 INFO L267 ElimStorePlain]: Start of recursive call 7: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:07:55,791 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2018-10-24 12:07:55,791 INFO L202 ElimStorePlain]: Needed 8 recursive calls to eliminate 5 variables, input treesize:445, output treesize:66 [2018-10-24 12:07:56,561 WARN L179 SmtUtils]: Spent 552.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2018-10-24 12:07:57,534 WARN L179 SmtUtils]: Spent 744.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2018-10-24 12:07:58,638 WARN L179 SmtUtils]: Spent 870.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2018-10-24 12:07:59,342 WARN L179 SmtUtils]: Spent 646.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2018-10-24 12:08:00,902 WARN L179 SmtUtils]: Spent 1.34 s on a formula simplification that was a NOOP. DAG size: 66 [2018-10-24 12:08:05,703 WARN L179 SmtUtils]: Spent 4.11 s on a formula simplification. DAG size of input: 71 DAG size of output: 71 [2018-10-24 12:08:06,422 WARN L179 SmtUtils]: Spent 566.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-10-24 12:08:07,584 WARN L179 SmtUtils]: Spent 929.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 59 [2018-10-24 12:08:07,856 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2018-10-24 12:08:08,426 WARN L179 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2018-10-24 12:08:10,348 WARN L179 SmtUtils]: Spent 1.53 s on a formula simplification. DAG size of input: 60 DAG size of output: 60 [2018-10-24 12:08:10,708 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:10,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:08:12,020 WARN L179 SmtUtils]: Spent 1.31 s on a formula simplification. DAG size of input: 161 DAG size of output: 118 [2018-10-24 12:08:12,215 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 72 [2018-10-24 12:08:13,282 WARN L179 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 55 [2018-10-24 12:08:13,537 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2018-10-24 12:08:13,815 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2018-10-24 12:08:14,414 WARN L179 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 70 [2018-10-24 12:08:14,837 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2018-10-24 12:08:15,429 WARN L179 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2018-10-24 12:08:15,909 WARN L179 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-10-24 12:08:16,681 WARN L179 SmtUtils]: Spent 439.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 73 [2018-10-24 12:08:17,320 WARN L179 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-10-24 12:08:18,281 WARN L179 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-10-24 12:08:19,108 WARN L179 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2018-10-24 12:08:20,248 WARN L179 SmtUtils]: Spent 634.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2018-10-24 12:08:22,503 WARN L179 SmtUtils]: Spent 1.42 s on a formula simplification. DAG size of input: 86 DAG size of output: 86 [2018-10-24 12:08:23,983 WARN L179 SmtUtils]: Spent 587.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2018-10-24 12:08:26,387 WARN L179 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 91 [2018-10-24 12:08:30,708 WARN L179 SmtUtils]: Spent 2.70 s on a formula simplification. DAG size of input: 95 DAG size of output: 95 [2018-10-24 12:08:33,057 WARN L179 SmtUtils]: Spent 1.44 s on a formula simplification. DAG size of input: 95 DAG size of output: 92 [2018-10-24 12:08:33,206 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:33,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:08:33,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21, 23] total 56 [2018-10-24 12:08:33,246 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:08:33,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:08:33,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:08:33,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=2784, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:08:33,251 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 35 states. [2018-10-24 12:08:35,165 WARN L179 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 73 [2018-10-24 12:08:36,343 WARN L179 SmtUtils]: Spent 751.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2018-10-24 12:08:37,830 WARN L179 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 65 DAG size of output: 60 [2018-10-24 12:08:39,520 WARN L179 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2018-10-24 12:08:39,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:08:39,749 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2018-10-24 12:08:39,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:08:39,749 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 45 [2018-10-24 12:08:39,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:08:39,751 INFO L225 Difference]: With dead ends: 65 [2018-10-24 12:08:39,751 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:08:39,753 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 47 SyntacticMatches, 7 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 41.7s TimeCoverageRelationStatistics Valid=416, Invalid=3244, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:08:39,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:08:39,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-24 12:08:39,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:08:39,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-10-24 12:08:39,761 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 45 [2018-10-24 12:08:39,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:08:39,762 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-10-24 12:08:39,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:08:39,762 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-10-24 12:08:39,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:08:39,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:08:39,763 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:08:39,763 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:08:39,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:08:39,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1808322120, now seen corresponding path program 5 times [2018-10-24 12:08:39,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:08:39,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:39,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:08:39,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:39,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:08:39,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:08:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 24 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:46,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:46,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:08:46,990 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:08:46,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:08:46,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:46,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:08:46,998 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:08:46,998 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:08:47,847 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:08:47,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:08:47,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:08:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 24 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:47,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:08:48,356 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 24 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:48,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:08:48,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2018-10-24 12:08:48,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:08:48,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:08:48,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:08:48,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=321, Unknown=3, NotChecked=0, Total=462 [2018-10-24 12:08:48,379 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 15 states. [2018-10-24 12:08:48,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:08:48,704 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-24 12:08:48,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:08:48,705 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 50 [2018-10-24 12:08:48,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:08:48,706 INFO L225 Difference]: With dead ends: 77 [2018-10-24 12:08:48,706 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:08:48,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=138, Invalid=321, Unknown=3, NotChecked=0, Total=462 [2018-10-24 12:08:48,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:08:48,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2018-10-24 12:08:48,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:08:48,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2018-10-24 12:08:48,716 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 50 [2018-10-24 12:08:48,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:08:48,716 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2018-10-24 12:08:48,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:08:48,717 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2018-10-24 12:08:48,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:08:48,717 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:08:48,717 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:08:48,718 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:08:48,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:08:48,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1899839162, now seen corresponding path program 6 times [2018-10-24 12:08:48,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:08:48,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:48,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:08:48,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:48,719 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:08:48,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:08:51,066 WARN L179 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 120 DAG size of output: 26 [2018-10-24 12:08:52,008 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 44 [2018-10-24 12:08:52,209 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 52 [2018-10-24 12:08:52,377 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 43 [2018-10-24 12:08:52,658 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 38 [2018-10-24 12:08:53,069 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 35 [2018-10-24 12:08:53,088 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:53,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:53,088 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:08:53,088 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:08:53,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:08:53,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:53,089 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:08:53,097 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:08:53,098 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:08:53,240 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:08:53,241 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:08:53,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:08:53,251 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 30 treesize of output 27 [2018-10-24 12:08:53,253 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 18 treesize of output 17 [2018-10-24 12:08:53,253 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:08:53,263 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:08:53,271 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 31 treesize of output 28 [2018-10-24 12:08:53,276 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 18 treesize of output 17 [2018-10-24 12:08:53,277 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:08:53,361 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:08:55,459 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:08:55,459 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:100, output treesize:21 [2018-10-24 12:08:56,848 WARN L179 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 62 [2018-10-24 12:08:58,948 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:08:58,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:01,392 WARN L179 SmtUtils]: Spent 2.44 s on a formula simplification. DAG size of input: 150 DAG size of output: 115 [2018-10-24 12:09:01,604 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-24 12:09:03,398 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2018-10-24 12:09:04,013 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2018-10-24 12:09:04,399 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2018-10-24 12:09:05,047 WARN L179 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 87 [2018-10-24 12:09:05,775 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-10-24 12:09:06,610 WARN L179 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-10-24 12:09:07,515 WARN L179 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 96 Received shutdown request... [2018-10-24 12:09:08,831 WARN L187 SmtUtils]: Removed 10 from assertion stack [2018-10-24 12:09:08,831 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:09:09,032 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:09,033 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:09:09,038 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:09:09,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:09:09 BoogieIcfgContainer [2018-10-24 12:09:09,039 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:09:09,040 INFO L168 Benchmark]: Toolchain (without parser) took 256739.17 ms. Allocated memory was 1.5 GB in the beginning and 3.6 GB in the end (delta: 2.1 GB). Free memory was 1.4 GB in the beginning and 2.8 GB in the end (delta: -1.4 GB). Peak memory consumption was 721.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:09:09,040 INFO L168 Benchmark]: CDTParser took 0.25 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. [2018-10-24 12:09:09,040 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.90 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:09:09,041 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.71 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:09:09,041 INFO L168 Benchmark]: Boogie Preprocessor took 38.40 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:09:09,041 INFO L168 Benchmark]: RCFGBuilder took 559.62 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 757.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -790.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:09:09,042 INFO L168 Benchmark]: TraceAbstraction took 255809.07 ms. Allocated memory was 2.3 GB in the beginning and 3.6 GB in the end (delta: 1.3 GB). Free memory was 2.2 GB in the beginning and 2.8 GB in the end (delta: -573.5 MB). Peak memory consumption was 744.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:09:09,044 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 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 286.90 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 40.71 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 38.40 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 559.62 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 757.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -790.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 255809.07 ms. Allocated memory was 2.3 GB in the beginning and 3.6 GB in the end (delta: 1.3 GB). Free memory was 2.2 GB in the beginning and 2.8 GB in the end (delta: -573.5 MB). Peak memory consumption was 744.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 51 with TraceHistMax 7,while TraceCheckSpWp was constructing backward predicates,while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 98. - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 29 locations, 1 error locations. TIMEOUT Result, 255.7s OverallTime, 18 OverallIterations, 7 TraceHistogramMax, 70.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 366 SDtfs, 400 SDslu, 2150 SDs, 0 SdLazy, 2981 SolverSat, 125 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 8.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1000 GetRequests, 616 SyntacticMatches, 34 SemanticMatches, 350 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3315 ImplicationChecksByTransitivity, 174.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 13.3s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 17 MinimizatonAttempts, 72 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 21.5s SatisfiabilityAnalysisTime, 129.1s InterpolantComputationTime, 927 NumberOfCodeBlocks, 927 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 1288 ConstructedInterpolants, 132 QuantifiedInterpolants, 1876742 SizeOfPredicates, 141 NumberOfNonLiveVariables, 1829 ConjunctsInSsa, 406 ConjunctsInUnsatCore, 39 InterpolantComputations, 6 PerfectInterpolantSequences, 252/1265 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown