java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 10:40:39,658 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 10:40:39,660 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 10:40:39,674 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 10:40:39,675 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 10:40:39,679 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 10:40:39,680 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 10:40:39,683 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 10:40:39,684 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 10:40:39,688 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 10:40:39,689 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 10:40:39,689 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 10:40:39,690 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 10:40:39,691 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 10:40:39,692 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 10:40:39,693 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 10:40:39,694 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 10:40:39,696 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 10:40:39,697 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 10:40:39,699 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 10:40:39,700 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 10:40:39,701 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 10:40:39,704 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 10:40:39,704 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 10:40:39,704 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 10:40:39,705 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 10:40:39,706 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 10:40:39,707 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 10:40:39,708 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 10:40:39,709 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 10:40:39,709 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 10:40:39,710 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 10:40:39,710 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 10:40:39,711 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 10:40:39,712 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 10:40:39,712 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 10:40:39,713 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-11-07 10:40:39,746 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 10:40:39,746 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 10:40:39,747 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 10:40:39,747 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 10:40:39,747 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 10:40:39,748 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 10:40:39,748 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-07 10:40:39,748 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 10:40:39,748 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 10:40:39,749 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 10:40:39,749 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 10:40:39,749 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 10:40:39,749 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 10:40:39,749 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 10:40:39,750 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 10:40:39,750 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 10:40:39,751 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 10:40:39,751 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 10:40:39,751 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 10:40:39,752 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 10:40:39,752 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 10:40:39,752 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 10:40:39,752 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 10:40:39,752 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 10:40:39,753 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 10:40:39,753 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 10:40:39,753 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 10:40:39,753 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 10:40:39,753 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 10:40:39,754 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 10:40:39,754 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 10:40:39,754 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 10:40:39,755 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 10:40:39,755 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 10:40:39,755 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 10:40:39,755 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 10:40:39,820 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 10:40:39,836 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 10:40:39,841 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 10:40:39,843 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 10:40:39,843 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 10:40:39,845 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 10:40:39,903 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c697983e9/3ee9b45b5ad845a086b92b0d1409d8ca/FLAGc38ba508c [2018-11-07 10:40:40,395 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 10:40:40,397 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 10:40:40,404 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c697983e9/3ee9b45b5ad845a086b92b0d1409d8ca/FLAGc38ba508c [2018-11-07 10:40:40,423 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c697983e9/3ee9b45b5ad845a086b92b0d1409d8ca [2018-11-07 10:40:40,436 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 10:40:40,439 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 10:40:40,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 10:40:40,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 10:40:40,445 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 10:40:40,446 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,449 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b4e822e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40, skipping insertion in model container [2018-11-07 10:40:40,450 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,461 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 10:40:40,489 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 10:40:40,678 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:40:40,682 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 10:40:40,700 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:40:40,716 INFO L193 MainTranslator]: Completed translation [2018-11-07 10:40:40,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40 WrapperNode [2018-11-07 10:40:40,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 10:40:40,718 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 10:40:40,718 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 10:40:40,718 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 10:40:40,728 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,735 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,741 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 10:40:40,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 10:40:40,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 10:40:40,742 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 10:40:40,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,754 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,755 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,758 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,763 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,764 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... [2018-11-07 10:40:40,766 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 10:40:40,766 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 10:40:40,767 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 10:40:40,767 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 10:40:40,768 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:40,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 10:40:40,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 10:40:40,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 10:40:40,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 10:40:40,942 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 10:40:40,942 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 10:40:40,942 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 10:40:40,942 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 10:40:41,203 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 10:40:41,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:40:41 BoogieIcfgContainer [2018-11-07 10:40:41,204 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 10:40:41,205 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 10:40:41,205 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 10:40:41,208 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 10:40:41,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:40:40" (1/3) ... [2018-11-07 10:40:41,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b2ffb37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:40:41, skipping insertion in model container [2018-11-07 10:40:41,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:40:40" (2/3) ... [2018-11-07 10:40:41,210 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b2ffb37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:40:41, skipping insertion in model container [2018-11-07 10:40:41,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:40:41" (3/3) ... [2018-11-07 10:40:41,212 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-11-07 10:40:41,223 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 10:40:41,231 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 10:40:41,259 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 10:40:41,317 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 10:40:41,317 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 10:40:41,317 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 10:40:41,318 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 10:40:41,318 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 10:40:41,318 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 10:40:41,318 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 10:40:41,318 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 10:40:41,349 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 10:40:41,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 10:40:41,357 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:41,358 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:41,361 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:41,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:41,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-11-07 10:40:41,373 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:41,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:41,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:41,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:41,448 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:41,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:41,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:41,513 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:40:41,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 10:40:41,514 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:40:41,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 10:40:41,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 10:40:41,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 10:40:41,533 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 10:40:41,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:41,561 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-07 10:40:41,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 10:40:41,563 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-11-07 10:40:41,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:41,572 INFO L225 Difference]: With dead ends: 33 [2018-11-07 10:40:41,573 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 10:40:41,577 INFO L604 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 [2018-11-07 10:40:41,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 10:40:41,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 10:40:41,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 10:40:41,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-07 10:40:41,618 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-07 10:40:41,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:41,619 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-07 10:40:41,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 10:40:41,620 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-07 10:40:41,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-07 10:40:41,621 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:41,621 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:41,622 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:41,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:41,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-11-07 10:40:41,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:41,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:41,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:41,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:41,624 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:41,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:41,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:41,852 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:40:41,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 10:40:41,853 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:40:41,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 10:40:41,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 10:40:41,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 10:40:41,856 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-11-07 10:40:41,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:41,994 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 10:40:41,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 10:40:41,995 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-11-07 10:40:41,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:41,996 INFO L225 Difference]: With dead ends: 21 [2018-11-07 10:40:41,996 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 10:40:41,997 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-07 10:40:41,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 10:40:42,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 10:40:42,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 10:40:42,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-07 10:40:42,002 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-11-07 10:40:42,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:42,003 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-07 10:40:42,003 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 10:40:42,003 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-07 10:40:42,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 10:40:42,004 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:42,004 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:42,005 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:42,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:42,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-11-07 10:40:42,005 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:42,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:42,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:42,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:42,007 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:42,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:42,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:42,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:42,127 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:42,128 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 10:40:42,130 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 10:40:42,164 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-07 10:40:42,164 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 10:40:42,311 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 10:40:42,313 INFO L272 AbstractInterpreter]: Visited 14 different actions 30 times. Merged at 4 different actions 8 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 10:40:42,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:42,339 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 10:40:42,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:42,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:42,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:42,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:40:42,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:42,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:42,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:42,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:42,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:42,829 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:42,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 10:40:42,829 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:42,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 10:40:42,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 10:40:42,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-07 10:40:42,831 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-11-07 10:40:42,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:42,981 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 10:40:42,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 10:40:42,981 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 10:40:42,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:42,982 INFO L225 Difference]: With dead ends: 30 [2018-11-07 10:40:42,982 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 10:40:42,983 INFO L604 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 [2018-11-07 10:40:42,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 10:40:42,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-07 10:40:42,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-07 10:40:42,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-11-07 10:40:42,988 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-11-07 10:40:42,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:42,989 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-11-07 10:40:42,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 10:40:42,989 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-11-07 10:40:42,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-07 10:40:42,990 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:42,990 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:42,990 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:42,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:42,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-11-07 10:40:42,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:42,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:42,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:42,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:42,992 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:43,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:43,291 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:43,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:43,294 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:43,294 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:43,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:43,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:43,295 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:43,307 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:40:43,307 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:40:43,325 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 10:40:43,325 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:40:43,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:43,494 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:43,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:43,779 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:43,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:43,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 10:40:43,812 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:43,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 10:40:43,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 10:40:43,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-11-07 10:40:43,817 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-11-07 10:40:44,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:44,265 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-11-07 10:40:44,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 10:40:44,267 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-11-07 10:40:44,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:44,268 INFO L225 Difference]: With dead ends: 39 [2018-11-07 10:40:44,268 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 10:40:44,269 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-11-07 10:40:44,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 10:40:44,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 10:40:44,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 10:40:44,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-07 10:40:44,275 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-11-07 10:40:44,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:44,276 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-07 10:40:44,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 10:40:44,276 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-07 10:40:44,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-07 10:40:44,278 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:44,278 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:44,278 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:44,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:44,278 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-11-07 10:40:44,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:44,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:44,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:40:44,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:44,280 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:44,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:44,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:44,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:44,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:44,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:44,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:44,438 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:44,454 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:40:44,455 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:40:44,482 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:40:44,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:40:44,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:44,590 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:44,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:44,893 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:44,921 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:44,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 10:40:44,921 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:44,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 10:40:44,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 10:40:44,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 10:40:44,923 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-11-07 10:40:45,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:45,267 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-11-07 10:40:45,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 10:40:45,271 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-11-07 10:40:45,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:45,273 INFO L225 Difference]: With dead ends: 48 [2018-11-07 10:40:45,273 INFO L226 Difference]: Without dead ends: 43 [2018-11-07 10:40:45,277 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-11-07 10:40:45,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-07 10:40:45,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-11-07 10:40:45,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 10:40:45,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-11-07 10:40:45,291 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-11-07 10:40:45,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:45,292 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-11-07 10:40:45,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 10:40:45,292 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-11-07 10:40:45,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-07 10:40:45,297 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:45,297 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:45,298 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:45,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:45,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-11-07 10:40:45,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:45,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:45,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:40:45,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:45,305 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:45,608 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:45,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:45,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:45,609 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:45,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:45,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:45,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:45,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:45,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:40:45,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:45,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:45,725 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:45,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:46,335 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:46,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:46,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 10:40:46,355 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:46,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 10:40:46,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 10:40:46,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-11-07 10:40:46,356 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-11-07 10:40:46,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:46,961 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-11-07 10:40:46,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 10:40:46,964 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-11-07 10:40:46,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:46,965 INFO L225 Difference]: With dead ends: 57 [2018-11-07 10:40:46,965 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 10:40:46,966 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 10:40:46,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 10:40:46,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-11-07 10:40:46,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-07 10:40:46,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-11-07 10:40:46,974 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-11-07 10:40:46,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:46,975 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-11-07 10:40:46,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 10:40:46,975 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-11-07 10:40:46,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 10:40:46,976 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:46,977 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:46,977 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:46,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:46,977 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-11-07 10:40:46,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:46,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:46,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:46,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:46,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:47,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:48,022 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:48,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:48,023 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:48,023 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:48,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:48,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:48,023 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:48,032 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:40:48,032 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:40:48,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-07 10:40:48,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:40:48,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:48,192 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:48,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:48,682 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:48,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:48,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 10:40:48,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:48,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 10:40:48,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 10:40:48,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-11-07 10:40:48,706 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-11-07 10:40:49,520 WARN L179 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 11 [2018-11-07 10:40:49,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:49,760 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-11-07 10:40:49,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 10:40:49,761 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-11-07 10:40:49,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:49,763 INFO L225 Difference]: With dead ends: 66 [2018-11-07 10:40:49,763 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 10:40:49,765 INFO L604 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 [2018-11-07 10:40:49,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 10:40:49,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-07 10:40:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-07 10:40:49,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-11-07 10:40:49,773 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-11-07 10:40:49,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:49,774 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-11-07 10:40:49,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 10:40:49,774 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-11-07 10:40:49,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-07 10:40:49,776 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:49,776 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:49,776 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:49,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:49,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-11-07 10:40:49,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:49,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:49,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:40:49,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:49,778 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:49,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:50,318 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:50,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:50,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:50,319 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:50,319 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:50,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:50,319 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:50,335 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:40:50,335 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:40:50,370 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:40:50,370 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:40:50,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:50,551 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:51,329 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:51,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:51,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 10:40:51,349 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:51,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 10:40:51,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 10:40:51,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 10:40:51,350 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-11-07 10:40:52,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:52,192 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-11-07 10:40:52,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 10:40:52,193 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-11-07 10:40:52,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:52,194 INFO L225 Difference]: With dead ends: 75 [2018-11-07 10:40:52,194 INFO L226 Difference]: Without dead ends: 70 [2018-11-07 10:40:52,196 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 10:40:52,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-07 10:40:52,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-11-07 10:40:52,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-07 10:40:52,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-11-07 10:40:52,204 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-11-07 10:40:52,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:52,204 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-11-07 10:40:52,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 10:40:52,204 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-11-07 10:40:52,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 10:40:52,206 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:52,206 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:52,206 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:52,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:52,206 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-11-07 10:40:52,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:52,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:52,208 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:40:52,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:52,208 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:52,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:53,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:53,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:53,112 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:53,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:53,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:53,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:53,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:53,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:40:53,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:53,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:53,292 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:53,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:54,475 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:54,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:54,496 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 10:40:54,496 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:54,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 10:40:54,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 10:40:54,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 10:40:54,497 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-11-07 10:40:55,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:55,584 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-11-07 10:40:55,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 10:40:55,587 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-11-07 10:40:55,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:55,588 INFO L225 Difference]: With dead ends: 84 [2018-11-07 10:40:55,588 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 10:40:55,590 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 10:40:55,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 10:40:55,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 10:40:55,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 10:40:55,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-11-07 10:40:55,599 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-11-07 10:40:55,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:55,600 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-11-07 10:40:55,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 10:40:55,600 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-11-07 10:40:55,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-07 10:40:55,602 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:55,602 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:55,602 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:55,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:55,602 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-11-07 10:40:55,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:55,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:55,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:40:55,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:55,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:55,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:56,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:56,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:56,199 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:56,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:56,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:56,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:56,210 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:40:56,210 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:40:56,236 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-11-07 10:40:56,236 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:40:56,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:40:56,384 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:56,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:40:57,260 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:57,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:40:57,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-07 10:40:57,282 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:40:57,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 10:40:57,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 10:40:57,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 10:40:57,284 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-11-07 10:40:58,161 WARN L179 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-11-07 10:40:58,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:40:58,963 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-07 10:40:58,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 10:40:58,970 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-11-07 10:40:58,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:40:58,971 INFO L225 Difference]: With dead ends: 93 [2018-11-07 10:40:58,971 INFO L226 Difference]: Without dead ends: 88 [2018-11-07 10:40:58,973 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 10:40:58,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-07 10:40:58,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-11-07 10:40:58,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-07 10:40:58,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-11-07 10:40:58,981 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-11-07 10:40:58,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:40:58,981 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-11-07 10:40:58,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 10:40:58,982 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-11-07 10:40:58,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 10:40:58,983 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:40:58,983 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:40:58,983 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:40:58,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:40:58,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-11-07 10:40:58,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:40:58,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:58,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:40:58,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:40:58,985 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:40:59,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:40:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:40:59,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:59,988 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:40:59,988 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:40:59,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:40:59,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:40:59,989 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:40:59,997 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:40:59,997 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:41:00,022 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:41:00,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:00,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:00,131 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:00,131 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:01,182 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:01,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:01,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-11-07 10:41:01,202 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:01,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 10:41:01,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 10:41:01,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 10:41:01,204 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-11-07 10:41:01,913 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-11-07 10:41:03,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:03,388 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-11-07 10:41:03,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 10:41:03,394 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-11-07 10:41:03,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:03,395 INFO L225 Difference]: With dead ends: 102 [2018-11-07 10:41:03,395 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 10:41:03,398 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 10:41:03,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 10:41:03,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-07 10:41:03,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-07 10:41:03,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-11-07 10:41:03,408 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-11-07 10:41:03,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:03,408 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-11-07 10:41:03,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 10:41:03,408 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-11-07 10:41:03,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-07 10:41:03,413 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:03,413 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:03,413 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:03,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:03,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-11-07 10:41:03,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:03,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:03,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:41:03,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:03,418 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:03,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:04,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:04,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:04,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:04,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:04,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:04,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:04,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:04,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:04,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:41:04,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:04,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:04,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:04,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:05,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:05,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:05,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-11-07 10:41:05,966 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:05,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 10:41:05,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 10:41:05,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 10:41:05,968 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-11-07 10:41:08,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:08,046 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-11-07 10:41:08,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 10:41:08,047 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-11-07 10:41:08,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:08,048 INFO L225 Difference]: With dead ends: 111 [2018-11-07 10:41:08,048 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 10:41:08,050 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 10:41:08,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 10:41:08,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-11-07 10:41:08,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-07 10:41:08,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-11-07 10:41:08,058 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-11-07 10:41:08,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:08,059 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-11-07 10:41:08,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 10:41:08,059 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-11-07 10:41:08,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-07 10:41:08,061 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:08,061 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:08,061 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:08,061 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:08,062 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-11-07 10:41:08,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:08,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:08,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:08,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:08,063 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:08,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:09,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:09,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:09,078 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:09,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:09,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:09,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:09,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:09,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:41:09,089 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:41:09,149 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-07 10:41:09,149 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:09,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:09,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:09,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:10,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:10,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:10,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-11-07 10:41:10,807 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:10,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 10:41:10,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 10:41:10,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 10:41:10,809 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-11-07 10:41:11,028 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-11-07 10:41:13,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:13,267 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-11-07 10:41:13,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 10:41:13,268 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-11-07 10:41:13,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:13,269 INFO L225 Difference]: With dead ends: 120 [2018-11-07 10:41:13,269 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 10:41:13,272 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 10:41:13,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 10:41:13,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-11-07 10:41:13,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 10:41:13,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-11-07 10:41:13,281 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-11-07 10:41:13,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:13,281 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-11-07 10:41:13,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 10:41:13,282 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-11-07 10:41:13,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 10:41:13,283 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:13,283 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:13,283 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:13,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:13,284 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-11-07 10:41:13,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:13,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:13,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:41:13,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:13,285 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:14,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:14,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:14,242 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:14,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:14,243 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:14,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:14,243 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:14,252 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:41:14,252 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:41:14,306 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:41:14,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:14,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:14,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:14,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:16,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:16,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:16,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-11-07 10:41:16,711 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:16,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 10:41:16,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 10:41:16,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 10:41:16,713 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-11-07 10:41:19,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:19,641 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-11-07 10:41:19,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 10:41:19,641 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-11-07 10:41:19,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:19,642 INFO L225 Difference]: With dead ends: 129 [2018-11-07 10:41:19,642 INFO L226 Difference]: Without dead ends: 124 [2018-11-07 10:41:19,644 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 10:41:19,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-11-07 10:41:19,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-11-07 10:41:19,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-11-07 10:41:19,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-11-07 10:41:19,652 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-11-07 10:41:19,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:19,652 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-11-07 10:41:19,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 10:41:19,652 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-11-07 10:41:19,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-07 10:41:19,654 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:19,654 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:19,654 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:19,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:19,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-11-07 10:41:19,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:19,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:19,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:41:19,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:19,656 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:19,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:20,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:20,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:20,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:20,598 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:20,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:20,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:20,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:20,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:20,607 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:41:20,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:20,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:20,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:20,836 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:23,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:23,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:23,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-11-07 10:41:23,078 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:23,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 10:41:23,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 10:41:23,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 10:41:23,081 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-11-07 10:41:26,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:26,800 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-11-07 10:41:26,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 10:41:26,800 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-11-07 10:41:26,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:26,805 INFO L225 Difference]: With dead ends: 138 [2018-11-07 10:41:26,805 INFO L226 Difference]: Without dead ends: 133 [2018-11-07 10:41:26,806 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-11-07 10:41:26,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-07 10:41:26,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-11-07 10:41:26,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-11-07 10:41:26,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-11-07 10:41:26,813 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-11-07 10:41:26,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:26,813 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-11-07 10:41:26,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 10:41:26,813 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-11-07 10:41:26,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-11-07 10:41:26,814 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:26,815 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:26,815 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:26,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:26,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-11-07 10:41:26,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:26,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:26,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:26,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:26,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:26,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:27,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:27,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:27,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:27,911 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:27,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:27,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:27,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:27,921 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:41:27,921 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:41:27,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-11-07 10:41:27,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:27,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:28,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:28,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:30,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:30,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:30,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-11-07 10:41:30,829 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:30,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 10:41:30,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 10:41:30,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 10:41:30,831 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-11-07 10:41:35,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:35,011 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-11-07 10:41:35,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 10:41:35,012 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-11-07 10:41:35,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:35,013 INFO L225 Difference]: With dead ends: 147 [2018-11-07 10:41:35,013 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 10:41:35,014 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 10:41:35,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 10:41:35,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-11-07 10:41:35,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-07 10:41:35,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-11-07 10:41:35,021 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-11-07 10:41:35,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:35,022 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-11-07 10:41:35,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 10:41:35,022 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-11-07 10:41:35,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-11-07 10:41:35,023 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:35,024 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:35,024 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:35,024 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:35,024 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-11-07 10:41:35,024 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:35,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:35,025 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:41:35,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:35,025 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:35,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:36,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:36,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:36,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:36,221 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:36,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:36,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:36,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:36,230 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:41:36,230 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:41:36,271 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:41:36,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:36,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:36,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:36,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:39,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:39,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:39,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-11-07 10:41:39,502 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:39,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 10:41:39,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 10:41:39,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 10:41:39,504 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-11-07 10:41:44,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:44,199 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-11-07 10:41:44,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 10:41:44,199 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-11-07 10:41:44,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:44,200 INFO L225 Difference]: With dead ends: 156 [2018-11-07 10:41:44,201 INFO L226 Difference]: Without dead ends: 151 [2018-11-07 10:41:44,202 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-11-07 10:41:44,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-07 10:41:44,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-11-07 10:41:44,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-07 10:41:44,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-11-07 10:41:44,209 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-11-07 10:41:44,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:44,209 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-11-07 10:41:44,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 10:41:44,209 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-11-07 10:41:44,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-07 10:41:44,210 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:44,210 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:44,211 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:44,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:44,211 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-11-07 10:41:44,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:44,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:44,212 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:41:44,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:44,212 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:44,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:45,539 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:45,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:45,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:45,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:45,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:45,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:45,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:45,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:45,551 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:41:45,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:45,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:46,064 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:46,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:41:49,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:49,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:41:49,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-11-07 10:41:49,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:41:49,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 10:41:49,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 10:41:49,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 10:41:49,221 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-11-07 10:41:49,437 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 8 [2018-11-07 10:41:49,560 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 8 [2018-11-07 10:41:55,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:41:55,012 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-11-07 10:41:55,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 10:41:55,012 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-11-07 10:41:55,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:41:55,014 INFO L225 Difference]: With dead ends: 165 [2018-11-07 10:41:55,014 INFO L226 Difference]: Without dead ends: 160 [2018-11-07 10:41:55,015 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 10:41:55,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-07 10:41:55,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-11-07 10:41:55,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 10:41:55,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-11-07 10:41:55,022 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-11-07 10:41:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:41:55,022 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-11-07 10:41:55,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 10:41:55,022 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-11-07 10:41:55,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 10:41:55,023 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:41:55,023 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:41:55,023 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:41:55,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:41:55,024 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-11-07 10:41:55,024 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:41:55,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:55,025 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:41:55,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:41:55,025 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:41:55,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:41:56,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:56,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:56,499 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:41:56,499 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:41:56,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:41:56,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:41:56,499 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:41:56,508 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:41:56,508 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:41:56,559 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-11-07 10:41:56,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:41:56,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:41:56,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:41:56,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:42:00,496 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:00,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:42:00,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-11-07 10:42:00,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:42:00,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-07 10:42:00,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-07 10:42:00,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 10:42:00,518 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-11-07 10:42:00,929 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-11-07 10:42:01,078 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:42:01,226 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:42:01,356 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:42:06,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:42:06,830 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-11-07 10:42:06,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 10:42:06,832 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-11-07 10:42:06,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:42:06,834 INFO L225 Difference]: With dead ends: 174 [2018-11-07 10:42:06,834 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 10:42:06,836 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-11-07 10:42:06,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 10:42:06,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-07 10:42:06,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-07 10:42:06,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-11-07 10:42:06,843 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-11-07 10:42:06,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:42:06,844 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-11-07 10:42:06,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-07 10:42:06,844 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-11-07 10:42:06,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-11-07 10:42:06,845 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:42:06,845 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:42:06,845 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:42:06,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:42:06,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-11-07 10:42:06,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:42:06,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:06,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:42:06,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:06,847 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:42:07,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:42:08,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:08,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:08,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:42:08,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:42:08,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:42:08,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:08,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:42:08,659 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:42:08,659 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:42:08,749 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:42:08,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:42:08,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:42:08,949 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:08,949 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:42:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:13,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:42:13,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-11-07 10:42:13,112 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:42:13,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 10:42:13,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 10:42:13,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 10:42:13,114 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-11-07 10:42:13,286 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-11-07 10:42:13,405 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-11-07 10:42:13,542 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-11-07 10:42:13,701 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:42:13,859 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:42:14,000 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:42:14,146 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:42:14,299 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:42:14,447 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:42:14,595 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 10:42:14,750 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 10:42:14,922 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-07 10:42:15,097 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-11-07 10:42:20,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:42:20,525 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-11-07 10:42:20,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-07 10:42:20,526 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-11-07 10:42:20,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:42:20,528 INFO L225 Difference]: With dead ends: 183 [2018-11-07 10:42:20,528 INFO L226 Difference]: Without dead ends: 178 [2018-11-07 10:42:20,530 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-11-07 10:42:20,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-11-07 10:42:20,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-11-07 10:42:20,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-07 10:42:20,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-11-07 10:42:20,538 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-11-07 10:42:20,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:42:20,538 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-11-07 10:42:20,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 10:42:20,538 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-11-07 10:42:20,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-07 10:42:20,539 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:42:20,540 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:42:20,540 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:42:20,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:42:20,540 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-11-07 10:42:20,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:42:20,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:20,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:42:20,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:20,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:42:20,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:42:22,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:22,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:22,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:42:22,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:42:22,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:42:22,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:22,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:42:22,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:42:22,383 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:42:22,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:42:22,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:42:22,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:22,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:42:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:27,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:42:27,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-11-07 10:42:27,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:42:27,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-07 10:42:27,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-07 10:42:27,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 10:42:27,622 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-11-07 10:42:27,838 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-11-07 10:42:27,970 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-11-07 10:42:28,119 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-11-07 10:42:28,274 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:42:28,430 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:42:28,594 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:42:28,749 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:42:28,910 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:42:29,071 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:42:29,231 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:42:29,391 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:42:29,554 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:42:30,210 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-11-07 10:42:35,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:42:35,985 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-11-07 10:42:35,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 10:42:35,986 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-11-07 10:42:35,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:42:35,988 INFO L225 Difference]: With dead ends: 192 [2018-11-07 10:42:35,988 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 10:42:35,990 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-11-07 10:42:35,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 10:42:35,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-07 10:42:35,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 10:42:35,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-11-07 10:42:35,998 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-11-07 10:42:35,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:42:35,998 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-11-07 10:42:35,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-07 10:42:35,999 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-11-07 10:42:36,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 10:42:36,000 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:42:36,000 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:42:36,000 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:42:36,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:42:36,000 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-11-07 10:42:36,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:42:36,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:36,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:42:36,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:36,002 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:42:36,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:42:38,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:38,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:38,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:42:38,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:42:38,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:42:38,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:38,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:42:38,108 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:42:38,109 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:42:38,260 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-11-07 10:42:38,260 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:42:38,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:42:38,470 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:38,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:42:43,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:43,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:42:43,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-11-07 10:42:43,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:42:43,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-07 10:42:43,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-07 10:42:43,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 10:42:43,579 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-11-07 10:42:43,847 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-11-07 10:42:43,996 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-11-07 10:42:44,167 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-11-07 10:42:44,339 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:42:44,509 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:42:44,683 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:42:44,854 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:42:45,029 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:42:45,199 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:42:45,371 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:42:45,573 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:42:45,767 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:42:45,965 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:42:46,142 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:42:46,321 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:42:52,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:42:52,998 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-11-07 10:42:53,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-07 10:42:53,001 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-11-07 10:42:53,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:42:53,003 INFO L225 Difference]: With dead ends: 201 [2018-11-07 10:42:53,003 INFO L226 Difference]: Without dead ends: 196 [2018-11-07 10:42:53,005 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-11-07 10:42:53,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-11-07 10:42:53,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-11-07 10:42:53,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-07 10:42:53,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-11-07 10:42:53,014 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-11-07 10:42:53,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:42:53,015 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-11-07 10:42:53,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-07 10:42:53,015 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-11-07 10:42:53,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-07 10:42:53,016 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:42:53,016 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:42:53,016 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:42:53,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:42:53,017 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-11-07 10:42:53,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:42:53,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:53,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:42:53,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:42:53,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:42:53,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:42:55,595 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:55,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:55,595 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:42:55,595 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:42:55,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:42:55,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:42:55,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:42:55,617 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:42:55,617 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:42:55,789 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:42:55,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:42:55,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:42:56,207 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:42:56,207 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:43:01,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:01,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:43:01,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-11-07 10:43:01,816 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:43:01,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 10:43:01,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 10:43:01,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 10:43:01,818 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-11-07 10:43:02,044 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-11-07 10:43:02,196 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-11-07 10:43:02,373 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-11-07 10:43:02,541 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 10:43:02,722 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 10:43:02,900 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 10:43:03,081 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:43:03,267 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:43:03,454 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:43:03,632 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:43:03,815 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:43:04,000 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:43:04,179 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:43:04,356 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:43:04,542 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:43:04,728 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:43:05,174 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:43:06,144 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-11-07 10:43:12,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:43:12,116 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-11-07 10:43:12,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 10:43:12,116 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-11-07 10:43:12,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:43:12,118 INFO L225 Difference]: With dead ends: 210 [2018-11-07 10:43:12,118 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 10:43:12,120 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-11-07 10:43:12,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 10:43:12,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-11-07 10:43:12,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-11-07 10:43:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-11-07 10:43:12,128 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-11-07 10:43:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:43:12,128 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-11-07 10:43:12,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 10:43:12,128 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-11-07 10:43:12,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-07 10:43:12,129 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:43:12,129 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:43:12,130 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:43:12,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:43:12,130 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-11-07 10:43:12,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:43:12,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:12,131 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:43:12,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:12,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:43:12,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:43:14,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:14,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:43:14,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:43:14,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:43:14,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:43:14,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:43:14,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:43:14,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:43:14,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:43:15,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:43:15,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:43:15,402 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:15,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:43:21,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:21,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:43:21,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-11-07 10:43:21,405 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:43:21,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 10:43:21,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 10:43:21,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 10:43:21,406 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-11-07 10:43:21,752 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-11-07 10:43:21,901 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-11-07 10:43:22,079 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-11-07 10:43:22,254 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 10:43:22,438 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 10:43:22,624 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 10:43:22,816 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 10:43:23,011 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 10:43:23,201 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 10:43:23,390 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:43:23,586 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:43:23,783 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:43:23,978 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:43:24,183 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:43:24,389 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:43:24,586 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:43:24,780 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:43:24,976 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:43:25,172 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:43:25,378 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:43:28,616 WARN L179 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-11-07 10:43:32,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:43:32,977 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-11-07 10:43:32,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-07 10:43:32,977 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-11-07 10:43:32,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:43:32,979 INFO L225 Difference]: With dead ends: 219 [2018-11-07 10:43:32,979 INFO L226 Difference]: Without dead ends: 214 [2018-11-07 10:43:32,980 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-11-07 10:43:32,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-11-07 10:43:32,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-11-07 10:43:32,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-11-07 10:43:32,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-11-07 10:43:32,989 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-11-07 10:43:32,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:43:32,990 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-11-07 10:43:32,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 10:43:32,990 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-11-07 10:43:32,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-11-07 10:43:32,991 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:43:32,991 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:43:32,992 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:43:32,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:43:32,992 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-11-07 10:43:32,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:43:32,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:32,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:43:32,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:32,993 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:43:33,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:43:35,693 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:35,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:43:35,694 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:43:35,694 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:43:35,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:43:35,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:43:35,694 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:43:35,702 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:43:35,702 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:43:36,411 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-11-07 10:43:36,411 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:43:36,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:43:36,676 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:36,676 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:43:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:43:43,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:43:43,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-11-07 10:43:43,626 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:43:43,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-11-07 10:43:43,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-11-07 10:43:43,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 10:43:43,628 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-11-07 10:43:44,404 WARN L179 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-11-07 10:43:44,567 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-11-07 10:43:44,756 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-11-07 10:43:44,954 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 10:43:45,149 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 10:43:45,346 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 10:43:45,544 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 10:43:45,746 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 10:43:45,946 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 10:43:46,152 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 10:43:46,361 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 10:43:46,567 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 10:43:46,772 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:43:47,009 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:43:47,254 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:43:47,463 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:43:47,668 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:43:47,880 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:43:48,089 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:43:48,304 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:43:49,454 WARN L179 SmtUtils]: Spent 591.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:43:49,680 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:43:49,891 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:43:58,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:43:58,090 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-11-07 10:43:58,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 10:43:58,092 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-11-07 10:43:58,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:43:58,094 INFO L225 Difference]: With dead ends: 228 [2018-11-07 10:43:58,094 INFO L226 Difference]: Without dead ends: 223 [2018-11-07 10:43:58,096 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-11-07 10:43:58,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-11-07 10:43:58,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-11-07 10:43:58,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-11-07 10:43:58,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-11-07 10:43:58,105 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-11-07 10:43:58,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:43:58,106 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-11-07 10:43:58,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-11-07 10:43:58,106 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-11-07 10:43:58,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-11-07 10:43:58,107 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:43:58,107 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:43:58,107 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:43:58,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:43:58,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-11-07 10:43:58,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:43:58,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:58,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:43:58,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:43:58,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:43:58,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:44:01,364 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:01,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:44:01,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:44:01,364 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:44:01,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:44:01,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:44:01,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:44:01,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:44:01,375 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:44:01,637 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:44:01,637 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:44:01,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:44:02,122 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:02,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:44:09,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:09,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:44:09,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-11-07 10:44:09,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:44:09,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 10:44:09,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 10:44:09,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 10:44:09,478 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-11-07 10:44:09,806 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-11-07 10:44:09,981 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-11-07 10:44:10,186 WARN L179 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-11-07 10:44:10,393 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 10:44:10,602 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 10:44:10,813 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 10:44:11,031 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 10:44:11,244 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 10:44:11,464 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 10:44:11,679 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 10:44:11,902 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 10:44:12,125 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 10:44:12,352 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 10:44:12,577 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 10:44:12,818 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 10:44:13,051 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:44:13,273 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:44:13,495 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:44:13,718 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:44:13,944 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:44:14,177 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:44:14,424 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:44:14,650 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:44:14,876 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:44:15,102 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:44:23,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:44:23,584 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-11-07 10:44:23,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-11-07 10:44:23,584 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-11-07 10:44:23,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:44:23,586 INFO L225 Difference]: With dead ends: 237 [2018-11-07 10:44:23,587 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 10:44:23,589 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-11-07 10:44:23,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 10:44:23,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-11-07 10:44:23,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 10:44:23,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-11-07 10:44:23,598 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-11-07 10:44:23,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:44:23,599 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-11-07 10:44:23,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-07 10:44:23,599 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-11-07 10:44:23,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-07 10:44:23,601 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:44:23,601 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:44:23,601 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:44:23,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:44:23,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-11-07 10:44:23,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:44:23,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:44:23,602 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:44:23,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:44:23,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:44:24,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:44:27,658 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:27,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:44:27,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:44:27,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:44:27,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:44:27,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:44:27,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 10:44:27,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:44:27,667 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:44:28,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:44:28,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:44:28,495 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:28,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:44:36,109 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:44:36,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:44:36,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-11-07 10:44:36,129 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:44:36,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-11-07 10:44:36,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-11-07 10:44:36,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-11-07 10:44:36,132 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-11-07 10:44:36,412 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-11-07 10:44:36,609 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-11-07 10:44:36,840 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-11-07 10:44:37,075 WARN L179 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-11-07 10:44:37,334 WARN L179 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-11-07 10:44:37,571 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-11-07 10:44:37,812 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 10:44:38,051 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 10:44:38,313 WARN L179 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 10:44:38,585 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 10:44:38,838 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 10:44:39,087 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 10:44:39,343 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 10:44:39,705 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 10:44:39,961 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 10:44:40,255 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 10:44:40,520 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 10:44:40,777 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 10:44:41,035 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 10:44:41,295 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 10:44:41,552 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 10:44:41,810 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 10:44:42,074 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 10:44:42,332 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 10:44:42,588 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 10:44:42,841 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 10:44:43,110 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 10:44:43,372 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 10:44:43,657 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 10:44:43,909 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 10:44:44,161 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 10:44:44,424 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 Received shutdown request... [2018-11-07 10:44:48,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 10:44:48,562 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 10:44:48,567 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 10:44:48,567 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:44:48 BoogieIcfgContainer [2018-11-07 10:44:48,567 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 10:44:48,568 INFO L168 Benchmark]: Toolchain (without parser) took 248131.27 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 778.0 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -153.8 MB). Peak memory consumption was 624.3 MB. Max. memory is 7.1 GB. [2018-11-07 10:44:48,569 INFO L168 Benchmark]: CDTParser took 0.24 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. [2018-11-07 10:44:48,569 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.18 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. [2018-11-07 10:44:48,570 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.76 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. [2018-11-07 10:44:48,570 INFO L168 Benchmark]: Boogie Preprocessor took 24.27 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. [2018-11-07 10:44:48,570 INFO L168 Benchmark]: RCFGBuilder took 437.38 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 10:44:48,571 INFO L168 Benchmark]: TraceAbstraction took 247362.55 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 19.9 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 644.9 MB). Peak memory consumption was 664.9 MB. Max. memory is 7.1 GB. [2018-11-07 10:44:48,573 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 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 277.18 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 23.76 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 24.27 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 437.38 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.3 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 247362.55 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 19.9 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 644.9 MB). Peak memory consumption was 664.9 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 51 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 201 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 247.2s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 128.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3963 SDslu, 8695 SDs, 0 SdLazy, 4087 SolverSat, 2459 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8107 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2902 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29277 ImplicationChecksByTransitivity, 224.7s 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, 0.2s 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, 5.8s SatisfiabilityAnalysisTime, 110.1s 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