java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:18:10,565 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:18:10,568 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:18:10,584 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:18:10,585 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:18:10,586 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:18:10,588 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:18:10,590 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:18:10,594 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:18:10,595 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:18:10,596 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:18:10,596 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:18:10,599 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:18:10,605 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:18:10,606 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:18:10,607 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:18:10,612 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:18:10,614 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:18:10,618 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:18:10,619 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:18:10,622 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:18:10,623 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:18:10,625 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:18:10,625 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:18:10,625 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:18:10,628 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:18:10,629 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:18:10,630 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:18:10,631 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:18:10,631 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:18:10,632 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:18:10,632 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:18:10,632 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:18:10,633 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:18:10,633 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:18:10,634 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:18:10,634 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 12:18:10,661 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:18:10,662 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:18:10,662 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:18:10,663 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:18:10,663 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:18:10,663 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:18:10,663 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:18:10,663 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:18:10,664 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:18:10,664 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:18:10,665 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:18:10,665 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:18:10,666 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:18:10,666 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:18:10,666 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:18:10,666 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:18:10,666 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:18:10,667 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:18:10,668 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:18:10,668 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:18:10,669 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:18:10,669 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:18:10,669 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:18:10,669 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:18:10,669 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:18:10,670 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:18:10,670 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:18:10,670 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:18:10,671 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:18:10,671 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:18:10,671 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:18:10,671 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:18:10,671 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:18:10,672 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:18:10,733 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:18:10,747 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:18:10,751 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:18:10,752 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:18:10,753 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:18:10,754 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:18:10,822 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/25b13f51f/8740ed25befd47d28c301513c61a56f6/FLAG4afca66f6 [2018-10-24 12:18:11,228 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:18:11,228 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:18:11,235 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/25b13f51f/8740ed25befd47d28c301513c61a56f6/FLAG4afca66f6 [2018-10-24 12:18:11,255 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/25b13f51f/8740ed25befd47d28c301513c61a56f6 [2018-10-24 12:18:11,269 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:18:11,272 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:18:11,274 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:18:11,274 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:18:11,279 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:18:11,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,283 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ad33cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11, skipping insertion in model container [2018-10-24 12:18:11,283 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,294 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:18:11,316 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:18:11,500 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:18:11,503 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:18:11,517 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:18:11,530 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:18:11,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11 WrapperNode [2018-10-24 12:18:11,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:18:11,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:18:11,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:18:11,532 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:18:11,539 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,544 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,548 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:18:11,549 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:18:11,549 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:18:11,549 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:18:11,556 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,557 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,557 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,566 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (1/1) ... [2018-10-24 12:18:11,567 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:18:11,568 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:18:11,568 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:18:11,568 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:18:11,569 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (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 12:18:11,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:18:11,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:18:11,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:18:11,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:18:11,627 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:18:11,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:18:11,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:18:11,628 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:18:11,888 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:18:11,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:18:11 BoogieIcfgContainer [2018-10-24 12:18:11,892 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:18:11,893 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:18:11,893 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:18:11,902 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:18:11,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:18:11" (1/3) ... [2018-10-24 12:18:11,908 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@761115bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:18:11, skipping insertion in model container [2018-10-24 12:18:11,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:11" (2/3) ... [2018-10-24 12:18:11,909 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@761115bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:18:11, skipping insertion in model container [2018-10-24 12:18:11,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:18:11" (3/3) ... [2018-10-24 12:18:11,914 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:18:11,940 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:18:11,961 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:18:11,982 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:18:12,026 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:18:12,027 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:18:12,027 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:18:12,027 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:18:12,027 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:18:12,027 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:18:12,027 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:18:12,028 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:18:12,054 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-24 12:18:12,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:18:12,061 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,062 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,064 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-10-24 12:18:12,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:12,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,178 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 12:18:12,180 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:18:12,181 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:18:12,181 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:18:12,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:18:12,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:18:12,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:18:12,199 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-24 12:18:12,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:12,223 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-24 12:18:12,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:18:12,225 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-24 12:18:12,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:12,234 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:18:12,235 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 12:18:12,238 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 12:18:12,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 12:18:12,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 12:18:12,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 12:18:12,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 12:18:12,278 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 12:18:12,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:12,279 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 12:18:12,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:18:12,279 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 12:18:12,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-24 12:18:12,280 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,280 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,281 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-10-24 12:18:12,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,283 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:12,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,283 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,477 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 5 [2018-10-24 12:18:12,643 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 12:18:12,643 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:18:12,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:18:12,644 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:18:12,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:18:12,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:18:12,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:18:12,649 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 12:18:12,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:12,779 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:18:12,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:18:12,779 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-10-24 12:18:12,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:12,781 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:18:12,782 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:18:12,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:18:12,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:18:12,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:18:12,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:18:12,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 12:18:12,789 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-10-24 12:18:12,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:12,790 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 12:18:12,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:18:12,790 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 12:18:12,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:18:12,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,791 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,791 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-10-24 12:18:12,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,793 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:12,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:12,898 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:12,901 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-24 12:18:12,903 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:18:12,954 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:18:12,954 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:18:13,272 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:18:13,273 INFO L272 AbstractInterpreter]: Visited 14 different actions 102 times. Merged at 4 different actions 44 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:18:13,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:13,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:18:13,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,285 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 12:18:13,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:13,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:13,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:13,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:13,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:13,745 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:13,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:18:13,767 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:13,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:18:13,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:18:13,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:18:13,772 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 12:18:13,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:13,937 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-24 12:18:13,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:18:13,937 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 12:18:13,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:13,938 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:18:13,938 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:18:13,939 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:18:13,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:18:13,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-24 12:18:13,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:18:13,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-24 12:18:13,945 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-10-24 12:18:13,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:13,945 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-24 12:18:13,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:18:13,946 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-24 12:18:13,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:18:13,946 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:13,947 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:13,947 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:13,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:13,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-10-24 12:18:13,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:13,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:13,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:13,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:14,201 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:14,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:14,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:14,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:14,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:14,202 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 12:18:14,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:14,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:14,263 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:18:14,264 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:14,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:14,453 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:14,756 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:14,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:18:14,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:14,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:18:14,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:18:14,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:18:14,792 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-10-24 12:18:15,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:15,271 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-24 12:18:15,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:18:15,273 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-24 12:18:15,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:15,274 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:18:15,274 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:18:15,275 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:18:15,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:18:15,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 12:18:15,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:18:15,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 12:18:15,282 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-10-24 12:18:15,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:15,282 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 12:18:15,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:18:15,283 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 12:18:15,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:18:15,284 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:15,284 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:15,284 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:15,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:15,284 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-10-24 12:18:15,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:15,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:15,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,286 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:15,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:15,475 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,475 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:15,475 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:15,476 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:15,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,476 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 12:18:15,487 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:15,487 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:15,499 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:15,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:15,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:15,646 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:15,969 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:15,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:18:15,990 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:15,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:18:15,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:18:15,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:18:15,991 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-10-24 12:18:16,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:16,331 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-10-24 12:18:16,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:18:16,338 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-24 12:18:16,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:16,339 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:18:16,340 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:18:16,343 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:18:16,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:18:16,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-24 12:18:16,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:18:16,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-24 12:18:16,353 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-10-24 12:18:16,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:16,353 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-24 12:18:16,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:18:16,355 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-24 12:18:16,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:18:16,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:16,359 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:16,359 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:16,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:16,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-10-24 12:18:16,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:16,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:16,363 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:16,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:16,363 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:16,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:16,671 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,672 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:16,672 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:16,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:16,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,673 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 12:18:16,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:16,689 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:16,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:16,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:17,535 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:17,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:17,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:18:17,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:17,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:18:17,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:18:17,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:18:17,558 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-10-24 12:18:18,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:18,064 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-24 12:18:18,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:18:18,065 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-24 12:18:18,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:18,066 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:18:18,066 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:18:18,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:18,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:18:18,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 12:18:18,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:18:18,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-24 12:18:18,075 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-10-24 12:18:18,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:18,076 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-24 12:18:18,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:18:18,076 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-24 12:18:18,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:18:18,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:18,078 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:18,078 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:18,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:18,079 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-10-24 12:18:18,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:18,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:18,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:18,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:18,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:18,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:19,148 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,149 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:19,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:19,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:19,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,149 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 12:18:19,158 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:19,158 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:19,178 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:18:19,178 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:19,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:19,831 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:19,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:18:19,853 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:19,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:18:19,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:18:19,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:18:19,855 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-10-24 12:18:20,676 WARN L179 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 11 [2018-10-24 12:18:20,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:20,962 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-10-24 12:18:20,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:18:20,964 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-10-24 12:18:20,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:20,966 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:18:20,966 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:18:20,968 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:18:20,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:18:20,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-24 12:18:20,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:18:20,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-24 12:18:20,976 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-10-24 12:18:20,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:20,976 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-24 12:18:20,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:18:20,977 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-24 12:18:20,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:18:20,978 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:20,978 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:20,979 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:20,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:20,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-10-24 12:18:20,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:20,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:20,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,981 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:21,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:21,518 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:21,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:21,519 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:21,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:21,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,519 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 12:18:21,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:21,533 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:21,563 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:21,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:21,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:21,756 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:21,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:23,251 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:23,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:23,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:18:23,289 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:23,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:18:23,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:18:23,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:23,291 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-10-24 12:18:24,039 WARN L179 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 8 [2018-10-24 12:18:24,450 WARN L179 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 8 [2018-10-24 12:18:25,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:25,311 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-10-24 12:18:25,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:18:25,312 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-10-24 12:18:25,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:25,314 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:18:25,314 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:18:25,315 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:18:25,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:18:25,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-24 12:18:25,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-24 12:18:25,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-24 12:18:25,324 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-10-24 12:18:25,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:25,325 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-24 12:18:25,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:18:25,325 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-24 12:18:25,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:18:25,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:25,326 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:25,326 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:25,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:25,327 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-10-24 12:18:25,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:25,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:25,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:25,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:26,037 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:26,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:26,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:26,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,038 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 12:18:26,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:26,046 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:26,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:26,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:26,215 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:27,668 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:27,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:27,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:18:27,695 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:27,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:18:27,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:18:27,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:18:27,698 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-10-24 12:18:28,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:28,802 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-10-24 12:18:28,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:18:28,803 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-24 12:18:28,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:28,804 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:18:28,805 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:18:28,806 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:18:28,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:18:28,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-24 12:18:28,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:18:28,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-10-24 12:18:28,816 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-10-24 12:18:28,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:28,816 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-10-24 12:18:28,817 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:18:28,817 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-10-24 12:18:28,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-24 12:18:28,818 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:28,818 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:28,818 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:28,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:28,819 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-10-24 12:18:28,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:28,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:28,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,820 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:28,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:29,351 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:29,351 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:29,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:29,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,352 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 12:18:29,360 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:29,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:29,401 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:18:29,401 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:29,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:29,516 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:30,379 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:30,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:30,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:18:30,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:30,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:18:30,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:18:30,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:18:30,404 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-10-24 12:18:31,262 WARN L179 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-10-24 12:18:32,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:32,095 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-10-24 12:18:32,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:18:32,100 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-10-24 12:18:32,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:32,101 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:18:32,101 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:18:32,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:18:32,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:18:32,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-24 12:18:32,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-24 12:18:32,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-10-24 12:18:32,120 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-10-24 12:18:32,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:32,121 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-10-24 12:18:32,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:18:32,121 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-10-24 12:18:32,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-24 12:18:32,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:32,123 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:32,123 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:32,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:32,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-10-24 12:18:32,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:32,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:32,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:32,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:32,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:32,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:33,400 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:33,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:33,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:33,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:33,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:33,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:33,401 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 12:18:33,409 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:33,409 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:33,438 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:33,438 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:33,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:33,558 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:33,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:34,706 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:34,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:34,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:18:34,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:34,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:18:34,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:18:34,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:18:34,730 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-10-24 12:18:35,526 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-10-24 12:18:36,157 WARN L179 SmtUtils]: Spent 372.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 11 [2018-10-24 12:18:36,684 WARN L179 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 11 [2018-10-24 12:18:37,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:37,804 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-10-24 12:18:37,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:18:37,809 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-10-24 12:18:37,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:37,810 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:18:37,810 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:18:37,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:18:37,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:18:37,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-24 12:18:37,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:18:37,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-10-24 12:18:37,821 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-10-24 12:18:37,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:37,822 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-10-24 12:18:37,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:18:37,822 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-10-24 12:18:37,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:18:37,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:37,824 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:37,824 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:37,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:37,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-10-24 12:18:37,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:37,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:37,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:37,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:37,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:37,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:38,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:38,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:38,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:38,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:38,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:38,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:38,506 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 12:18:38,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:38,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:38,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:38,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:38,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:38,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:40,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:40,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:40,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:18:40,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:40,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:18:40,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:18:40,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:18:40,043 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-10-24 12:18:42,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:42,546 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-10-24 12:18:42,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:18:42,547 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-10-24 12:18:42,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:42,548 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:18:42,548 INFO L226 Difference]: Without dead ends: 106 [2018-10-24 12:18:42,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:18:42,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-24 12:18:42,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-24 12:18:42,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-24 12:18:42,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-10-24 12:18:42,560 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-10-24 12:18:42,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:42,560 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-10-24 12:18:42,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:18:42,561 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-10-24 12:18:42,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-24 12:18:42,562 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:42,562 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:42,563 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:42,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:42,563 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-10-24 12:18:42,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:42,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:42,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:42,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:42,564 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:42,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:43,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:43,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:43,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:43,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:43,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:43,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:43,321 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 12:18:43,329 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:43,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:43,420 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:18:43,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:43,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:43,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:43,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:45,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:45,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:45,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-24 12:18:45,094 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:45,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:18:45,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:18:45,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:18:45,096 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-10-24 12:18:45,316 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-10-24 12:18:47,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:47,941 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-10-24 12:18:47,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:18:47,941 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-10-24 12:18:47,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:47,943 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:18:47,943 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:18:47,946 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-10-24 12:18:47,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:18:47,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-24 12:18:47,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:18:47,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-10-24 12:18:47,953 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-10-24 12:18:47,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:47,954 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-10-24 12:18:47,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:18:47,954 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-10-24 12:18:47,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:18:47,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:47,956 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:47,956 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:47,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:47,956 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-10-24 12:18:47,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:47,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:47,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:47,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:47,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:48,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:48,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:48,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:48,853 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:48,853 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:48,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:48,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:48,853 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 12:18:48,860 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:48,861 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:48,925 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:48,925 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:48,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:49,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:49,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:51,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:52,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:52,014 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:18:52,014 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:52,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:18:52,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:18:52,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:18:52,016 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-10-24 12:18:55,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:55,100 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-10-24 12:18:55,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:18:55,101 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-10-24 12:18:55,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:55,102 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:18:55,102 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:18:55,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:18:55,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:18:55,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-24 12:18:55,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-24 12:18:55,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-10-24 12:18:55,111 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-10-24 12:18:55,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:55,111 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-10-24 12:18:55,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:18:55,111 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-10-24 12:18:55,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-24 12:18:55,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:55,113 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:55,114 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:55,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:55,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-10-24 12:18:55,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:55,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:55,115 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:55,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:55,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:55,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:56,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:56,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:56,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:56,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:56,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:56,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:56,109 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:56,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:56,118 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:56,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:56,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:56,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:56,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:58,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:58,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:58,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-24 12:18:58,999 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:58,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:18:59,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:18:59,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:18:59,001 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-10-24 12:19:03,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:03,084 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-10-24 12:19:03,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:19:03,084 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-10-24 12:19:03,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:03,085 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:19:03,085 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:19:03,091 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-10-24 12:19:03,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:19:03,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-24 12:19:03,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:19:03,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-10-24 12:19:03,097 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-10-24 12:19:03,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:03,097 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-10-24 12:19:03,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:19:03,098 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-10-24 12:19:03,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-24 12:19:03,099 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:03,099 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:03,099 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:03,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:03,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-10-24 12:19:03,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:03,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:03,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:03,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:03,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:03,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:04,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:04,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:04,672 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:04,672 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:04,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:04,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:04,673 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:04,680 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:04,680 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:04,724 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-24 12:19:04,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:04,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:04,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:04,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:07,382 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:07,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:07,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-24 12:19:07,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:07,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:19:07,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:19:07,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:19:07,404 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-10-24 12:19:11,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:11,874 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-24 12:19:11,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:19:11,875 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-10-24 12:19:11,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:11,876 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:19:11,876 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:19:11,878 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:19:11,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:19:11,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-24 12:19:11,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-24 12:19:11,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-10-24 12:19:11,886 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-10-24 12:19:11,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:11,886 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-10-24 12:19:11,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:19:11,886 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-10-24 12:19:11,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-10-24 12:19:11,888 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:11,888 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:11,888 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:11,888 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:11,889 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-10-24 12:19:11,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:11,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,890 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:11,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,890 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:11,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:13,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:13,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:13,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:13,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:13,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:13,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:13,179 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:13,186 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:13,186 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:13,254 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:13,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:13,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:13,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:13,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:16,305 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:16,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:16,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-24 12:19:16,326 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:16,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:19:16,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:19:16,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:19:16,328 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-10-24 12:19:21,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:21,383 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-10-24 12:19:21,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:19:21,384 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-10-24 12:19:21,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:21,385 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:19:21,385 INFO L226 Difference]: Without dead ends: 151 [2018-10-24 12:19:21,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-10-24 12:19:21,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-24 12:19:21,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-24 12:19:21,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:19:21,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-10-24 12:19:21,393 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-10-24 12:19:21,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:21,393 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-10-24 12:19:21,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:19:21,394 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-10-24 12:19:21,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:19:21,395 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:21,395 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:21,395 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:21,396 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:21,396 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-10-24 12:19:21,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:21,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:21,397 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:21,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:21,397 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:21,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:22,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:22,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:22,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:22,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:22,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:22,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:22,947 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:22,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:22,955 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:23,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:23,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:23,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:23,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:26,859 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:26,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:26,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-24 12:19:26,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:26,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:19:26,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:19:26,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:19:26,881 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-10-24 12:19:27,275 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-10-24 12:19:27,402 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:19:27,531 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-24 12:19:32,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:32,963 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-10-24 12:19:32,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:19:32,964 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-10-24 12:19:32,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:32,965 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:19:32,965 INFO L226 Difference]: Without dead ends: 160 [2018-10-24 12:19:32,967 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:19:32,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-24 12:19:32,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-10-24 12:19:32,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-24 12:19:32,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-10-24 12:19:32,973 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-10-24 12:19:32,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:32,973 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-10-24 12:19:32,974 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:19:32,974 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-10-24 12:19:32,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-24 12:19:32,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:32,974 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:32,975 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:32,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:32,975 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-10-24 12:19:32,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:32,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:32,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:32,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:32,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:33,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:34,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:34,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:34,974 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:34,974 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:34,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:34,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:34,974 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:34,982 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:34,982 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:35,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-24 12:19:35,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:35,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:35,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:35,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:39,148 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:39,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:39,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-24 12:19:39,169 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:39,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:19:39,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:19:39,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:19:39,171 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-10-24 12:19:39,340 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-10-24 12:19:39,580 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-10-24 12:19:39,716 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:19:39,863 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:19:39,997 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:19:40,142 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:19:40,286 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-24 12:19:45,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:45,878 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-10-24 12:19:45,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:19:45,879 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-10-24 12:19:45,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:45,880 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:19:45,880 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:19:45,882 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-10-24 12:19:45,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:19:45,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-24 12:19:45,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:19:45,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-10-24 12:19:45,888 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-10-24 12:19:45,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:45,888 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-10-24 12:19:45,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:19:45,888 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-10-24 12:19:45,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-24 12:19:45,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:45,889 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:45,889 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:45,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:45,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-10-24 12:19:45,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:45,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:45,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:45,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:45,892 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:46,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:47,594 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:47,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:47,594 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:47,594 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:47,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:47,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:47,595 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:47,606 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:47,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:47,720 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:47,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:47,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:47,945 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:47,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:51,996 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:52,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:52,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-24 12:19:52,018 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:52,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:19:52,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:19:52,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:19:52,019 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-10-24 12:19:52,193 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-10-24 12:19:52,318 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-10-24 12:19:52,456 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-10-24 12:19:52,603 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:19:52,753 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:19:52,913 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:19:53,068 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:19:53,227 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:19:53,381 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:19:53,536 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:19:53,698 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-24 12:19:59,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:59,751 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-10-24 12:19:59,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:19:59,751 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-10-24 12:19:59,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:59,753 INFO L225 Difference]: With dead ends: 183 [2018-10-24 12:19:59,753 INFO L226 Difference]: Without dead ends: 178 [2018-10-24 12:19:59,755 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-10-24 12:19:59,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-24 12:19:59,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-10-24 12:19:59,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-24 12:19:59,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-10-24 12:19:59,763 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-10-24 12:19:59,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:59,763 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-10-24 12:19:59,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:19:59,763 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-10-24 12:19:59,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-24 12:19:59,764 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:59,765 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:59,765 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:59,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:59,765 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-10-24 12:19:59,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:59,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:59,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:59,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:59,766 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:59,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:01,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:01,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:01,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:01,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:01,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:01,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:01,683 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:01,697 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:01,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:01,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:02,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:02,415 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:02,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:06,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:06,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:06,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:20:06,871 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:06,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:20:06,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:20:06,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:20:06,873 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-10-24 12:20:07,090 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-10-24 12:20:07,223 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-10-24 12:20:07,378 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-10-24 12:20:07,542 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:20:07,721 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:20:07,889 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:20:08,056 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:20:08,229 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:20:08,412 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:20:08,584 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:20:08,753 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:20:08,929 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:20:09,282 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-24 12:20:10,009 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-10-24 12:20:15,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:15,587 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-10-24 12:20:15,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:20:15,587 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-10-24 12:20:15,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:15,589 INFO L225 Difference]: With dead ends: 192 [2018-10-24 12:20:15,590 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:20:15,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-10-24 12:20:15,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:20:15,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-24 12:20:15,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:20:15,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-10-24 12:20:15,599 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-10-24 12:20:15,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:15,599 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-10-24 12:20:15,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:20:15,599 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-10-24 12:20:15,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:20:15,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:15,601 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:15,601 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:15,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:15,601 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-10-24 12:20:15,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:15,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:15,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:15,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:15,602 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:15,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:17,891 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:17,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:17,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:17,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:17,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:17,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:17,892 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:17,910 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:17,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:18,053 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-10-24 12:20:18,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:18,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:18,253 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:18,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:23,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:23,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-24 12:20:23,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:23,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-24 12:20:23,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-24 12:20:23,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:20:23,172 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-10-24 12:20:23,429 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-10-24 12:20:23,568 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-10-24 12:20:23,729 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-10-24 12:20:23,895 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:20:24,063 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:20:24,233 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:20:24,407 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:20:24,585 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:20:24,763 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:20:24,950 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:20:25,139 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:20:25,327 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:20:25,515 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:20:25,697 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:20:26,094 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:20:33,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:33,075 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-10-24 12:20:33,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:20:33,077 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-10-24 12:20:33,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:33,078 INFO L225 Difference]: With dead ends: 201 [2018-10-24 12:20:33,078 INFO L226 Difference]: Without dead ends: 196 [2018-10-24 12:20:33,080 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-10-24 12:20:33,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-24 12:20:33,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-10-24 12:20:33,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-24 12:20:33,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-10-24 12:20:33,086 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-10-24 12:20:33,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:33,086 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-10-24 12:20:33,087 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-24 12:20:33,087 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-10-24 12:20:33,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-24 12:20:33,088 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:33,088 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:33,088 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:33,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:33,089 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-10-24 12:20:33,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:33,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:33,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:33,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:33,090 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:33,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:35,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:35,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:35,378 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:35,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:35,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:35,378 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:35,386 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:35,386 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:35,602 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:35,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:35,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:35,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:35,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:41,336 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:41,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:41,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-24 12:20:41,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:41,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:20:41,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:20:41,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:20:41,360 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-10-24 12:20:41,575 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-10-24 12:20:41,724 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-10-24 12:20:41,901 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-10-24 12:20:42,077 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:20:42,257 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:20:42,441 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:20:42,631 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:20:42,826 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:20:43,016 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:20:43,211 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:20:43,416 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:20:43,627 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:20:43,831 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:20:44,031 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:20:44,236 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:20:44,447 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:20:44,650 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:20:45,019 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:20:45,222 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:20:52,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:52,464 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-10-24 12:20:52,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:20:52,464 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-10-24 12:20:52,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:52,466 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:20:52,466 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:20:52,467 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-10-24 12:20:52,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:20:52,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-10-24 12:20:52,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-24 12:20:52,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-10-24 12:20:52,475 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-10-24 12:20:52,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:52,475 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-10-24 12:20:52,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:20:52,475 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-10-24 12:20:52,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:20:52,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:52,476 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:52,477 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:52,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:52,477 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-10-24 12:20:52,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:52,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:52,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:52,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:52,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:52,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:54,869 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:54,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:54,870 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:54,870 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:54,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:54,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:54,870 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:54,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:54,878 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:55,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:55,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:55,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:55,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:01,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:01,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-24 12:21:01,539 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:01,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:21:01,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:21:01,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:21:01,540 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-10-24 12:21:01,770 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-10-24 12:21:01,925 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-10-24 12:21:02,102 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-10-24 12:21:02,285 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:21:02,473 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:21:02,664 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:21:02,858 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:21:03,068 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:21:03,271 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:21:03,481 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:21:03,695 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:21:03,913 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:21:04,130 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:21:04,344 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:21:04,560 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:21:04,773 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:21:04,996 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:21:05,250 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:21:05,465 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:21:05,678 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:21:05,900 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:21:09,120 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-10-24 12:21:13,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:13,865 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-10-24 12:21:13,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:21:13,866 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-10-24 12:21:13,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:13,867 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:21:13,867 INFO L226 Difference]: Without dead ends: 214 [2018-10-24 12:21:13,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-10-24 12:21:13,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-24 12:21:13,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-10-24 12:21:13,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-24 12:21:13,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-10-24 12:21:13,877 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-10-24 12:21:13,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:13,877 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-10-24 12:21:13,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:21:13,877 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-10-24 12:21:13,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-24 12:21:13,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:13,879 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:13,879 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:13,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:13,879 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-10-24 12:21:13,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:13,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:13,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:13,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:13,880 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:16,471 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:16,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:16,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:16,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:16,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:16,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:16,472 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:16,480 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:21:16,480 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:21:16,664 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-10-24 12:21:16,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:16,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:16,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:16,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:23,272 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:23,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:23,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-24 12:21:23,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:23,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:21:23,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:21:23,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:21:23,295 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-10-24 12:21:24,063 WARN L179 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-10-24 12:21:24,231 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-10-24 12:21:24,435 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-10-24 12:21:24,632 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-24 12:21:24,841 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-24 12:21:25,048 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-24 12:21:25,257 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:21:25,478 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:21:25,695 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:21:25,917 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:21:26,141 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:21:26,364 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:21:26,585 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:21:26,817 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:21:27,057 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:21:27,282 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:21:27,509 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:21:28,604 WARN L179 SmtUtils]: Spent 572.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:21:28,833 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:21:29,075 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:21:29,306 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:21:29,543 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:21:29,780 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:21:30,012 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:21:38,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:38,608 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-10-24 12:21:38,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:21:38,611 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-10-24 12:21:38,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:38,612 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:21:38,613 INFO L226 Difference]: Without dead ends: 223 [2018-10-24 12:21:38,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-10-24 12:21:38,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-24 12:21:38,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-10-24 12:21:38,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-24 12:21:38,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-10-24 12:21:38,623 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-10-24 12:21:38,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:38,624 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-10-24 12:21:38,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:21:38,624 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-10-24 12:21:38,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:21:38,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:38,625 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:38,625 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:38,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:38,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-10-24 12:21:38,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:38,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:38,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:38,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:38,627 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:38,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:41,484 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:41,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:41,485 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:41,485 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:41,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:41,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:41,485 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:41,494 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:21:41,494 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:21:41,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:21:41,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:42,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:42,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:42,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:49,433 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:49,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:49,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-24 12:21:49,455 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:49,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-24 12:21:49,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-24 12:21:49,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:21:49,457 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-10-24 12:21:49,804 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-10-24 12:21:49,985 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-10-24 12:21:50,193 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-10-24 12:21:50,404 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-24 12:21:50,620 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-24 12:21:50,846 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-24 12:21:51,076 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-24 12:21:51,309 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-24 12:21:51,548 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-24 12:21:51,785 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:21:52,029 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:21:52,271 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:21:52,517 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:21:52,764 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:21:52,999 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:21:53,254 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:21:53,498 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:21:53,743 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:21:53,986 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:21:54,234 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:21:54,499 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:21:54,752 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:21:54,990 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:21:55,249 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:21:55,500 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:21:55,759 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:21:56,008 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:22:04,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:22:04,705 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-10-24 12:22:04,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-24 12:22:04,706 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-10-24 12:22:04,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:22:04,707 INFO L225 Difference]: With dead ends: 237 [2018-10-24 12:22:04,707 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:22:04,709 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-10-24 12:22:04,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:22:04,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-10-24 12:22:04,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-10-24 12:22:04,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-10-24 12:22:04,718 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-10-24 12:22:04,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:22:04,718 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-10-24 12:22:04,719 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-24 12:22:04,719 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-10-24 12:22:04,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-10-24 12:22:04,720 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:22:04,720 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:22:04,720 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:22:04,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:22:04,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-10-24 12:22:04,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:22:04,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:22:04,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:22:04,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:22:04,722 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:22:05,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:22:08,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:22:08,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:22:08,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:22:08,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:22:08,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:22:08,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:22:08,604 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:22:08,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:22:08,611 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:22:09,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:22:09,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:22:09,745 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:22:09,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:22:17,176 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:22:17,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:22:17,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-10-24 12:22:17,198 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:22:17,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-24 12:22:17,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-24 12:22:17,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-10-24 12:22:17,200 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. Received shutdown request... [2018-10-24 12:22:17,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:22:17,294 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:22:17,297 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:22:17,298 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:22:17 BoogieIcfgContainer [2018-10-24 12:22:17,298 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:22:17,298 INFO L168 Benchmark]: Toolchain (without parser) took 246028.51 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 649.6 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -523.9 MB). Peak memory consumption was 125.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:17,299 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:22:17,299 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.13 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 12:22:17,299 INFO L168 Benchmark]: Boogie Procedure Inliner took 17.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:22:17,300 INFO L168 Benchmark]: Boogie Preprocessor took 18.49 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 12:22:17,300 INFO L168 Benchmark]: RCFGBuilder took 324.19 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 743.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -793.4 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:17,300 INFO L168 Benchmark]: TraceAbstraction took 245405.28 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -93.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 259.0 MB). Peak memory consumption was 165.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:17,302 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.13 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 17.32 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 18.49 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 324.19 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 743.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -793.4 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 245405.28 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -93.8 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 259.0 MB). Peak memory consumption was 165.1 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 constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 2 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 152 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 245.2s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 126.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 350 SDtfs, 3727 SDslu, 8646 SDs, 0 SdLazy, 3986 SolverSat, 2362 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8058 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2853 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28054 ImplicationChecksByTransitivity, 222.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.7s SatisfiabilityAnalysisTime, 110.9s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown