java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:14:03,583 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:14:03,585 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:14:03,598 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:14:03,598 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:14:03,599 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:14:03,600 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:14:03,602 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:14:03,604 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:14:03,605 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:14:03,605 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:14:03,606 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:14:03,607 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:14:03,608 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:14:03,609 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:14:03,610 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:14:03,611 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:14:03,612 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:14:03,614 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:14:03,616 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:14:03,618 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:14:03,619 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:14:03,622 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:14:03,622 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:14:03,622 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:14:03,625 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:14:03,626 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:14:03,627 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:14:03,628 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:14:03,629 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:14:03,629 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:14:03,631 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 04:14:03,631 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 04:14:03,631 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 04:14:03,633 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 04:14:03,633 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 04:14:03,633 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:14:03,653 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:14:03,653 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:14:03,654 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:14:03,654 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:14:03,655 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:14:03,655 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:14:03,655 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:14:03,655 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:14:03,655 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:14:03,656 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:14:03,656 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:14:03,656 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:14:03,657 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:14:03,657 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:14:03,657 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:14:03,657 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:14:03,657 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:14:03,658 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:14:03,658 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:14:03,658 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:14:03,658 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:14:03,658 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:14:03,658 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:14:03,659 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:14:03,659 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:14:03,659 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:14:03,659 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:14:03,659 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:14:03,660 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:14:03,660 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:14:03,660 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:14:03,660 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:14:03,660 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:14:03,661 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:14:03,710 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:14:03,728 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:14:03,733 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:14:03,734 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:14:03,735 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:14:03,735 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-27 04:14:03,798 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3029e7d9f/7e0301b7871f4acba6a2156f2daa6fb5/FLAG6112b400a [2018-10-27 04:14:04,239 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:14:04,240 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-27 04:14:04,248 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3029e7d9f/7e0301b7871f4acba6a2156f2daa6fb5/FLAG6112b400a [2018-10-27 04:14:04,267 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3029e7d9f/7e0301b7871f4acba6a2156f2daa6fb5 [2018-10-27 04:14:04,280 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:14:04,282 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:14:04,283 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:14:04,284 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:14:04,289 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:14:04,290 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,292 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73054737 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04, skipping insertion in model container [2018-10-27 04:14:04,292 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,303 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:14:04,330 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:14:04,507 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:14:04,512 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:14:04,534 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:14:04,554 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:14:04,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04 WrapperNode [2018-10-27 04:14:04,554 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:14:04,555 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:14:04,555 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:14:04,556 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:14:04,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,572 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,579 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:14:04,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:14:04,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:14:04,579 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:14:04,590 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,591 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,591 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,603 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,605 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,607 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:14:04,607 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:14:04,608 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:14:04,608 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:14:04,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:14:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:14:04,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:14:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:14:04,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:14:04,670 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:14:04,670 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:14:04,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:14:04,670 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:14:04,960 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:14:04,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:14:04 BoogieIcfgContainer [2018-10-27 04:14:04,961 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:14:04,962 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:14:04,962 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:14:04,965 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:14:04,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:14:04" (1/3) ... [2018-10-27 04:14:04,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f7dad39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:14:04, skipping insertion in model container [2018-10-27 04:14:04,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (2/3) ... [2018-10-27 04:14:04,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f7dad39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:14:04, skipping insertion in model container [2018-10-27 04:14:04,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:14:04" (3/3) ... [2018-10-27 04:14:04,972 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-10-27 04:14:04,997 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:14:05,021 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:14:05,044 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:14:05,083 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:14:05,083 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:14:05,083 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:14:05,083 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:14:05,084 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:14:05,084 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:14:05,084 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:14:05,084 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:14:05,105 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-27 04:14:05,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:14:05,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,113 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,115 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-10-27 04:14:05,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:05,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:05,236 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:14:05,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:14:05,237 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:14:05,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:14:05,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:14:05,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:14:05,258 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-27 04:14:05,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:05,283 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-27 04:14:05,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:14:05,284 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-27 04:14:05,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:05,294 INFO L225 Difference]: With dead ends: 33 [2018-10-27 04:14:05,295 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 04:14:05,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:14:05,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 04:14:05,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 04:14:05,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 04:14:05,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 04:14:05,339 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 04:14:05,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:05,339 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 04:14:05,340 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:14:05,340 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 04:14:05,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-27 04:14:05,341 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,341 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,341 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,342 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-10-27 04:14:05,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,344 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:05,539 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 5 [2018-10-27 04:14:05,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:05,750 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:14:05,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-27 04:14:05,751 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:14:05,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:14:05,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:14:05,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:14:05,754 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-27 04:14:05,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:05,890 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 04:14:05,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:14:05,890 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-10-27 04:14:05,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:05,891 INFO L225 Difference]: With dead ends: 21 [2018-10-27 04:14:05,892 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 04:14:05,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-27 04:14:05,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 04:14:05,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 04:14:05,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 04:14:05,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 04:14:05,899 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-10-27 04:14:05,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:05,899 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 04:14:05,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:14:05,900 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 04:14:05,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 04:14:05,901 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,901 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,901 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-10-27 04:14:05,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:06,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:06,021 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-27 04:14:06,023 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 04:14:06,076 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:14:06,076 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:14:06,392 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:14:06,394 INFO L272 AbstractInterpreter]: Visited 14 different actions 102 times. Merged at 4 different actions 44 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 04:14:06,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:06,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:14:06,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:06,405 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:06,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:06,426 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:06,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:06,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:06,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:06,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:06,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 04:14:06,888 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:06,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:14:06,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:14:06,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:14:06,890 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-27 04:14:07,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:07,055 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-27 04:14:07,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:14:07,056 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-27 04:14:07,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:07,057 INFO L225 Difference]: With dead ends: 30 [2018-10-27 04:14:07,057 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 04:14:07,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:14:07,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 04:14:07,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-27 04:14:07,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 04:14:07,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-27 04:14:07,064 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-10-27 04:14:07,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:07,065 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-27 04:14:07,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:14:07,065 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-27 04:14:07,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 04:14:07,066 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:07,066 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:07,066 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:07,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:07,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-10-27 04:14:07,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:07,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:07,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:07,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:07,068 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:07,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:07,339 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:07,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:07,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:07,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:07,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:07,341 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:07,357 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:07,357 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:07,402 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 04:14:07,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:07,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:07,581 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:07,942 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:07,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:14:07,979 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:07,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:14:07,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:14:07,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:14:07,980 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-10-27 04:14:08,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:08,483 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-27 04:14:08,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:14:08,484 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-27 04:14:08,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:08,486 INFO L225 Difference]: With dead ends: 39 [2018-10-27 04:14:08,486 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 04:14:08,487 INFO L605 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 [2018-10-27 04:14:08,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 04:14:08,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 04:14:08,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 04:14:08,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 04:14:08,495 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-10-27 04:14:08,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:08,495 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 04:14:08,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:14:08,496 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 04:14:08,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 04:14:08,497 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:08,497 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:08,497 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:08,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:08,498 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-10-27 04:14:08,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:08,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:08,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,499 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:08,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,669 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:08,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:08,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:08,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,670 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:08,678 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:08,678 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:08,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:08,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:08,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:08,815 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:09,126 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:09,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:09,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:14:09,147 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:09,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:14:09,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:14:09,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:14:09,148 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-10-27 04:14:09,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:09,486 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-10-27 04:14:09,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:14:09,498 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-27 04:14:09,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:09,499 INFO L225 Difference]: With dead ends: 48 [2018-10-27 04:14:09,500 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 04:14:09,501 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-10-27 04:14:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 04:14:09,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-27 04:14:09,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 04:14:09,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-27 04:14:09,514 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-10-27 04:14:09,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:09,518 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-27 04:14:09,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:14:09,518 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-27 04:14:09,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-27 04:14:09,519 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:09,520 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:09,520 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:09,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:09,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-10-27 04:14:09,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:09,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:09,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:09,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:10,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:10,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:10,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:10,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:10,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:10,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:10,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:10,532 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:11,011 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:11,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:11,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 04:14:11,033 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:11,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:14:11,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:14:11,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:14:11,034 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-10-27 04:14:11,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:11,533 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-27 04:14:11,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:14:11,535 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-27 04:14:11,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:11,536 INFO L225 Difference]: With dead ends: 57 [2018-10-27 04:14:11,537 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 04:14:11,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:14:11,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 04:14:11,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 04:14:11,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 04:14:11,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 04:14:11,547 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-10-27 04:14:11,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:11,548 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 04:14:11,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:14:11,548 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 04:14:11,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 04:14:11,549 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:11,550 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:11,550 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:11,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:11,550 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-10-27 04:14:11,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:11,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:11,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:11,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:11,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:11,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:12,068 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:12,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:12,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:12,069 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:12,069 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:12,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:12,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:12,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:12,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:12,101 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 04:14:12,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:12,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:12,400 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:12,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:13,156 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:13,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:13,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 04:14:13,178 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:13,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:14:13,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:14:13,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:14:13,181 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-10-27 04:14:13,981 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 11 [2018-10-27 04:14:14,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:14,245 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-10-27 04:14:14,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:14:14,247 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-10-27 04:14:14,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:14,249 INFO L225 Difference]: With dead ends: 66 [2018-10-27 04:14:14,249 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 04:14:14,251 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 04:14:14,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 04:14:14,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-27 04:14:14,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-27 04:14:14,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-27 04:14:14,259 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-10-27 04:14:14,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:14,260 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-27 04:14:14,260 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:14:14,260 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-27 04:14:14,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 04:14:14,262 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:14,262 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:14,262 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:14,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:14,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-10-27 04:14:14,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:14,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:14,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:14,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:14,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:14,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:14,950 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:14,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:14,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:14,950 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:14,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:14,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:14,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-27 04:14:14,963 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:14,964 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:14,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:14,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:14,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:15,101 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:15,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:15,897 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:15,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:15,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 04:14:15,921 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:15,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:14:15,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:14:15,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:14:15,922 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-10-27 04:14:16,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:16,810 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-10-27 04:14:16,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:14:16,811 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-10-27 04:14:16,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:16,812 INFO L225 Difference]: With dead ends: 75 [2018-10-27 04:14:16,812 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 04:14:16,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 04:14:16,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 04:14:16,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-27 04:14:16,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 04:14:16,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-27 04:14:16,822 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-10-27 04:14:16,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:16,822 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-27 04:14:16,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:14:16,822 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-27 04:14:16,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 04:14:16,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:16,824 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:16,824 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:16,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:16,824 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-10-27 04:14:16,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:16,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:16,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:16,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:16,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:16,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:17,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:17,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:17,193 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:17,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:17,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:17,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:17,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:17,202 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:17,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:17,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:17,335 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:17,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:18,587 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:18,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:18,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 04:14:18,608 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:18,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 04:14:18,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 04:14:18,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:14:18,610 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-10-27 04:14:19,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:19,877 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-10-27 04:14:19,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:14:19,879 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-27 04:14:19,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:19,881 INFO L225 Difference]: With dead ends: 84 [2018-10-27 04:14:19,881 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 04:14:19,883 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 04:14:19,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 04:14:19,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-27 04:14:19,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 04:14:19,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-10-27 04:14:19,894 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-10-27 04:14:19,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:19,894 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-10-27 04:14:19,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 04:14:19,894 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-10-27 04:14:19,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-27 04:14:19,896 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:19,896 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:19,896 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:19,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:19,897 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-10-27 04:14:19,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:19,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:19,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:19,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:19,898 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:19,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:20,419 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:20,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:20,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:20,420 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:20,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:20,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:20,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:20,429 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:20,430 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:20,469 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-27 04:14:20,470 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:20,477 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:20,597 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:20,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:21,440 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:21,462 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:21,462 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 04:14:21,462 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:21,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 04:14:21,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 04:14:21,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 04:14:21,464 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-10-27 04:14:23,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:23,086 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-10-27 04:14:23,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 04:14:23,093 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-10-27 04:14:23,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:23,094 INFO L225 Difference]: With dead ends: 93 [2018-10-27 04:14:23,094 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 04:14:23,098 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 04:14:23,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 04:14:23,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-27 04:14:23,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-27 04:14:23,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-10-27 04:14:23,108 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-10-27 04:14:23,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:23,109 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-10-27 04:14:23,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 04:14:23,109 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-10-27 04:14:23,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-27 04:14:23,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:23,111 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:23,111 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:23,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:23,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-10-27 04:14:23,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:23,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:23,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:23,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:23,113 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:23,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:24,018 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:24,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:24,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:24,019 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:24,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:24,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:24,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:24,028 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:24,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:24,056 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:24,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:24,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:24,167 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:24,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:25,276 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:25,276 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 04:14:25,277 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:25,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 04:14:25,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 04:14:25,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 04:14:25,279 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-10-27 04:14:26,079 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-10-27 04:14:27,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:27,366 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-10-27 04:14:27,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 04:14:27,371 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-10-27 04:14:27,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:27,372 INFO L225 Difference]: With dead ends: 102 [2018-10-27 04:14:27,372 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 04:14:27,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 04:14:27,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 04:14:27,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-27 04:14:27,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 04:14:27,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-10-27 04:14:27,389 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-10-27 04:14:27,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:27,389 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-10-27 04:14:27,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 04:14:27,390 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-10-27 04:14:27,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 04:14:27,392 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:27,392 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:27,392 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:27,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:27,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-10-27 04:14:27,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:27,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:27,397 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:27,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:27,397 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:27,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:28,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:28,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:28,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:28,336 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:28,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:28,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:28,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:28,345 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:28,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:28,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:28,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:28,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:29,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:29,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:29,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 04:14:29,839 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:29,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 04:14:29,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 04:14:29,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 04:14:29,841 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-10-27 04:14:32,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:32,156 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-10-27 04:14:32,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 04:14:32,156 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-10-27 04:14:32,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:32,158 INFO L225 Difference]: With dead ends: 111 [2018-10-27 04:14:32,158 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 04:14:32,161 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 04:14:32,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 04:14:32,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-27 04:14:32,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-27 04:14:32,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-10-27 04:14:32,170 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-10-27 04:14:32,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:32,171 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-10-27 04:14:32,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 04:14:32,171 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-10-27 04:14:32,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-27 04:14:32,173 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:32,173 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:32,173 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:32,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:32,174 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-10-27 04:14:32,174 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:32,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:32,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:32,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:32,175 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:32,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:33,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:33,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:33,813 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:33,813 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:33,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:33,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:33,813 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:33,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:33,821 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:33,873 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 04:14:33,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:33,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:34,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:34,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:35,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:35,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:35,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 04:14:35,563 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:35,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 04:14:35,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 04:14:35,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 04:14:35,566 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-10-27 04:14:35,815 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-10-27 04:14:38,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:38,245 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-10-27 04:14:38,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 04:14:38,245 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-10-27 04:14:38,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:38,246 INFO L225 Difference]: With dead ends: 120 [2018-10-27 04:14:38,246 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 04:14:38,250 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 04:14:38,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 04:14:38,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-27 04:14:38,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 04:14:38,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-10-27 04:14:38,257 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-10-27 04:14:38,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:38,257 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-10-27 04:14:38,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 04:14:38,258 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-10-27 04:14:38,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 04:14:38,261 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:38,261 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:38,261 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:38,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:38,262 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-10-27 04:14:38,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:38,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:38,262 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:38,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:38,263 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:38,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:39,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:39,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:39,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:39,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:39,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:39,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:39,184 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:39,184 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:39,249 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:39,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:39,278 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:39,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:39,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:42,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:42,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:42,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 04:14:42,300 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:42,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 04:14:42,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 04:14:42,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 04:14:42,302 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-10-27 04:14:45,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:45,401 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-10-27 04:14:45,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 04:14:45,401 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-10-27 04:14:45,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:45,402 INFO L225 Difference]: With dead ends: 129 [2018-10-27 04:14:45,402 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 04:14:45,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 04:14:45,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 04:14:45,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-27 04:14:45,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-27 04:14:45,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-10-27 04:14:45,411 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-10-27 04:14:45,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:45,412 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-10-27 04:14:45,412 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 04:14:45,412 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-10-27 04:14:45,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-27 04:14:45,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:45,415 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:45,416 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:45,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:45,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-10-27 04:14:45,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:45,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:45,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:45,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:45,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:45,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:46,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:46,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:46,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:46,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:46,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:46,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:46,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:46,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:46,395 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:46,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:46,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:46,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:46,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:49,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:49,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:49,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 04:14:49,227 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:49,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 04:14:49,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 04:14:49,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 04:14:49,228 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-10-27 04:14:53,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:53,146 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-10-27 04:14:53,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 04:14:53,147 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-10-27 04:14:53,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:53,148 INFO L225 Difference]: With dead ends: 138 [2018-10-27 04:14:53,148 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 04:14:53,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 04:14:53,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 04:14:53,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-27 04:14:53,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-27 04:14:53,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-10-27 04:14:53,157 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-10-27 04:14:53,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:53,157 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-10-27 04:14:53,157 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 04:14:53,158 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-10-27 04:14:53,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-27 04:14:53,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:53,159 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:53,159 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:53,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:53,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-10-27 04:14:53,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:53,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:53,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:53,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:53,161 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:53,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:54,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:54,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:54,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:54,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:54,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:54,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:54,473 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:54,480 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:54,481 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:54,523 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-27 04:14:54,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:54,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:54,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:57,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:57,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:57,171 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 04:14:57,171 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:57,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 04:14:57,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 04:14:57,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 04:14:57,172 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-10-27 04:15:01,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:01,574 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-27 04:15:01,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 04:15:01,574 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-10-27 04:15:01,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:01,575 INFO L225 Difference]: With dead ends: 147 [2018-10-27 04:15:01,576 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 04:15:01,577 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 04:15:01,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 04:15:01,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-27 04:15:01,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-27 04:15:01,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-10-27 04:15:01,585 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-10-27 04:15:01,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:01,585 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-10-27 04:15:01,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 04:15:01,586 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-10-27 04:15:01,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-10-27 04:15:01,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:01,587 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:01,587 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:01,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:01,588 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-10-27 04:15:01,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:01,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:01,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:01,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:01,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:01,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:02,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:02,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:02,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:02,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:02,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:02,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:02,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:02,774 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:02,774 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:02,817 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:02,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:02,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:02,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:02,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:06,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:06,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:06,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 04:15:06,079 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:06,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 04:15:06,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 04:15:06,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 04:15:06,081 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-10-27 04:15:11,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:11,216 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-10-27 04:15:11,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 04:15:11,216 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-10-27 04:15:11,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:11,218 INFO L225 Difference]: With dead ends: 156 [2018-10-27 04:15:11,218 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 04:15:11,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-10-27 04:15:11,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 04:15:11,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-27 04:15:11,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-27 04:15:11,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-10-27 04:15:11,226 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-10-27 04:15:11,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:11,226 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-10-27 04:15:11,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 04:15:11,227 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-10-27 04:15:11,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 04:15:11,228 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:11,228 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:11,228 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:11,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:11,229 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-10-27 04:15:11,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:11,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:11,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:11,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:11,230 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:11,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:12,556 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:12,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:12,556 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:12,556 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:12,556 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:12,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:12,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:12,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:12,565 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:12,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:12,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:13,155 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:13,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:16,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:16,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:16,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 04:15:16,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:16,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 04:15:16,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 04:15:16,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 04:15:16,545 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-10-27 04:15:16,816 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 8 [2018-10-27 04:15:16,960 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-10-27 04:15:17,088 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:15:17,224 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:15:22,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:22,737 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-10-27 04:15:22,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 04:15:22,738 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-10-27 04:15:22,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:22,742 INFO L225 Difference]: With dead ends: 165 [2018-10-27 04:15:22,742 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 04:15:22,744 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 04:15:22,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 04:15:22,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-10-27 04:15:22,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-27 04:15:22,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-10-27 04:15:22,751 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-10-27 04:15:22,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:22,751 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-10-27 04:15:22,751 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 04:15:22,751 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-10-27 04:15:22,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-27 04:15:22,752 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:22,752 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:22,752 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:22,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:22,753 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-10-27 04:15:22,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:22,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:22,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:22,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:22,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:22,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:24,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:24,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:24,843 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:24,843 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:24,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:24,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:24,852 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:24,852 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:24,908 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-27 04:15:24,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:24,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:25,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:25,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:28,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:28,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:28,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 04:15:28,791 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:28,792 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 04:15:28,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 04:15:28,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 04:15:28,793 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-10-27 04:15:28,964 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-10-27 04:15:29,080 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 150 DAG size of output: 8 [2018-10-27 04:15:29,214 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-10-27 04:15:29,354 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:15:29,516 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:15:29,674 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:15:29,827 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:15:29,978 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:15:35,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:35,730 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-10-27 04:15:35,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 04:15:35,734 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-10-27 04:15:35,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:35,735 INFO L225 Difference]: With dead ends: 174 [2018-10-27 04:15:35,736 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 04:15:35,737 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-10-27 04:15:35,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 04:15:35,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-27 04:15:35,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 04:15:35,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-10-27 04:15:35,744 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-10-27 04:15:35,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:35,745 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-10-27 04:15:35,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 04:15:35,745 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-10-27 04:15:35,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-27 04:15:35,746 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:35,746 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:35,746 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:35,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:35,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-10-27 04:15:35,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:35,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:35,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:35,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:35,748 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:35,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:37,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:37,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:37,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:37,427 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:37,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:37,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:37,428 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:37,436 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:37,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:37,547 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:37,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:37,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:37,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:37,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:42,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:42,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:42,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 04:15:42,058 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:42,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 04:15:42,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 04:15:42,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 04:15:42,060 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-10-27 04:15:42,241 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-10-27 04:15:42,371 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-10-27 04:15:42,528 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-10-27 04:15:42,676 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:15:42,833 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:15:42,990 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:15:43,146 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:15:43,301 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:15:43,455 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:15:43,777 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:15:50,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:50,142 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-10-27 04:15:50,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 04:15:50,143 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-10-27 04:15:50,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:50,144 INFO L225 Difference]: With dead ends: 183 [2018-10-27 04:15:50,144 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 04:15:50,145 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-10-27 04:15:50,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 04:15:50,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-10-27 04:15:50,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-27 04:15:50,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-10-27 04:15:50,153 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-10-27 04:15:50,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:50,154 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-10-27 04:15:50,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 04:15:50,154 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-10-27 04:15:50,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-27 04:15:50,155 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:50,155 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:50,155 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:50,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:50,156 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-10-27 04:15:50,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:50,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:50,157 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:50,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:50,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:50,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:52,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:52,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:52,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:52,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:52,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:52,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:52,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:52,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:52,114 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:52,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:52,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:52,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:52,830 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:57,409 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:57,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:57,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 04:15:57,430 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:57,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 04:15:57,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 04:15:57,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 04:15:57,432 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-10-27 04:15:57,645 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-10-27 04:15:57,784 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-10-27 04:15:57,942 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-10-27 04:15:58,102 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:15:58,268 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:15:58,436 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:15:58,602 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:15:58,779 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:15:58,959 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:15:59,137 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:15:59,320 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:15:59,503 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:15:59,855 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:16:00,037 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-27 04:16:06,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:06,352 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-10-27 04:16:06,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 04:16:06,353 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-10-27 04:16:06,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:06,354 INFO L225 Difference]: With dead ends: 192 [2018-10-27 04:16:06,354 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 04:16:06,356 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-10-27 04:16:06,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 04:16:06,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-27 04:16:06,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 04:16:06,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-10-27 04:16:06,364 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-10-27 04:16:06,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:06,365 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-10-27 04:16:06,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 04:16:06,365 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-10-27 04:16:06,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 04:16:06,366 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:06,366 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:06,367 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:06,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:06,367 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-10-27 04:16:06,367 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:06,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:06,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:06,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:06,368 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:06,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:08,514 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:08,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:08,514 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:08,514 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:08,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:08,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:08,515 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:08,534 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:16:08,534 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:16:08,664 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-10-27 04:16:08,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:08,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:08,868 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:08,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:13,853 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:13,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:13,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 04:16:13,884 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:13,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 04:16:13,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 04:16:13,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 04:16:13,886 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-10-27 04:16:14,149 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-10-27 04:16:14,296 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-10-27 04:16:14,466 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-10-27 04:16:14,636 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 04:16:14,811 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 04:16:14,994 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 04:16:15,177 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:16:15,366 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:16:15,558 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:16:15,747 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:16:15,946 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:16:16,150 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:16:16,344 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:16:16,530 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:16:16,728 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:16:16,938 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:16:24,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:24,049 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-10-27 04:16:24,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 04:16:24,050 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-10-27 04:16:24,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:24,052 INFO L225 Difference]: With dead ends: 201 [2018-10-27 04:16:24,052 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 04:16:24,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-10-27 04:16:24,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 04:16:24,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-10-27 04:16:24,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-27 04:16:24,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-10-27 04:16:24,061 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-10-27 04:16:24,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:24,061 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-10-27 04:16:24,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 04:16:24,061 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-10-27 04:16:24,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-27 04:16:24,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:24,063 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:24,063 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:24,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:24,063 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-10-27 04:16:24,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:24,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:24,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:24,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:24,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:24,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:26,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:26,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:26,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:26,562 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:26,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:26,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:26,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:26,570 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:16:26,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:16:26,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:16:26,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:26,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:27,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:27,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:32,617 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:32,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:32,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 04:16:32,639 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:32,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 04:16:32,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 04:16:32,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 04:16:32,641 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-10-27 04:16:32,867 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-10-27 04:16:33,028 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-10-27 04:16:33,211 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-10-27 04:16:33,399 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 04:16:33,597 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 04:16:33,791 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 04:16:33,984 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 04:16:34,183 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 04:16:34,379 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 04:16:34,585 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:16:34,798 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:16:35,018 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:16:35,238 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:16:35,453 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:16:35,671 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:16:35,897 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:16:36,112 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:16:36,427 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:16:36,636 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:16:36,845 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:16:44,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:44,048 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-10-27 04:16:44,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 04:16:44,049 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-10-27 04:16:44,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:44,051 INFO L225 Difference]: With dead ends: 210 [2018-10-27 04:16:44,051 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 04:16:44,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-10-27 04:16:44,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 04:16:44,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-10-27 04:16:44,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-27 04:16:44,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-10-27 04:16:44,059 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-10-27 04:16:44,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:44,060 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-10-27 04:16:44,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 04:16:44,060 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-10-27 04:16:44,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 04:16:44,061 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:44,061 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:44,061 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:44,061 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:44,061 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-10-27 04:16:44,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:44,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:44,062 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:44,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:44,062 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:44,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:46,744 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:46,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:46,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:46,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:46,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:46,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:46,745 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:46,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:46,754 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:16:47,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:47,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:47,693 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:47,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:53,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:53,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:53,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 04:16:53,542 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:53,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 04:16:53,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 04:16:53,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 04:16:53,543 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-10-27 04:16:53,786 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-10-27 04:16:53,960 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-10-27 04:16:54,151 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-10-27 04:16:54,341 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 04:16:54,537 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 04:16:54,733 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 04:16:54,956 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 04:16:55,177 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 04:16:55,394 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 04:16:55,619 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 04:16:55,844 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 04:16:56,067 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 04:16:56,285 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:16:56,507 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:16:56,751 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:16:56,981 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:16:57,208 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:16:57,440 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:16:57,668 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:16:57,902 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:16:58,139 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:16:58,360 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:16:58,593 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 04:16:58,820 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-27 04:16:59,053 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-10-27 04:17:01,492 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-10-27 04:17:06,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:06,334 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-10-27 04:17:06,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 04:17:06,334 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-10-27 04:17:06,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:06,336 INFO L225 Difference]: With dead ends: 219 [2018-10-27 04:17:06,336 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 04:17:06,338 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-10-27 04:17:06,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 04:17:06,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-10-27 04:17:06,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-27 04:17:06,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-10-27 04:17:06,347 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-10-27 04:17:06,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:06,347 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-10-27 04:17:06,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 04:17:06,348 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-10-27 04:17:06,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-27 04:17:06,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:06,349 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:06,349 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:06,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:06,350 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-10-27 04:17:06,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:06,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:06,351 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:06,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:06,351 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:06,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:08,986 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:08,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:08,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:08,987 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:08,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:08,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:08,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:08,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:17:08,995 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:17:09,130 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-10-27 04:17:09,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:09,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:09,384 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:09,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:15,779 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:15,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:15,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 04:17:15,801 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:15,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 04:17:15,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 04:17:15,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 04:17:15,803 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-10-27 04:17:16,581 WARN L179 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-10-27 04:17:16,759 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-10-27 04:17:16,960 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-10-27 04:17:17,155 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 04:17:17,364 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 04:17:17,572 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 04:17:17,790 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 04:17:18,013 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 04:17:18,227 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 04:17:18,448 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 04:17:18,678 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 04:17:18,904 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 04:17:19,123 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 04:17:19,359 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 04:17:19,594 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 04:17:19,825 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:17:20,126 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:17:20,363 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:17:20,593 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:17:20,971 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:17:21,209 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:17:21,446 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:17:21,683 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:17:21,916 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:17:22,162 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:17:30,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:30,261 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-10-27 04:17:30,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 04:17:30,264 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-10-27 04:17:30,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:30,265 INFO L225 Difference]: With dead ends: 228 [2018-10-27 04:17:30,266 INFO L226 Difference]: Without dead ends: 223 [2018-10-27 04:17:30,267 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-10-27 04:17:30,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-27 04:17:30,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-10-27 04:17:30,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-27 04:17:30,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-10-27 04:17:30,276 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-10-27 04:17:30,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:30,276 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-10-27 04:17:30,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 04:17:30,276 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-10-27 04:17:30,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 04:17:30,278 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:30,278 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:30,278 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:30,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:30,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-10-27 04:17:30,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:30,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:30,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:30,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:30,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:30,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:33,095 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:33,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:33,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:33,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:33,096 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:33,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:33,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:33,104 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:17:33,105 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:17:33,468 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:17:33,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:33,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:34,017 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:34,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:40,836 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:40,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:40,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-27 04:17:40,857 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:40,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-27 04:17:40,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-27 04:17:40,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 04:17:40,859 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-10-27 04:17:41,148 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-10-27 04:17:41,325 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-10-27 04:17:41,530 WARN L179 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-10-27 04:17:41,746 WARN L179 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-27 04:17:41,976 WARN L179 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-27 04:17:42,202 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-27 04:17:42,425 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 04:17:42,651 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 04:17:42,878 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 04:17:43,117 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 04:17:43,369 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 04:17:43,616 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 04:17:43,860 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 04:17:44,105 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 04:17:44,348 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 04:17:44,603 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 04:17:44,841 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 04:17:45,106 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 04:17:45,346 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 04:17:45,598 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 04:17:45,847 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 04:17:46,098 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 04:17:46,341 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 04:17:46,598 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 04:17:46,847 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 04:17:47,098 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 04:17:47,349 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 04:17:47,598 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 04:17:56,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:56,066 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-10-27 04:17:56,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-27 04:17:56,067 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-10-27 04:17:56,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:56,068 INFO L225 Difference]: With dead ends: 237 [2018-10-27 04:17:56,069 INFO L226 Difference]: Without dead ends: 232 [2018-10-27 04:17:56,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-10-27 04:17:56,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-27 04:17:56,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-10-27 04:17:56,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-10-27 04:17:56,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-10-27 04:17:56,079 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-10-27 04:17:56,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:56,080 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-10-27 04:17:56,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-27 04:17:56,080 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-10-27 04:17:56,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-10-27 04:17:56,081 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:56,082 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:56,082 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:56,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:56,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-10-27 04:17:56,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:56,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:56,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:56,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:56,083 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:56,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:18:00,584 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:18:00,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:18:00,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:18:00,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:18:00,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:18:00,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:18:00,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:18:00,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:18:00,592 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:18:01,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:18:01,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:18:01,730 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:18:01,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:18:09,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:18:09,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:18:09,063 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-10-27 04:18:09,063 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:18:09,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-27 04:18:09,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-27 04:18:09,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-10-27 04:18:09,065 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-10-27 04:18:09,329 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-10-27 04:18:09,520 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-10-27 04:18:09,761 WARN L179 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-10-27 04:18:09,986 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-10-27 04:18:10,213 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-10-27 04:18:10,451 WARN L179 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-10-27 04:18:10,679 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-27 04:18:10,917 WARN L179 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-27 04:18:11,156 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-27 04:18:11,409 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 04:18:12,255 WARN L179 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 04:18:12,513 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 04:18:12,783 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 04:18:13,144 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 04:18:13,404 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 04:18:13,672 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 Received shutdown request... [2018-10-27 04:18:13,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:18:13,708 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 04:18:13,711 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 04:18:13,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 04:18:13 BoogieIcfgContainer [2018-10-27 04:18:13,712 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 04:18:13,712 INFO L168 Benchmark]: Toolchain (without parser) took 249431.80 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 659.6 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -503.1 MB). Peak memory consumption was 156.5 MB. Max. memory is 7.1 GB. [2018-10-27 04:18:13,713 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:18:13,713 INFO L168 Benchmark]: CACSL2BoogieTranslator took 271.45 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 04:18:13,714 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.63 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:18:13,714 INFO L168 Benchmark]: Boogie Preprocessor took 27.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:18:13,714 INFO L168 Benchmark]: RCFGBuilder took 353.33 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 719.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -768.6 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-27 04:18:13,714 INFO L168 Benchmark]: TraceAbstraction took 248750.13 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -60.3 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 254.9 MB). Peak memory consumption was 194.6 MB. Max. memory is 7.1 GB. [2018-10-27 04:18:13,717 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 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 271.45 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 23.63 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.90 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 353.33 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 719.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -768.6 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 248750.13 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -60.3 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 254.9 MB). Peak memory consumption was 194.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 18 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 168 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 248.6s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 129.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3798 SDslu, 8662 SDs, 0 SdLazy, 4021 SolverSat, 2393 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8074 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2869 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28181 ImplicationChecksByTransitivity, 225.7s 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, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.8s SatisfiabilityAnalysisTime, 111.2s 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