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-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:31:55,248 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:31:55,251 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:31:55,267 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:31:55,267 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:31:55,269 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:31:55,271 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:31:55,273 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:31:55,277 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:31:55,279 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:31:55,280 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:31:55,280 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:31:55,282 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:31:55,284 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:31:55,287 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:31:55,288 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:31:55,288 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:31:55,293 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:31:55,295 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:31:55,297 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:31:55,300 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:31:55,301 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:31:55,305 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:31:55,306 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:31:55,306 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:31:55,307 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:31:55,308 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:31:55,309 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:31:55,311 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:31:55,313 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:31:55,313 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:31:55,313 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 15:31:55,318 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:31:55,344 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:31:55,344 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:31:55,345 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:31:55,345 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:31:55,346 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:31:55,346 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:31:55,346 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:31:55,346 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:31:55,346 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:31:55,347 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:31:55,347 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:31:55,347 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:31:55,348 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:31:55,348 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:31:55,348 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:31:55,348 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:31:55,349 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:31:55,349 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:31:55,349 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:31:55,349 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:31:55,350 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:31:55,350 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:31:55,350 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:31:55,350 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:31:55,350 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:31:55,351 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:31:55,351 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:31:55,351 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:31:55,351 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:31:55,351 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:31:55,351 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:31:55,352 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:31:55,352 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:31:55,352 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:31:55,395 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:31:55,408 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:31:55,412 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:31:55,413 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:31:55,414 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:31:55,415 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-27 15:31:55,478 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6112a40b4/94c72e8c6d124f7eadeda23907e8c831/FLAG2e906c02d [2018-10-27 15:31:55,934 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:31:55,935 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-27 15:31:55,943 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6112a40b4/94c72e8c6d124f7eadeda23907e8c831/FLAG2e906c02d [2018-10-27 15:31:55,961 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6112a40b4/94c72e8c6d124f7eadeda23907e8c831 [2018-10-27 15:31:55,973 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:31:55,975 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:31:55,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:31:55,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:31:55,980 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:31:55,982 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,985 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72c49ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55, skipping insertion in model container [2018-10-27 15:31:55,985 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,996 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:31:56,023 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:31:56,275 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:31:56,280 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:31:56,303 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:31:56,320 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:31:56,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56 WrapperNode [2018-10-27 15:31:56,321 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:31:56,321 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:31:56,322 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:31:56,322 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:31:56,331 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,337 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,344 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:31:56,345 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:31:56,345 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:31:56,345 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:31:56,354 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,354 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,355 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,355 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,359 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,365 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,366 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (1/1) ... [2018-10-27 15:31:56,368 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:31:56,369 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:31:56,369 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:31:56,369 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:31:56,370 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (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 15:31:56,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:31:56,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:31:56,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:31:56,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:31:56,504 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:31:56,505 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:31:56,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:31:56,506 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:31:56,716 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:31:56,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:31:56 BoogieIcfgContainer [2018-10-27 15:31:56,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:31:56,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:31:56,718 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:31:56,721 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:31:56,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:31:55" (1/3) ... [2018-10-27 15:31:56,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e2afcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:31:56, skipping insertion in model container [2018-10-27 15:31:56,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:56" (2/3) ... [2018-10-27 15:31:56,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11e2afcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:31:56, skipping insertion in model container [2018-10-27 15:31:56,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:31:56" (3/3) ... [2018-10-27 15:31:56,725 INFO L112 eAbstractionObserver]: Analyzing ICFG const_false-unreach-call1.i [2018-10-27 15:31:56,735 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:31:56,743 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:31:56,759 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:31:56,801 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:31:56,802 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:31:56,802 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:31:56,802 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:31:56,802 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:31:56,802 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:31:56,802 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:31:56,802 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:31:56,820 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-27 15:31:56,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 15:31:56,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:56,828 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:56,831 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:56,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:56,837 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-27 15:31:56,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:56,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:56,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,895 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:56,961 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 15:31:56,963 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:31:56,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:31:56,964 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:31:56,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:31:56,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:31:56,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:31:56,984 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-27 15:31:57,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:57,008 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 15:31:57,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:31:57,010 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 15:31:57,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:57,018 INFO L225 Difference]: With dead ends: 29 [2018-10-27 15:31:57,019 INFO L226 Difference]: Without dead ends: 12 [2018-10-27 15:31:57,022 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 15:31:57,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-27 15:31:57,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-27 15:31:57,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-27 15:31:57,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-27 15:31:57,061 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-27 15:31:57,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:57,061 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-27 15:31:57,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:31:57,062 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-27 15:31:57,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 15:31:57,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:57,063 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:57,063 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:57,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:57,063 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-27 15:31:57,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:57,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:57,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,065 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:57,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:57,249 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 15:31:57,250 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:31:57,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:31:57,251 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:31:57,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:31:57,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:31:57,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:31:57,256 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-27 15:31:57,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:57,307 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-27 15:31:57,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:31:57,308 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 15:31:57,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:57,309 INFO L225 Difference]: With dead ends: 19 [2018-10-27 15:31:57,309 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 15:31:57,311 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:31:57,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 15:31:57,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 15:31:57,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 15:31:57,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 15:31:57,317 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 15:31:57,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:57,318 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 15:31:57,318 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:31:57,319 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 15:31:57,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 15:31:57,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:57,320 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:57,321 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:57,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:57,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-27 15:31:57,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:57,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,323 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:57,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,323 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:57,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:57,583 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 15:31:57,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:57,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:57,589 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-27 15:31:57,591 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-27 15:31:57,628 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:31:57,629 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:31:57,736 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 15:31:57,849 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:31:57,853 INFO L272 AbstractInterpreter]: Visited 12 different actions 53 times. Merged at 3 different actions 19 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 15:31:57,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:57,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:31:57,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:57,875 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 15:31:57,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:57,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:31:57,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:57,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:57,986 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 15:31:57,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:58,085 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 15:31:58,107 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:58,107 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 15:31:58,107 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:58,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 15:31:58,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 15:31:58,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:31:58,108 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-27 15:31:58,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:58,135 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 15:31:58,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:31:58,136 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 15:31:58,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:58,137 INFO L225 Difference]: With dead ends: 21 [2018-10-27 15:31:58,137 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 15:31:58,138 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:31:58,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 15:31:58,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 15:31:58,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 15:31:58,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 15:31:58,143 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-27 15:31:58,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:58,143 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 15:31:58,143 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 15:31:58,143 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 15:31:58,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 15:31:58,144 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:58,144 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:58,144 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:58,145 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:58,145 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-27 15:31:58,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:58,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:58,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:58,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:58,309 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:58,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:58,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:58,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:58,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,310 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 15:31:58,326 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:31:58,326 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:31:58,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:31:58,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:31:58,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:58,405 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:58,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:58,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:58,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:58,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 15:31:58,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:58,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:31:58,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:31:58,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 15:31:58,734 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-27 15:31:58,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:58,771 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 15:31:58,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:31:58,772 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-27 15:31:58,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:58,774 INFO L225 Difference]: With dead ends: 23 [2018-10-27 15:31:58,774 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 15:31:58,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 15:31:58,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 15:31:58,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 15:31:58,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 15:31:58,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 15:31:58,779 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-27 15:31:58,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:58,780 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 15:31:58,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:31:58,780 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 15:31:58,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 15:31:58,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:58,781 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:58,781 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:58,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:58,782 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-27 15:31:58,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:58,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:31:58,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,784 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:58,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:58,943 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:58,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:58,946 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:58,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:58,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,946 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 15:31:58,956 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:31:58,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:31:58,970 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:31:58,971 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:31:58,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:58,988 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:58,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:59,250 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:59,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:59,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 15:31:59,273 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:59,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:31:59,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:31:59,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:31:59,275 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-27 15:31:59,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:59,320 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-27 15:31:59,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 15:31:59,321 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-27 15:31:59,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:59,324 INFO L225 Difference]: With dead ends: 25 [2018-10-27 15:31:59,324 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 15:31:59,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:31:59,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 15:31:59,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 15:31:59,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 15:31:59,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 15:31:59,330 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-27 15:31:59,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:59,330 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 15:31:59,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:31:59,331 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 15:31:59,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 15:31:59,332 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:59,332 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:59,332 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:59,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:59,333 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-27 15:31:59,333 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:59,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:31:59,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,334 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:59,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:59,492 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:59,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:59,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:59,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:59,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,494 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 15:31:59,504 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:59,504 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:31:59,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:59,515 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:59,537 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:31:59,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:00,519 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:00,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:00,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 15:32:00,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:00,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:32:00,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:32:00,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:32:00,542 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-27 15:32:00,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:00,587 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 15:32:00,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:32:00,589 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 15:32:00,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:00,590 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:32:00,590 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 15:32:00,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:32:00,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 15:32:00,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-27 15:32:00,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 15:32:00,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-27 15:32:00,596 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-27 15:32:00,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:00,596 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-27 15:32:00,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:32:00,596 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-27 15:32:00,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 15:32:00,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:00,597 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:00,597 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:00,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:00,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-27 15:32:00,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:00,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:00,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:00,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:00,599 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:00,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:00,757 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:00,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:00,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:00,758 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:00,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:00,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:00,758 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 15:32:00,766 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:00,766 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:00,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:32:00,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:00,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:00,887 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:00,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:01,490 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:01,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:01,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 15:32:01,514 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:01,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:32:01,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:32:01,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:32:01,515 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-27 15:32:01,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:01,622 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-27 15:32:01,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:32:01,625 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 15:32:01,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:01,626 INFO L225 Difference]: With dead ends: 29 [2018-10-27 15:32:01,626 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 15:32:01,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:32:01,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 15:32:01,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 15:32:01,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 15:32:01,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 15:32:01,632 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-27 15:32:01,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:01,633 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 15:32:01,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:32:01,633 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 15:32:01,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 15:32:01,634 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:01,634 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:01,634 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:01,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:01,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-27 15:32:01,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:01,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:01,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:01,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:01,636 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:01,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:01,900 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:01,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:01,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:01,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:01,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:32:01,910 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:01,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:01,924 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:01,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:01,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:01,939 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:01,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:02,443 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:02,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:02,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:32:02,477 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:02,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:32:02,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:32:02,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:32:02,479 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 15:32:02,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:02,546 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-27 15:32:02,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:32:02,547 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 15:32:02,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:02,548 INFO L225 Difference]: With dead ends: 31 [2018-10-27 15:32:02,548 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 15:32:02,548 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:32:02,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 15:32:02,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 15:32:02,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 15:32:02,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 15:32:02,554 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-27 15:32:02,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:02,554 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 15:32:02,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:32:02,554 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 15:32:02,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 15:32:02,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:02,555 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:02,556 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:02,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:02,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-27 15:32:02,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:02,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:02,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:02,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:02,734 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:02,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:02,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:02,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:02,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,736 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 15:32:02,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:02,744 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:02,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:02,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:02,803 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:02,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:06,470 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:06,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:06,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 15:32:06,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:06,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:32:06,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:32:06,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:32:06,493 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-27 15:32:06,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:06,652 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 15:32:06,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:32:06,655 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-27 15:32:06,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:06,655 INFO L225 Difference]: With dead ends: 33 [2018-10-27 15:32:06,655 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 15:32:06,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:32:06,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 15:32:06,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-27 15:32:06,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 15:32:06,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-27 15:32:06,660 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-27 15:32:06,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:06,661 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-27 15:32:06,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:32:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-27 15:32:06,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 15:32:06,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:06,662 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:06,662 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:06,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:06,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-27 15:32:06,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:06,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:06,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:06,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:06,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:06,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:06,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:06,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:06,907 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:06,907 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:06,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:06,907 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 15:32:06,917 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:06,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:06,955 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:32:06,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:06,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:06,972 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:06,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:14,761 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 70 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:14,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:14,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 15:32:14,782 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:14,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:32:14,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:32:14,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=260, Unknown=2, NotChecked=0, Total=380 [2018-10-27 15:32:14,784 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-27 15:32:14,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:14,892 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-27 15:32:14,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:32:14,893 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-27 15:32:14,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:14,894 INFO L225 Difference]: With dead ends: 35 [2018-10-27 15:32:14,894 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 15:32:14,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=118, Invalid=260, Unknown=2, NotChecked=0, Total=380 [2018-10-27 15:32:14,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 15:32:14,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-27 15:32:14,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 15:32:14,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 15:32:14,900 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-27 15:32:14,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:14,901 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 15:32:14,901 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:32:14,901 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 15:32:14,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 15:32:14,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:14,902 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:14,902 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:14,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:14,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-27 15:32:14,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:14,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:14,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:14,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:14,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:14,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:15,122 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:15,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:15,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:15,123 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:15,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:15,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:15,123 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 15:32:15,132 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:15,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:15,147 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:15,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:15,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:15,176 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:15,176 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:21,543 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:21,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:21,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 15:32:21,564 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:21,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:32:21,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:32:21,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 15:32:21,566 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-27 15:32:21,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:21,761 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-27 15:32:21,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 15:32:21,764 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-27 15:32:21,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:21,765 INFO L225 Difference]: With dead ends: 37 [2018-10-27 15:32:21,765 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 15:32:21,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 15:32:21,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 15:32:21,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-27 15:32:21,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 15:32:21,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 15:32:21,771 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-27 15:32:21,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:21,771 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 15:32:21,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:32:21,771 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 15:32:21,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 15:32:21,772 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:21,773 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:21,773 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:21,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:21,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-27 15:32:21,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:21,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:21,774 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:21,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:21,774 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:21,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:22,071 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:22,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:22,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:22,072 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:22,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:22,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:22,072 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 15:32:22,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:22,082 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:22,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:22,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:22,121 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:22,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:27,994 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:28,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:28,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 15:32:28,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:28,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:32:28,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:32:28,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-27 15:32:28,017 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-27 15:32:28,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:28,139 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 15:32:28,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:32:28,140 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-27 15:32:28,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:28,141 INFO L225 Difference]: With dead ends: 39 [2018-10-27 15:32:28,141 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 15:32:28,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-27 15:32:28,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 15:32:28,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 15:32:28,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 15:32:28,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 15:32:28,148 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-27 15:32:28,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:28,148 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 15:32:28,148 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:32:28,148 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 15:32:28,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 15:32:28,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:28,154 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:28,154 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:28,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:28,154 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-27 15:32:28,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:28,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:28,156 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:28,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:28,156 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:28,404 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:28,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:28,404 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:28,404 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:28,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:28,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:28,405 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 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 15:32:28,413 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:28,413 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:28,559 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:32:28,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:28,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:28,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:32,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:32,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 15:32:32,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:32,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:32:32,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:32:32,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:32:32,642 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-27 15:32:33,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:33,028 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-27 15:32:33,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:32:33,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-27 15:32:33,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:33,030 INFO L225 Difference]: With dead ends: 41 [2018-10-27 15:32:33,030 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 15:32:33,031 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:32:33,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 15:32:33,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 15:32:33,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 15:32:33,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 15:32:33,035 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-27 15:32:33,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:33,036 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 15:32:33,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:32:33,036 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 15:32:33,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 15:32:33,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:33,037 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:33,037 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:33,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:33,037 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-27 15:32:33,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:33,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:33,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:33,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:33,039 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:33,316 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:33,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:33,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:33,317 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:33,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:33,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:33,317 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 15:32:33,325 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:33,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:33,353 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:33,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:33,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:33,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:40,486 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:40,507 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:40,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 15:32:40,507 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:40,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:32:40,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:32:40,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-27 15:32:40,509 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-27 15:32:40,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:40,683 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-27 15:32:40,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:32:40,684 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-27 15:32:40,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:40,685 INFO L225 Difference]: With dead ends: 43 [2018-10-27 15:32:40,685 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 15:32:40,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-27 15:32:40,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 15:32:40,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-27 15:32:40,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 15:32:40,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 15:32:40,691 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-27 15:32:40,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:40,692 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 15:32:40,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:32:40,692 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 15:32:40,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 15:32:40,693 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:40,693 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:40,693 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:40,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:40,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-27 15:32:40,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:40,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:40,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:40,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:40,695 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:40,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:41,173 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:41,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:41,174 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:41,174 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:41,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:41,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:41,174 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 15:32:41,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:41,183 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:41,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:41,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:41,244 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:41,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:53,918 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:53,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:53,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 15:32:53,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:53,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 15:32:53,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 15:32:53,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 15:32:53,940 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-27 15:32:54,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:54,209 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 15:32:54,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:32:54,210 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-27 15:32:54,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:54,211 INFO L225 Difference]: With dead ends: 45 [2018-10-27 15:32:54,211 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 15:32:54,213 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 15:32:54,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 15:32:54,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-27 15:32:54,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 15:32:54,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-27 15:32:54,218 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-27 15:32:54,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:54,219 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-27 15:32:54,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 15:32:54,219 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-27 15:32:54,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 15:32:54,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:54,221 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:54,221 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:54,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:54,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-27 15:32:54,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:54,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:54,222 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:54,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:54,223 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:54,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:54,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:54,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:54,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:54,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:54,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:54,708 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 15:32:54,721 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:54,721 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:54,840 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 15:32:54,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:54,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:54,875 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:32:54,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:05,085 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:05,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:05,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 15:33:05,106 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:05,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:33:05,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:33:05,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-27 15:33:05,108 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-27 15:33:05,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:05,283 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-27 15:33:05,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:33:05,284 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-27 15:33:05,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:05,285 INFO L225 Difference]: With dead ends: 47 [2018-10-27 15:33:05,285 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 15:33:05,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-27 15:33:05,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 15:33:05,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-27 15:33:05,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 15:33:05,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 15:33:05,291 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-27 15:33:05,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:05,291 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 15:33:05,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:33:05,292 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 15:33:05,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 15:33:05,292 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:05,293 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:05,293 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:05,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:05,293 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-27 15:33:05,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:05,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:05,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:05,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:05,295 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:05,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:05,643 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:05,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:05,643 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:05,643 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:05,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:05,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:05,644 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 15:33:05,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:05,653 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:05,671 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:05,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:05,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:05,699 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:05,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:19,367 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 236 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:19,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:19,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 15:33:19,387 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:19,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:33:19,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:33:19,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=799, Unknown=2, NotChecked=0, Total=1122 [2018-10-27 15:33:19,388 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-27 15:33:19,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:19,639 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-27 15:33:19,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:33:19,640 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-27 15:33:19,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:19,641 INFO L225 Difference]: With dead ends: 49 [2018-10-27 15:33:19,641 INFO L226 Difference]: Without dead ends: 44 [2018-10-27 15:33:19,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=321, Invalid=799, Unknown=2, NotChecked=0, Total=1122 [2018-10-27 15:33:19,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-27 15:33:19,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-27 15:33:19,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 15:33:19,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 15:33:19,648 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-27 15:33:19,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:19,648 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 15:33:19,648 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:33:19,649 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 15:33:19,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 15:33:19,649 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:19,649 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:19,650 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:19,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:19,650 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-27 15:33:19,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:19,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:19,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:19,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:19,651 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:19,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:20,008 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:20,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:20,008 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:20,008 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:20,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:20,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:20,009 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 15:33:20,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:20,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:20,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:20,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:20,104 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:20,104 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:35,477 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 268 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:35,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:35,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 15:33:35,499 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:35,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:33:35,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:33:35,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=899, Unknown=3, NotChecked=0, Total=1260 [2018-10-27 15:33:35,500 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-27 15:33:35,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:35,854 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 15:33:35,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:33:35,854 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-27 15:33:35,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:35,856 INFO L225 Difference]: With dead ends: 51 [2018-10-27 15:33:35,856 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 15:33:35,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=358, Invalid=899, Unknown=3, NotChecked=0, Total=1260 [2018-10-27 15:33:35,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 15:33:35,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-27 15:33:35,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 15:33:35,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-27 15:33:35,863 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-27 15:33:35,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:35,863 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-27 15:33:35,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:33:35,863 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-27 15:33:35,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 15:33:35,864 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:35,864 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:35,864 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:35,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:35,865 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-27 15:33:35,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:35,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:35,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:35,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:35,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:35,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:36,564 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:36,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:36,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:36,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:36,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:36,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:36,565 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 15:33:36,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:36,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:37,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 15:33:37,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:37,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:37,243 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:37,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 304 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:56,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 15:33:56,425 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:56,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:33:56,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:33:56,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1006, Unknown=3, NotChecked=0, Total=1406 [2018-10-27 15:33:56,428 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-27 15:33:56,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:56,959 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-27 15:33:56,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:33:56,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-27 15:33:56,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:56,961 INFO L225 Difference]: With dead ends: 53 [2018-10-27 15:33:56,961 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 15:33:56,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=397, Invalid=1006, Unknown=3, NotChecked=0, Total=1406 [2018-10-27 15:33:56,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 15:33:56,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 15:33:56,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 15:33:56,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 15:33:56,968 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-27 15:33:56,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:56,968 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 15:33:56,968 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:33:56,968 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 15:33:56,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 15:33:56,969 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:56,969 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:56,969 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:56,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:56,970 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-27 15:33:56,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:56,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:56,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:56,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:56,971 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:56,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:57,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:57,352 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:57,352 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:57,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:57,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:57,353 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 15:33:57,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:57,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:57,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:57,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:57,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:57,478 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:57,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:24,601 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 336 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:24,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:24,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 15:34:24,622 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:24,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:34:24,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:34:24,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1118, Unknown=4, NotChecked=0, Total=1560 [2018-10-27 15:34:24,624 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-27 15:34:25,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:25,097 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-27 15:34:25,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:34:25,100 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-27 15:34:25,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:25,101 INFO L225 Difference]: With dead ends: 55 [2018-10-27 15:34:25,102 INFO L226 Difference]: Without dead ends: 50 [2018-10-27 15:34:25,103 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=438, Invalid=1118, Unknown=4, NotChecked=0, Total=1560 [2018-10-27 15:34:25,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-27 15:34:25,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-27 15:34:25,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 15:34:25,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 15:34:25,107 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-27 15:34:25,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:25,108 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 15:34:25,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:34:25,108 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 15:34:25,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 15:34:25,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:25,110 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:25,110 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:25,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:25,111 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-27 15:34:25,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:25,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:25,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:25,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:25,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:25,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:26,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:26,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:26,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:26,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:26,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:26,037 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 15:34:26,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:26,046 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:26,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:26,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:26,085 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:26,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:46,714 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 374 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:46,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:46,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 15:34:46,735 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:46,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:34:46,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:34:46,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1238, Unknown=3, NotChecked=0, Total=1722 [2018-10-27 15:34:46,736 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-27 15:34:47,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:47,041 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 15:34:47,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:34:47,042 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-27 15:34:47,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:47,043 INFO L225 Difference]: With dead ends: 57 [2018-10-27 15:34:47,043 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 15:34:47,044 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=481, Invalid=1238, Unknown=3, NotChecked=0, Total=1722 [2018-10-27 15:34:47,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 15:34:47,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 15:34:47,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 15:34:47,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 15:34:47,049 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-27 15:34:47,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:47,050 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 15:34:47,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:34:47,050 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 15:34:47,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 15:34:47,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:47,051 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:47,051 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:47,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:47,051 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-27 15:34:47,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:47,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:47,052 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:47,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:47,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:47,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:47,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:47,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:47,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:47,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:47,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:47,482 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 15:34:47,491 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:47,491 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:35:01,177 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 15:35:01,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:01,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:01,278 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:01,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:31,793 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 416 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:31,815 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:31,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 15:35:31,815 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:31,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 15:35:31,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 15:35:31,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1362, Unknown=4, NotChecked=0, Total=1892 [2018-10-27 15:35:31,817 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-27 15:35:32,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:32,180 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-27 15:35:32,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:35:32,183 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-27 15:35:32,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:32,184 INFO L225 Difference]: With dead ends: 59 [2018-10-27 15:35:32,184 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 15:35:32,185 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=526, Invalid=1362, Unknown=4, NotChecked=0, Total=1892 [2018-10-27 15:35:32,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 15:35:32,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-27 15:35:32,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 15:35:32,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 15:35:32,189 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-27 15:35:32,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:32,189 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 15:35:32,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 15:35:32,190 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 15:35:32,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 15:35:32,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:32,190 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:32,191 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:32,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:32,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-27 15:35:32,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:32,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:32,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:32,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:32,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:32,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:32,716 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:32,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:32,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:32,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:32,717 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:32,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:32,717 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 15:35:32,725 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:32,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:32,757 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:32,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:32,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:32,825 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:32,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:36:01,877 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 454 refuted. 8 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:01,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:36:01,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 15:36:01,897 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:36:01,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:36:01,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:36:01,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1492, Unknown=5, NotChecked=0, Total=2070 [2018-10-27 15:36:01,898 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-27 15:36:02,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:36:02,304 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-27 15:36:02,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 15:36:02,304 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-27 15:36:02,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:36:02,305 INFO L225 Difference]: With dead ends: 61 [2018-10-27 15:36:02,305 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 15:36:02,307 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=573, Invalid=1492, Unknown=5, NotChecked=0, Total=2070 [2018-10-27 15:36:02,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 15:36:02,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-27 15:36:02,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 15:36:02,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 15:36:02,311 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-27 15:36:02,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:36:02,312 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 15:36:02,312 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:36:02,312 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 15:36:02,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 15:36:02,312 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:36:02,313 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:36:02,313 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:36:02,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:36:02,313 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-27 15:36:02,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:36:02,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:02,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:36:02,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:02,314 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:36:02,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:36:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:03,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:03,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:36:03,284 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:36:03,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:36:03,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:03,284 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 15:36:03,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:36:03,291 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:36:03,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:36:03,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:36:03,339 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:03,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 15:36:38,665 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 15:36:38,866 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:36:38,867 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:36:38,872 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:36:38,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:36:38 BoogieIcfgContainer [2018-10-27 15:36:38,872 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:36:38,873 INFO L168 Benchmark]: Toolchain (without parser) took 282899.68 ms. Allocated memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: 1.0 GB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -536.8 MB). Peak memory consumption was 504.4 MB. Max. memory is 7.1 GB. [2018-10-27 15:36:38,875 INFO L168 Benchmark]: CDTParser took 0.20 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 15:36:38,876 INFO L168 Benchmark]: CACSL2BoogieTranslator took 345.00 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 15:36:38,876 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.31 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 15:36:38,877 INFO L168 Benchmark]: Boogie Preprocessor took 23.52 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 15:36:38,877 INFO L168 Benchmark]: RCFGBuilder took 347.86 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -790.3 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-27 15:36:38,878 INFO L168 Benchmark]: TraceAbstraction took 282154.87 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 315.1 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 242.9 MB). Peak memory consumption was 558.0 MB. Max. memory is 7.1 GB. [2018-10-27 15:36:38,882 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 345.00 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 23.31 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 23.52 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 347.86 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -790.3 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 282154.87 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 315.1 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 242.9 MB). Peak memory consumption was 558.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 56 with TraceHistMax 23,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 47 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. TIMEOUT Result, 282.0s OverallTime, 24 OverallIterations, 23 TraceHistogramMax, 4.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 491 SDtfs, 0 SDslu, 5567 SDs, 0 SdLazy, 4301 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1664 GetRequests, 1138 SyntacticMatches, 21 SemanticMatches, 505 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 222.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=23, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 23 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 15.2s SatisfiabilityAnalysisTime, 223.9s InterpolantComputationTime, 1407 NumberOfCodeBlocks, 1407 NumberOfCodeBlocksAsserted, 128 NumberOfCheckSat, 2035 ConstructedInterpolants, 0 QuantifiedInterpolants, 417109 SizeOfPredicates, 21 NumberOfNonLiveVariables, 1911 ConjunctsInSsa, 525 ConjunctsInUnsatCore, 65 InterpolantComputations, 2 PerfectInterpolantSequences, 0/10626 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown