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-EXP.epf -i ../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:23:52,243 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:23:52,245 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:23:52,257 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:23:52,258 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:23:52,259 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:23:52,260 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:23:52,262 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:23:52,264 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:23:52,264 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:23:52,266 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:23:52,266 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:23:52,267 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:23:52,268 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:23:52,269 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:23:52,270 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:23:52,271 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:23:52,273 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:23:52,275 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:23:52,276 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:23:52,278 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:23:52,279 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:23:52,281 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:23:52,282 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:23:52,282 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:23:52,283 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:23:52,284 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:23:52,285 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:23:52,286 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:23:52,287 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:23:52,287 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:23:52,288 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:23:52,288 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:23:52,288 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:23:52,290 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:23:52,290 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:23:52,291 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:23:52,306 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:23:52,306 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:23:52,307 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:23:52,307 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:23:52,308 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:23:52,308 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:23:52,308 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:23:52,308 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:23:52,308 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:23:52,309 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:23:52,309 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:23:52,309 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:23:52,309 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:23:52,309 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:23:52,310 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:23:52,310 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:23:52,310 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:23:52,311 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:23:52,311 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:23:52,311 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:23:52,311 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:23:52,311 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:23:52,312 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:23:52,312 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:23:52,312 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:23:52,312 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:23:52,312 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:23:52,313 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:23:52,313 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:23:52,313 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:23:52,313 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:23:52,313 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:23:52,314 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:23:52,314 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:23:52,314 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:23:52,314 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:23:52,373 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:23:52,386 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:23:52,390 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:23:52,391 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:23:52,392 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:23:52,393 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-24 12:23:52,455 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b1679bfbe/b93d2d47465a4a05a8815ec4744709c4/FLAGa37ddfd76 [2018-10-24 12:23:52,978 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:23:52,979 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-24 12:23:52,989 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b1679bfbe/b93d2d47465a4a05a8815ec4744709c4/FLAGa37ddfd76 [2018-10-24 12:23:53,003 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b1679bfbe/b93d2d47465a4a05a8815ec4744709c4 [2018-10-24 12:23:53,014 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:23:53,016 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:23:53,017 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:23:53,017 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:23:53,025 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:23:53,026 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,029 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44c4a7da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53, skipping insertion in model container [2018-10-24 12:23:53,029 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,040 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:23:53,073 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:23:53,355 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:23:53,366 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:23:53,406 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:23:53,456 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:23:53,456 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53 WrapperNode [2018-10-24 12:23:53,456 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:23:53,457 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:23:53,458 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:23:53,458 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:23:53,466 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,480 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,515 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:23:53,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:23:53,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:23:53,516 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:23:53,527 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,528 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,532 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,550 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... [2018-10-24 12:23:53,553 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:23:53,554 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:23:53,554 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:23:53,554 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:23:53,555 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:23:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:23:53,698 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:23:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2018-10-24 12:23:53,699 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2018-10-24 12:23:53,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:23:53,699 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:23:53,699 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2018-10-24 12:23:53,699 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2018-10-24 12:23:53,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2018-10-24 12:23:53,700 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2018-10-24 12:23:53,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:23:53,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:23:53,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:23:53,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:23:54,366 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:23:54,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:23:54 BoogieIcfgContainer [2018-10-24 12:23:54,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:23:54,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:23:54,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:23:54,372 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:23:54,372 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:23:53" (1/3) ... [2018-10-24 12:23:54,373 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@993c42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:23:54, skipping insertion in model container [2018-10-24 12:23:54,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:23:53" (2/3) ... [2018-10-24 12:23:54,373 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@993c42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:23:54, skipping insertion in model container [2018-10-24 12:23:54,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:23:54" (3/3) ... [2018-10-24 12:23:54,375 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24_false-unreach-call.i [2018-10-24 12:23:54,386 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:23:54,394 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:23:54,412 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:23:54,445 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:23:54,446 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:23:54,446 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:23:54,446 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:23:54,446 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:23:54,446 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:23:54,447 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:23:54,447 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:23:54,467 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2018-10-24 12:23:54,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:23:54,473 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:54,475 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:54,477 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:54,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:54,484 INFO L82 PathProgramCache]: Analyzing trace with hash 277346705, now seen corresponding path program 1 times [2018-10-24 12:23:54,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:54,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:54,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:54,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:54,542 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:54,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:54,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:23:54,633 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:23:54,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:23:54,634 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:23:54,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:23:54,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:23:54,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:23:54,656 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 2 states. [2018-10-24 12:23:54,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:23:54,693 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2018-10-24 12:23:54,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:23:54,696 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:23:54,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:23:54,705 INFO L225 Difference]: With dead ends: 101 [2018-10-24 12:23:54,706 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:23:54,710 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:23:54,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:23:54,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:23:54,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:23:54,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2018-10-24 12:23:54,755 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 13 [2018-10-24 12:23:54,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:23:54,755 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2018-10-24 12:23:54,756 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:23:54,756 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2018-10-24 12:23:54,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:23:54,757 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:54,757 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:54,758 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:54,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:54,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1161873536, now seen corresponding path program 1 times [2018-10-24 12:23:54,758 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:54,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:54,761 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:54,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:54,762 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:54,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:54,832 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:23:54,832 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:23:54,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:23:54,833 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:23:54,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:23:54,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:23:54,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:23:54,835 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand 3 states. [2018-10-24 12:23:55,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:23:55,023 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2018-10-24 12:23:55,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:23:55,024 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:23:55,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:23:55,026 INFO L225 Difference]: With dead ends: 113 [2018-10-24 12:23:55,026 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:23:55,028 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:23:55,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:23:55,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2018-10-24 12:23:55,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:23:55,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2018-10-24 12:23:55,043 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 15 [2018-10-24 12:23:55,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:23:55,043 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2018-10-24 12:23:55,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:23:55,043 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2018-10-24 12:23:55,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:23:55,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:55,045 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:55,045 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:55,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:55,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1375381986, now seen corresponding path program 1 times [2018-10-24 12:23:55,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:55,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:55,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:55,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:55,047 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:55,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:55,161 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:23:55,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:55,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:23:55,162 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-24 12:23:55,164 INFO L202 CegarAbsIntRunner]: [2], [3], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [113], [120], [123], [125], [131], [132], [133], [141] [2018-10-24 12:23:55,203 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:23:55,204 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:23:55,707 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:23:55,708 INFO L272 AbstractInterpreter]: Visited 23 different actions 73 times. Merged at 13 different actions 39 times. Widened at 1 different actions 1 times. Found 4 fixpoints after 3 different actions. Largest state had 35 variables. [2018-10-24 12:23:55,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:55,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:23:55,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:55,756 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:23:55,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:55,772 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:23:55,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:55,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:23:55,956 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:23:55,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:23:56,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:23:56,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:23:56,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:23:56,128 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:23:56,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:23:56,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:23:56,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:23:56,130 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2018-10-24 12:23:56,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:23:56,527 INFO L93 Difference]: Finished difference Result 141 states and 180 transitions. [2018-10-24 12:23:56,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:23:56,528 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-24 12:23:56,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:23:56,529 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:23:56,530 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:23:56,531 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:23:56,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:23:56,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2018-10-24 12:23:56,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:23:56,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 97 transitions. [2018-10-24 12:23:56,544 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 97 transitions. Word has length 25 [2018-10-24 12:23:56,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:23:56,544 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 97 transitions. [2018-10-24 12:23:56,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:23:56,545 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 97 transitions. [2018-10-24 12:23:56,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:23:56,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:56,547 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:56,548 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:56,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:56,548 INFO L82 PathProgramCache]: Analyzing trace with hash -103717632, now seen corresponding path program 2 times [2018-10-24 12:23:56,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:56,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:56,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:56,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:56,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:56,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:56,686 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:23:56,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:56,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:23:56,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:23:56,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:23:56,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:56,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:23:56,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:23:56,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:23:56,760 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:23:56,760 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:23:56,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:23:56,908 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:23:56,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:23:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:23:57,028 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:23:57,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-24 12:23:57,028 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:23:57,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:23:57,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:23:57,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:23:57,030 INFO L87 Difference]: Start difference. First operand 78 states and 97 transitions. Second operand 5 states. [2018-10-24 12:23:57,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:23:57,109 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2018-10-24 12:23:57,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:23:57,111 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-10-24 12:23:57,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:23:57,113 INFO L225 Difference]: With dead ends: 127 [2018-10-24 12:23:57,114 INFO L226 Difference]: Without dead ends: 122 [2018-10-24 12:23:57,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:23:57,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-24 12:23:57,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 80. [2018-10-24 12:23:57,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:23:57,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-10-24 12:23:57,128 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 35 [2018-10-24 12:23:57,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:23:57,128 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-10-24 12:23:57,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:23:57,129 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-10-24 12:23:57,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:23:57,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:57,131 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:57,131 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:57,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:57,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1875911917, now seen corresponding path program 1 times [2018-10-24 12:23:57,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:57,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:57,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:23:57,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:57,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:57,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:57,341 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:23:57,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:57,342 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:23:57,342 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 46 with the following transitions: [2018-10-24 12:23:57,342 INFO L202 CegarAbsIntRunner]: [2], [3], [4], [5], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [58], [60], [64], [67], [109], [113], [120], [123], [125], [131], [132], [133], [135], [136], [141] [2018-10-24 12:23:57,351 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:23:57,352 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:23:57,743 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:23:57,743 INFO L272 AbstractInterpreter]: Visited 32 different actions 135 times. Merged at 19 different actions 73 times. Widened at 2 different actions 7 times. Found 9 fixpoints after 4 different actions. Largest state had 37 variables. [2018-10-24 12:23:57,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:57,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:23:57,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:57,786 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:23:57,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:57,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:23:57,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:57,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:23:57,977 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:23:57,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:23:58,102 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:23:58,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:23:58,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:23:58,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:23:58,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:23:58,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:23:58,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:23:58,127 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 6 states. [2018-10-24 12:23:58,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:23:58,406 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2018-10-24 12:23:58,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:23:58,407 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2018-10-24 12:23:58,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:23:58,409 INFO L225 Difference]: With dead ends: 205 [2018-10-24 12:23:58,409 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:23:58,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:23:58,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:23:58,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 106. [2018-10-24 12:23:58,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-24 12:23:58,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2018-10-24 12:23:58,429 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 45 [2018-10-24 12:23:58,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:23:58,429 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2018-10-24 12:23:58,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:23:58,430 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2018-10-24 12:23:58,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:23:58,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:23:58,436 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:23:58,436 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:23:58,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:23:58,437 INFO L82 PathProgramCache]: Analyzing trace with hash -588961457, now seen corresponding path program 2 times [2018-10-24 12:23:58,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:23:58,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:58,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:23:58,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:23:58,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:23:58,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:23:58,612 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-10-24 12:23:58,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:58,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:23:58,613 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:23:58,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:23:58,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:23:58,613 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:23:58,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:23:58,623 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:23:58,695 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:23:58,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:23:58,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:23:58,898 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:23:58,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:23:59,177 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:23:59,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:23:59,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 16 [2018-10-24 12:23:59,210 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:23:59,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:23:59,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:23:59,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:23:59,212 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand 11 states. [2018-10-24 12:24:00,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:00,501 INFO L93 Difference]: Finished difference Result 462 states and 644 transitions. [2018-10-24 12:24:00,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:24:00,502 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-10-24 12:24:00,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:00,505 INFO L225 Difference]: With dead ends: 462 [2018-10-24 12:24:00,505 INFO L226 Difference]: Without dead ends: 370 [2018-10-24 12:24:00,507 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=224, Invalid=646, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:24:00,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2018-10-24 12:24:00,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 150. [2018-10-24 12:24:00,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:24:00,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 200 transitions. [2018-10-24 12:24:00,536 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 200 transitions. Word has length 55 [2018-10-24 12:24:00,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:00,537 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 200 transitions. [2018-10-24 12:24:00,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:24:00,537 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 200 transitions. [2018-10-24 12:24:00,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:24:00,540 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:00,540 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:00,541 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:00,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:00,541 INFO L82 PathProgramCache]: Analyzing trace with hash 175545882, now seen corresponding path program 3 times [2018-10-24 12:24:00,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:00,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:00,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:00,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:00,543 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:00,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:24:00,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:00,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:00,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:00,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:00,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:00,675 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:00,684 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:24:00,684 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:24:00,769 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:24:00,769 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:00,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:00,905 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:24:00,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:24:01,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:01,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:24:01,272 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:01,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:24:01,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:24:01,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:24:01,276 INFO L87 Difference]: Start difference. First operand 150 states and 200 transitions. Second operand 8 states. [2018-10-24 12:24:02,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:02,161 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2018-10-24 12:24:02,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:24:02,162 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2018-10-24 12:24:02,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:02,164 INFO L225 Difference]: With dead ends: 375 [2018-10-24 12:24:02,164 INFO L226 Difference]: Without dead ends: 245 [2018-10-24 12:24:02,166 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:24:02,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-24 12:24:02,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 176. [2018-10-24 12:24:02,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-24 12:24:02,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 236 transitions. [2018-10-24 12:24:02,188 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 236 transitions. Word has length 75 [2018-10-24 12:24:02,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:02,189 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 236 transitions. [2018-10-24 12:24:02,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:24:02,189 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 236 transitions. [2018-10-24 12:24:02,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:24:02,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:02,192 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:02,192 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:02,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:02,192 INFO L82 PathProgramCache]: Analyzing trace with hash -2053819268, now seen corresponding path program 4 times [2018-10-24 12:24:02,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:02,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:02,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:02,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:02,194 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:02,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:02,407 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:24:02,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:02,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:02,408 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:02,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:02,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:02,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:02,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:02,423 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:24:02,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:02,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:02,533 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:24:02,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:02,663 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:24:02,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:02,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:24:02,685 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:02,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:24:02,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:24:02,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:24:02,686 INFO L87 Difference]: Start difference. First operand 176 states and 236 transitions. Second operand 9 states. [2018-10-24 12:24:03,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:03,008 INFO L93 Difference]: Finished difference Result 424 states and 587 transitions. [2018-10-24 12:24:03,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:24:03,009 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 85 [2018-10-24 12:24:03,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:03,013 INFO L225 Difference]: With dead ends: 424 [2018-10-24 12:24:03,013 INFO L226 Difference]: Without dead ends: 271 [2018-10-24 12:24:03,014 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:24:03,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2018-10-24 12:24:03,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 202. [2018-10-24 12:24:03,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:24:03,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 272 transitions. [2018-10-24 12:24:03,039 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 272 transitions. Word has length 85 [2018-10-24 12:24:03,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:03,039 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 272 transitions. [2018-10-24 12:24:03,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:24:03,040 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 272 transitions. [2018-10-24 12:24:03,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:24:03,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:03,043 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:03,044 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:03,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:03,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1431295078, now seen corresponding path program 5 times [2018-10-24 12:24:03,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:03,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:03,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:03,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:03,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:03,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:03,417 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-24 12:24:03,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:03,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:03,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:03,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:03,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:03,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:03,451 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:24:03,452 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:24:03,522 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:24:03,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:03,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-24 12:24:03,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:04,026 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-24 12:24:04,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:04,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-10-24 12:24:04,048 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:04,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:24:04,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:24:04,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:24:04,049 INFO L87 Difference]: Start difference. First operand 202 states and 272 transitions. Second operand 15 states. [2018-10-24 12:24:04,954 WARN L179 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 10 [2018-10-24 12:24:07,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:07,326 INFO L93 Difference]: Finished difference Result 935 states and 1327 transitions. [2018-10-24 12:24:07,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:24:07,326 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 95 [2018-10-24 12:24:07,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:07,332 INFO L225 Difference]: With dead ends: 935 [2018-10-24 12:24:07,332 INFO L226 Difference]: Without dead ends: 756 [2018-10-24 12:24:07,335 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:24:07,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2018-10-24 12:24:07,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 246. [2018-10-24 12:24:07,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-24 12:24:07,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 336 transitions. [2018-10-24 12:24:07,374 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 336 transitions. Word has length 95 [2018-10-24 12:24:07,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:07,374 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 336 transitions. [2018-10-24 12:24:07,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:24:07,375 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 336 transitions. [2018-10-24 12:24:07,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-24 12:24:07,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:07,377 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:07,377 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:07,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:07,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1239096169, now seen corresponding path program 6 times [2018-10-24 12:24:07,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:07,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:07,379 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:07,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:07,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:07,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:07,549 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:24:07,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:07,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:07,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:07,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:07,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:07,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:07,567 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:24:07,567 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:24:07,654 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:24:07,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:07,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:07,686 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:24:07,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:08,027 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:24:08,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:08,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:24:08,051 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:08,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:24:08,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:24:08,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:24:08,053 INFO L87 Difference]: Start difference. First operand 246 states and 336 transitions. Second operand 11 states. [2018-10-24 12:24:08,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:08,900 INFO L93 Difference]: Finished difference Result 594 states and 837 transitions. [2018-10-24 12:24:08,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:24:08,906 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 115 [2018-10-24 12:24:08,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:08,909 INFO L225 Difference]: With dead ends: 594 [2018-10-24 12:24:08,909 INFO L226 Difference]: Without dead ends: 377 [2018-10-24 12:24:08,910 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:24:08,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-24 12:24:08,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 272. [2018-10-24 12:24:08,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-10-24 12:24:08,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 372 transitions. [2018-10-24 12:24:08,944 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 372 transitions. Word has length 115 [2018-10-24 12:24:08,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:08,944 INFO L481 AbstractCegarLoop]: Abstraction has 272 states and 372 transitions. [2018-10-24 12:24:08,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:24:08,944 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 372 transitions. [2018-10-24 12:24:08,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:24:08,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:08,947 INFO L375 BasicCegarLoop]: trace histogram [11, 9, 9, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:08,947 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:08,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:08,948 INFO L82 PathProgramCache]: Analyzing trace with hash -2041958265, now seen corresponding path program 7 times [2018-10-24 12:24:08,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:08,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:08,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:08,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:08,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:08,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:09,895 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:24:09,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:09,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:09,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:09,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:09,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:09,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:09,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:09,904 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:24:09,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:09,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:10,040 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:24:10,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:10,745 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:24:10,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:10,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:24:10,767 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:10,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:24:10,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:24:10,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:24:10,769 INFO L87 Difference]: Start difference. First operand 272 states and 372 transitions. Second operand 12 states. [2018-10-24 12:24:11,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:11,644 INFO L93 Difference]: Finished difference Result 643 states and 906 transitions. [2018-10-24 12:24:11,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:24:11,645 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 125 [2018-10-24 12:24:11,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:11,648 INFO L225 Difference]: With dead ends: 643 [2018-10-24 12:24:11,648 INFO L226 Difference]: Without dead ends: 403 [2018-10-24 12:24:11,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:24:11,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2018-10-24 12:24:11,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 298. [2018-10-24 12:24:11,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-24 12:24:11,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 408 transitions. [2018-10-24 12:24:11,684 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 408 transitions. Word has length 125 [2018-10-24 12:24:11,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:11,684 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 408 transitions. [2018-10-24 12:24:11,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:24:11,684 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 408 transitions. [2018-10-24 12:24:11,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-24 12:24:11,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:11,687 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 9, 9, 9, 9, 9, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:11,687 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:11,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:11,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1943870825, now seen corresponding path program 8 times [2018-10-24 12:24:11,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:11,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:11,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:11,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:11,689 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:11,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:12,503 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2018-10-24 12:24:12,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:12,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:12,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:12,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:12,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:12,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:12,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:24:12,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:24:12,583 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:24:12,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:12,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:12,753 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-24 12:24:12,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:13,238 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-24 12:24:13,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:13,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 26 [2018-10-24 12:24:13,266 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:13,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:24:13,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:24:13,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:24:13,268 INFO L87 Difference]: Start difference. First operand 298 states and 408 transitions. Second operand 19 states. [2018-10-24 12:24:16,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:16,925 INFO L93 Difference]: Finished difference Result 1540 states and 2202 transitions. [2018-10-24 12:24:16,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:24:16,926 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 135 [2018-10-24 12:24:16,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:16,934 INFO L225 Difference]: With dead ends: 1540 [2018-10-24 12:24:16,934 INFO L226 Difference]: Without dead ends: 1274 [2018-10-24 12:24:16,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1667 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1773, Invalid=4547, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:24:16,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2018-10-24 12:24:16,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 342. [2018-10-24 12:24:16,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2018-10-24 12:24:16,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 472 transitions. [2018-10-24 12:24:16,995 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 472 transitions. Word has length 135 [2018-10-24 12:24:16,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:16,995 INFO L481 AbstractCegarLoop]: Abstraction has 342 states and 472 transitions. [2018-10-24 12:24:16,995 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:24:16,995 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 472 transitions. [2018-10-24 12:24:16,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:24:16,998 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:16,998 INFO L375 BasicCegarLoop]: trace histogram [14, 11, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:16,998 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:16,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:16,999 INFO L82 PathProgramCache]: Analyzing trace with hash -168664780, now seen corresponding path program 9 times [2018-10-24 12:24:16,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:16,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:17,000 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:17,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:17,000 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:17,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:17,227 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:24:17,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:17,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:17,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:17,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:17,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:17,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:17,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:24:17,246 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:24:17,339 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:24:17,339 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:17,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:17,373 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:24:17,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:24:17,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:17,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:24:17,711 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:17,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:24:17,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:24:17,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:24:17,712 INFO L87 Difference]: Start difference. First operand 342 states and 472 transitions. Second operand 14 states. [2018-10-24 12:24:18,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:18,012 INFO L93 Difference]: Finished difference Result 813 states and 1156 transitions. [2018-10-24 12:24:18,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:24:18,012 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 155 [2018-10-24 12:24:18,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:18,015 INFO L225 Difference]: With dead ends: 813 [2018-10-24 12:24:18,015 INFO L226 Difference]: Without dead ends: 509 [2018-10-24 12:24:18,017 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:24:18,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2018-10-24 12:24:18,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 368. [2018-10-24 12:24:18,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2018-10-24 12:24:18,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 508 transitions. [2018-10-24 12:24:18,066 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 508 transitions. Word has length 155 [2018-10-24 12:24:18,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:18,067 INFO L481 AbstractCegarLoop]: Abstraction has 368 states and 508 transitions. [2018-10-24 12:24:18,067 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:24:18,067 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 508 transitions. [2018-10-24 12:24:18,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-24 12:24:18,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:18,069 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:18,070 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:18,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:18,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1485660182, now seen corresponding path program 10 times [2018-10-24 12:24:18,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:18,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:18,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:18,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:18,071 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:18,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:18,337 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:24:18,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:18,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:18,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:18,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:18,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:18,338 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:18,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:18,346 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:24:18,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:18,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:18,488 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:24:18,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:18,888 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:24:18,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:18,910 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:24:18,910 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:18,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:24:18,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:24:18,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:24:18,912 INFO L87 Difference]: Start difference. First operand 368 states and 508 transitions. Second operand 15 states. [2018-10-24 12:24:19,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:19,728 INFO L93 Difference]: Finished difference Result 862 states and 1225 transitions. [2018-10-24 12:24:19,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:24:19,729 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 165 [2018-10-24 12:24:19,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:19,733 INFO L225 Difference]: With dead ends: 862 [2018-10-24 12:24:19,734 INFO L226 Difference]: Without dead ends: 535 [2018-10-24 12:24:19,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:24:19,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2018-10-24 12:24:19,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 394. [2018-10-24 12:24:19,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-24 12:24:19,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 544 transitions. [2018-10-24 12:24:19,790 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 544 transitions. Word has length 165 [2018-10-24 12:24:19,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:19,791 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 544 transitions. [2018-10-24 12:24:19,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:24:19,791 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 544 transitions. [2018-10-24 12:24:19,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-24 12:24:19,794 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:19,794 INFO L375 BasicCegarLoop]: trace histogram [16, 13, 13, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:19,795 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:19,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:19,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1005051572, now seen corresponding path program 11 times [2018-10-24 12:24:19,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:19,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:19,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:19,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:19,796 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:20,656 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2018-10-24 12:24:20,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:20,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:20,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:20,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:20,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:20,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:20,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:24:20,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:24:20,750 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:24:20,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:20,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:20,985 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-24 12:24:20,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:21,489 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-24 12:24:21,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:21,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 10] total 31 [2018-10-24 12:24:21,513 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:21,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:24:21,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:24:21,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:24:21,516 INFO L87 Difference]: Start difference. First operand 394 states and 544 transitions. Second operand 23 states. [2018-10-24 12:24:24,285 WARN L179 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:24:28,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:28,360 INFO L93 Difference]: Finished difference Result 2277 states and 3269 transitions. [2018-10-24 12:24:28,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-24 12:24:28,361 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 175 [2018-10-24 12:24:28,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:28,368 INFO L225 Difference]: With dead ends: 2277 [2018-10-24 12:24:28,369 INFO L226 Difference]: Without dead ends: 1924 [2018-10-24 12:24:28,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3647, Invalid=9235, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:24:28,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2018-10-24 12:24:28,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 438. [2018-10-24 12:24:28,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2018-10-24 12:24:28,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 608 transitions. [2018-10-24 12:24:28,461 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 608 transitions. Word has length 175 [2018-10-24 12:24:28,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:28,461 INFO L481 AbstractCegarLoop]: Abstraction has 438 states and 608 transitions. [2018-10-24 12:24:28,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:24:28,462 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 608 transitions. [2018-10-24 12:24:28,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-24 12:24:28,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:28,464 INFO L375 BasicCegarLoop]: trace histogram [18, 14, 14, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:28,465 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:28,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:28,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1770266243, now seen corresponding path program 12 times [2018-10-24 12:24:28,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:28,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:28,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:28,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:28,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:28,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:28,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:24:28,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:28,749 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:28,749 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:28,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:28,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:28,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:28,758 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:24:28,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:24:28,863 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:24:28,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:28,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:28,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:24:28,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:29,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:24:29,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:29,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:24:29,325 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:29,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:24:29,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:24:29,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:24:29,327 INFO L87 Difference]: Start difference. First operand 438 states and 608 transitions. Second operand 17 states. [2018-10-24 12:24:30,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:30,211 INFO L93 Difference]: Finished difference Result 1032 states and 1475 transitions. [2018-10-24 12:24:30,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:24:30,212 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 195 [2018-10-24 12:24:30,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:30,215 INFO L225 Difference]: With dead ends: 1032 [2018-10-24 12:24:30,215 INFO L226 Difference]: Without dead ends: 641 [2018-10-24 12:24:30,216 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:24:30,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2018-10-24 12:24:30,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 464. [2018-10-24 12:24:30,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 464 states. [2018-10-24 12:24:30,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 644 transitions. [2018-10-24 12:24:30,304 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 644 transitions. Word has length 195 [2018-10-24 12:24:30,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:30,304 INFO L481 AbstractCegarLoop]: Abstraction has 464 states and 644 transitions. [2018-10-24 12:24:30,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:24:30,304 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 644 transitions. [2018-10-24 12:24:30,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-24 12:24:30,307 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:30,307 INFO L375 BasicCegarLoop]: trace histogram [19, 15, 15, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:30,308 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:30,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:30,308 INFO L82 PathProgramCache]: Analyzing trace with hash -2012988639, now seen corresponding path program 13 times [2018-10-24 12:24:30,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:30,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:30,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:30,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:30,310 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:30,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:31,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:24:31,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:31,118 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:31,118 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:31,118 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:31,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:31,119 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:31,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:31,131 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:24:31,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:31,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:31,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:24:31,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:31,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:24:31,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:31,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:24:31,929 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:31,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:24:31,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:24:31,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:24:31,931 INFO L87 Difference]: Start difference. First operand 464 states and 644 transitions. Second operand 18 states. [2018-10-24 12:24:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:32,479 INFO L93 Difference]: Finished difference Result 1081 states and 1544 transitions. [2018-10-24 12:24:32,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:24:32,480 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 205 [2018-10-24 12:24:32,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:32,484 INFO L225 Difference]: With dead ends: 1081 [2018-10-24 12:24:32,484 INFO L226 Difference]: Without dead ends: 667 [2018-10-24 12:24:32,486 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:24:32,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2018-10-24 12:24:32,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 490. [2018-10-24 12:24:32,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2018-10-24 12:24:32,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 680 transitions. [2018-10-24 12:24:32,582 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 680 transitions. Word has length 205 [2018-10-24 12:24:32,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:32,583 INFO L481 AbstractCegarLoop]: Abstraction has 490 states and 680 transitions. [2018-10-24 12:24:32,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:24:32,583 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 680 transitions. [2018-10-24 12:24:32,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-24 12:24:32,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:32,587 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 16, 15, 15, 15, 15, 15, 15, 15, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:32,587 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:32,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:32,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1457442685, now seen corresponding path program 14 times [2018-10-24 12:24:32,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:32,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:32,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:32,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:32,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:32,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:33,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2018-10-24 12:24:33,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:33,072 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:33,072 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:33,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:33,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:33,072 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:33,079 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:24:33,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:24:33,217 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:24:33,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:33,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:33,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-24 12:24:33,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:33,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-24 12:24:33,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:33,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-10-24 12:24:33,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:33,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:24:33,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:24:33,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1000, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:24:33,925 INFO L87 Difference]: Start difference. First operand 490 states and 680 transitions. Second operand 27 states. [2018-10-24 12:24:43,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:43,472 INFO L93 Difference]: Finished difference Result 3146 states and 4528 transitions. [2018-10-24 12:24:43,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2018-10-24 12:24:43,472 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 215 [2018-10-24 12:24:43,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:43,485 INFO L225 Difference]: With dead ends: 3146 [2018-10-24 12:24:43,485 INFO L226 Difference]: Without dead ends: 2706 [2018-10-24 12:24:43,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 515 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8108 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=6680, Invalid=16882, Unknown=0, NotChecked=0, Total=23562 [2018-10-24 12:24:43,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2706 states. [2018-10-24 12:24:43,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2706 to 534. [2018-10-24 12:24:43,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2018-10-24 12:24:43,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 744 transitions. [2018-10-24 12:24:43,638 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 744 transitions. Word has length 215 [2018-10-24 12:24:43,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:43,639 INFO L481 AbstractCegarLoop]: Abstraction has 534 states and 744 transitions. [2018-10-24 12:24:43,639 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:24:43,639 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 744 transitions. [2018-10-24 12:24:43,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-10-24 12:24:43,642 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:43,643 INFO L375 BasicCegarLoop]: trace histogram [22, 17, 17, 16, 16, 16, 16, 16, 16, 16, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:43,643 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:43,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:43,644 INFO L82 PathProgramCache]: Analyzing trace with hash 202859342, now seen corresponding path program 15 times [2018-10-24 12:24:43,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:43,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:43,645 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:43,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:43,645 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:43,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:45,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:24:45,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:45,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:45,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:45,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:45,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:45,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:45,134 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:24:45,134 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:24:45,265 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:24:45,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:45,273 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:45,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:24:45,421 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:46,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:24:46,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:46,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:24:46,842 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:46,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:24:46,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:24:46,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:24:46,844 INFO L87 Difference]: Start difference. First operand 534 states and 744 transitions. Second operand 20 states. [2018-10-24 12:24:47,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:47,972 INFO L93 Difference]: Finished difference Result 1251 states and 1794 transitions. [2018-10-24 12:24:47,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:24:47,973 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 235 [2018-10-24 12:24:47,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:47,978 INFO L225 Difference]: With dead ends: 1251 [2018-10-24 12:24:47,978 INFO L226 Difference]: Without dead ends: 773 [2018-10-24 12:24:47,981 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:24:47,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-24 12:24:48,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 560. [2018-10-24 12:24:48,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 560 states. [2018-10-24 12:24:48,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 780 transitions. [2018-10-24 12:24:48,128 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 780 transitions. Word has length 235 [2018-10-24 12:24:48,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:48,129 INFO L481 AbstractCegarLoop]: Abstraction has 560 states and 780 transitions. [2018-10-24 12:24:48,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:24:48,129 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 780 transitions. [2018-10-24 12:24:48,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-24 12:24:48,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:48,133 INFO L375 BasicCegarLoop]: trace histogram [23, 18, 18, 17, 17, 17, 17, 17, 17, 17, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:48,133 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:48,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:48,134 INFO L82 PathProgramCache]: Analyzing trace with hash 249227952, now seen corresponding path program 16 times [2018-10-24 12:24:48,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:48,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:48,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:24:48,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:48,135 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:48,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:49,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:24:49,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:49,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:49,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:49,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:49,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:49,948 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:49,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:49,957 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:24:50,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:50,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:50,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:24:50,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:51,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:24:51,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:51,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:24:51,078 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:51,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:24:51,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:24:51,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:24:51,080 INFO L87 Difference]: Start difference. First operand 560 states and 780 transitions. Second operand 21 states. [2018-10-24 12:24:52,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:24:52,010 INFO L93 Difference]: Finished difference Result 1300 states and 1863 transitions. [2018-10-24 12:24:52,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:24:52,010 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 245 [2018-10-24 12:24:52,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:24:52,017 INFO L225 Difference]: With dead ends: 1300 [2018-10-24 12:24:52,017 INFO L226 Difference]: Without dead ends: 799 [2018-10-24 12:24:52,020 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:24:52,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2018-10-24 12:24:52,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 586. [2018-10-24 12:24:52,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 586 states. [2018-10-24 12:24:52,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 816 transitions. [2018-10-24 12:24:52,182 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 816 transitions. Word has length 245 [2018-10-24 12:24:52,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:24:52,182 INFO L481 AbstractCegarLoop]: Abstraction has 586 states and 816 transitions. [2018-10-24 12:24:52,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:24:52,183 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 816 transitions. [2018-10-24 12:24:52,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:24:52,186 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:24:52,187 INFO L375 BasicCegarLoop]: trace histogram [24, 19, 19, 18, 18, 18, 18, 18, 18, 18, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:24:52,187 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:24:52,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:24:52,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1964715826, now seen corresponding path program 17 times [2018-10-24 12:24:52,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:24:52,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:52,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:24:52,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:24:52,189 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:24:52,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:24:53,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 1473 trivial. 0 not checked. [2018-10-24 12:24:53,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:53,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:24:53,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:24:53,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:24:53,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:24:53,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:24:53,111 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:24:53,111 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:24:53,321 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:24:53,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:24:53,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:24:53,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-24 12:24:53,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:24:54,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-24 12:24:54,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:24:54,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12, 12] total 41 [2018-10-24 12:24:54,192 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:24:54,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:24:54,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:24:54,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:24:54,193 INFO L87 Difference]: Start difference. First operand 586 states and 816 transitions. Second operand 31 states. [2018-10-24 12:25:04,201 WARN L179 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:25:09,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:09,385 INFO L93 Difference]: Finished difference Result 4147 states and 5979 transitions. [2018-10-24 12:25:09,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2018-10-24 12:25:09,385 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 255 [2018-10-24 12:25:09,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:09,399 INFO L225 Difference]: With dead ends: 4147 [2018-10-24 12:25:09,399 INFO L226 Difference]: Without dead ends: 3620 [2018-10-24 12:25:09,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14642 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=11259, Invalid=28541, Unknown=0, NotChecked=0, Total=39800 [2018-10-24 12:25:09,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3620 states. [2018-10-24 12:25:09,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3620 to 630. [2018-10-24 12:25:09,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 630 states. [2018-10-24 12:25:09,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 880 transitions. [2018-10-24 12:25:09,630 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 880 transitions. Word has length 255 [2018-10-24 12:25:09,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:09,631 INFO L481 AbstractCegarLoop]: Abstraction has 630 states and 880 transitions. [2018-10-24 12:25:09,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:25:09,631 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 880 transitions. [2018-10-24 12:25:09,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-24 12:25:09,635 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:09,636 INFO L375 BasicCegarLoop]: trace histogram [26, 20, 20, 19, 19, 19, 19, 19, 19, 19, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:09,636 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:09,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:09,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1157906275, now seen corresponding path program 18 times [2018-10-24 12:25:09,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:09,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:09,638 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:25:09,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:09,638 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:09,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:11,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:25:11,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:11,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:11,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:11,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:11,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:11,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:11,404 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:25:11,404 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:25:11,559 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:25:11,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:25:11,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:11,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:25:11,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:13,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:25:13,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:13,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:25:13,212 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:13,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:25:13,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:25:13,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:25:13,214 INFO L87 Difference]: Start difference. First operand 630 states and 880 transitions. Second operand 23 states. [2018-10-24 12:25:14,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:14,237 INFO L93 Difference]: Finished difference Result 1470 states and 2113 transitions. [2018-10-24 12:25:14,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:25:14,240 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 275 [2018-10-24 12:25:14,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:14,244 INFO L225 Difference]: With dead ends: 1470 [2018-10-24 12:25:14,245 INFO L226 Difference]: Without dead ends: 905 [2018-10-24 12:25:14,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:25:14,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 905 states. [2018-10-24 12:25:14,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 905 to 656. [2018-10-24 12:25:14,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 656 states. [2018-10-24 12:25:14,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 916 transitions. [2018-10-24 12:25:14,431 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 916 transitions. Word has length 275 [2018-10-24 12:25:14,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:14,431 INFO L481 AbstractCegarLoop]: Abstraction has 656 states and 916 transitions. [2018-10-24 12:25:14,431 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:25:14,431 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 916 transitions. [2018-10-24 12:25:14,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-24 12:25:14,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:14,435 INFO L375 BasicCegarLoop]: trace histogram [27, 21, 21, 20, 20, 20, 20, 20, 20, 20, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:14,436 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:14,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:14,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1671641925, now seen corresponding path program 19 times [2018-10-24 12:25:14,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:14,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:14,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:25:14,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:14,437 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:14,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:15,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:25:15,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:15,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:15,045 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:15,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:15,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:15,046 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:15,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:25:15,055 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:25:15,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:15,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:15,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:25:15,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:25:16,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:16,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:25:16,306 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:16,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:25:16,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:25:16,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:25:16,308 INFO L87 Difference]: Start difference. First operand 656 states and 916 transitions. Second operand 24 states. [2018-10-24 12:25:17,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:17,425 INFO L93 Difference]: Finished difference Result 1519 states and 2182 transitions. [2018-10-24 12:25:17,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:25:17,426 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 285 [2018-10-24 12:25:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:17,431 INFO L225 Difference]: With dead ends: 1519 [2018-10-24 12:25:17,431 INFO L226 Difference]: Without dead ends: 931 [2018-10-24 12:25:17,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 549 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:25:17,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2018-10-24 12:25:17,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 682. [2018-10-24 12:25:17,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2018-10-24 12:25:17,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 952 transitions. [2018-10-24 12:25:17,597 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 952 transitions. Word has length 285 [2018-10-24 12:25:17,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:17,597 INFO L481 AbstractCegarLoop]: Abstraction has 682 states and 952 transitions. [2018-10-24 12:25:17,597 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:25:17,597 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 952 transitions. [2018-10-24 12:25:17,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2018-10-24 12:25:17,601 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:17,602 INFO L375 BasicCegarLoop]: trace histogram [28, 22, 22, 21, 21, 21, 21, 21, 21, 21, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:17,602 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:17,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:17,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1483218275, now seen corresponding path program 20 times [2018-10-24 12:25:17,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:17,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:17,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:25:17,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:17,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:17,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:18,463 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:25:18,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:18,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:18,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:18,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:18,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:18,464 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:18,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:25:18,474 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:25:18,639 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:25:18,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:25:18,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:25:18,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:19,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:25:19,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:19,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 46 [2018-10-24 12:25:19,562 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:19,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:25:19,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:25:19,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1625, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:25:19,564 INFO L87 Difference]: Start difference. First operand 682 states and 952 transitions. Second operand 35 states. [2018-10-24 12:25:25,571 WARN L179 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:25:41,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:41,039 INFO L93 Difference]: Finished difference Result 5280 states and 7622 transitions. [2018-10-24 12:25:41,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2018-10-24 12:25:41,040 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 295 [2018-10-24 12:25:41,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:41,061 INFO L225 Difference]: With dead ends: 5280 [2018-10-24 12:25:41,061 INFO L226 Difference]: Without dead ends: 4666 [2018-10-24 12:25:41,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 738 SyntacticMatches, 15 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25982 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=17825, Invalid=45427, Unknown=0, NotChecked=0, Total=63252 [2018-10-24 12:25:41,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4666 states. [2018-10-24 12:25:41,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4666 to 726. [2018-10-24 12:25:41,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 726 states. [2018-10-24 12:25:41,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 1016 transitions. [2018-10-24 12:25:41,317 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 1016 transitions. Word has length 295 [2018-10-24 12:25:41,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:41,317 INFO L481 AbstractCegarLoop]: Abstraction has 726 states and 1016 transitions. [2018-10-24 12:25:41,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:25:41,318 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 1016 transitions. [2018-10-24 12:25:41,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-24 12:25:41,322 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:41,322 INFO L375 BasicCegarLoop]: trace histogram [30, 23, 23, 22, 22, 22, 22, 22, 22, 22, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:41,323 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:41,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:41,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1730421864, now seen corresponding path program 21 times [2018-10-24 12:25:41,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:41,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:41,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:25:41,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:41,325 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:41,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:42,826 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:25:42,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:42,826 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:42,827 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:42,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:42,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:42,827 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:42,834 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:25:42,835 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:25:43,012 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:25:43,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:25:43,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:43,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:25:43,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:44,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:25:44,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:44,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:25:44,208 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:44,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:25:44,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:25:44,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:25:44,210 INFO L87 Difference]: Start difference. First operand 726 states and 1016 transitions. Second operand 26 states. [2018-10-24 12:25:45,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:45,221 INFO L93 Difference]: Finished difference Result 1689 states and 2432 transitions. [2018-10-24 12:25:45,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:25:45,221 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 315 [2018-10-24 12:25:45,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:45,227 INFO L225 Difference]: With dead ends: 1689 [2018-10-24 12:25:45,227 INFO L226 Difference]: Without dead ends: 1037 [2018-10-24 12:25:45,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:25:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2018-10-24 12:25:45,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 752. [2018-10-24 12:25:45,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 752 states. [2018-10-24 12:25:45,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 752 states to 752 states and 1052 transitions. [2018-10-24 12:25:45,450 INFO L78 Accepts]: Start accepts. Automaton has 752 states and 1052 transitions. Word has length 315 [2018-10-24 12:25:45,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:45,450 INFO L481 AbstractCegarLoop]: Abstraction has 752 states and 1052 transitions. [2018-10-24 12:25:45,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:25:45,450 INFO L276 IsEmpty]: Start isEmpty. Operand 752 states and 1052 transitions. [2018-10-24 12:25:45,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-24 12:25:45,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:45,454 INFO L375 BasicCegarLoop]: trace histogram [31, 24, 24, 23, 23, 23, 23, 23, 23, 23, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:45,454 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:45,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:45,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1371253686, now seen corresponding path program 22 times [2018-10-24 12:25:45,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:45,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:45,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:25:45,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:45,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:45,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:25:46,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:46,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:46,221 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:46,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:46,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:46,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:46,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:25:46,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:25:46,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:46,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:46,490 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:25:46,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:47,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:25:47,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:47,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:25:47,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:47,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:25:47,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:25:47,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:25:47,819 INFO L87 Difference]: Start difference. First operand 752 states and 1052 transitions. Second operand 27 states. [2018-10-24 12:25:49,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:25:49,066 INFO L93 Difference]: Finished difference Result 1738 states and 2501 transitions. [2018-10-24 12:25:49,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:25:49,066 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 325 [2018-10-24 12:25:49,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:25:49,073 INFO L225 Difference]: With dead ends: 1738 [2018-10-24 12:25:49,073 INFO L226 Difference]: Without dead ends: 1063 [2018-10-24 12:25:49,075 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 626 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:25:49,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1063 states. [2018-10-24 12:25:49,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1063 to 778. [2018-10-24 12:25:49,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 778 states. [2018-10-24 12:25:49,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1088 transitions. [2018-10-24 12:25:49,296 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1088 transitions. Word has length 325 [2018-10-24 12:25:49,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:25:49,296 INFO L481 AbstractCegarLoop]: Abstraction has 778 states and 1088 transitions. [2018-10-24 12:25:49,296 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:25:49,296 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1088 transitions. [2018-10-24 12:25:49,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2018-10-24 12:25:49,301 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:25:49,301 INFO L375 BasicCegarLoop]: trace histogram [32, 25, 25, 24, 24, 24, 24, 24, 24, 24, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:25:49,302 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:25:49,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:25:49,302 INFO L82 PathProgramCache]: Analyzing trace with hash 686129640, now seen corresponding path program 23 times [2018-10-24 12:25:49,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:25:49,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:49,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:25:49,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:25:49,304 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:25:49,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:25:50,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 2644 trivial. 0 not checked. [2018-10-24 12:25:50,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:50,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:25:50,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:25:50,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:25:50,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:25:50,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:25:50,586 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:25:50,586 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:25:50,822 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:25:50,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:25:50,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:25:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-24 12:25:51,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:25:52,690 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:25:53,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-24 12:25:53,338 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:25:53,338 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14, 14] total 51 [2018-10-24 12:25:53,338 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:25:53,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:25:53,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:25:53,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1993, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:25:53,341 INFO L87 Difference]: Start difference. First operand 778 states and 1088 transitions. Second operand 39 states. [2018-10-24 12:26:20,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:26:20,607 INFO L93 Difference]: Finished difference Result 6545 states and 9457 transitions. [2018-10-24 12:26:20,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2018-10-24 12:26:20,607 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 335 [2018-10-24 12:26:20,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:26:20,622 INFO L225 Difference]: With dead ends: 6545 [2018-10-24 12:26:20,622 INFO L226 Difference]: Without dead ends: 5844 [2018-10-24 12:26:20,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 881 SyntacticMatches, 0 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40665 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=26873, Invalid=68917, Unknown=0, NotChecked=0, Total=95790 [2018-10-24 12:26:20,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5844 states. [2018-10-24 12:26:20,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5844 to 822. [2018-10-24 12:26:20,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 822 states. [2018-10-24 12:26:20,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 822 states to 822 states and 1152 transitions. [2018-10-24 12:26:20,922 INFO L78 Accepts]: Start accepts. Automaton has 822 states and 1152 transitions. Word has length 335 [2018-10-24 12:26:20,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:26:20,922 INFO L481 AbstractCegarLoop]: Abstraction has 822 states and 1152 transitions. [2018-10-24 12:26:20,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:26:20,923 INFO L276 IsEmpty]: Start isEmpty. Operand 822 states and 1152 transitions. [2018-10-24 12:26:20,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-10-24 12:26:20,927 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:26:20,927 INFO L375 BasicCegarLoop]: trace histogram [34, 26, 26, 25, 25, 25, 25, 25, 25, 25, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:26:20,928 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:26:20,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:26:20,928 INFO L82 PathProgramCache]: Analyzing trace with hash 115900855, now seen corresponding path program 24 times [2018-10-24 12:26:20,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:26:20,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:20,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:26:20,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:20,929 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:26:20,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:26:22,007 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:26:22,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:22,007 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:26:22,007 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:26:22,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:26:22,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:22,008 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:26:22,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:26:22,025 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:26:22,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:26:22,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:26:22,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:26:22,285 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:26:22,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:26:23,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:26:23,927 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:26:23,927 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:26:23,927 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:26:23,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:26:23,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:26:23,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:26:23,929 INFO L87 Difference]: Start difference. First operand 822 states and 1152 transitions. Second operand 29 states. [2018-10-24 12:26:25,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:26:25,204 INFO L93 Difference]: Finished difference Result 1908 states and 2751 transitions. [2018-10-24 12:26:25,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:26:25,204 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 355 [2018-10-24 12:26:25,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:26:25,208 INFO L225 Difference]: With dead ends: 1908 [2018-10-24 12:26:25,208 INFO L226 Difference]: Without dead ends: 1169 [2018-10-24 12:26:25,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 684 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:26:25,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1169 states. [2018-10-24 12:26:25,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1169 to 848. [2018-10-24 12:26:25,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 848 states. [2018-10-24 12:26:25,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 1188 transitions. [2018-10-24 12:26:25,636 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 1188 transitions. Word has length 355 [2018-10-24 12:26:25,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:26:25,637 INFO L481 AbstractCegarLoop]: Abstraction has 848 states and 1188 transitions. [2018-10-24 12:26:25,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:26:25,637 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 1188 transitions. [2018-10-24 12:26:25,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-24 12:26:25,641 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:26:25,641 INFO L375 BasicCegarLoop]: trace histogram [35, 27, 27, 26, 26, 26, 26, 26, 26, 26, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:26:25,641 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:26:25,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:26:25,642 INFO L82 PathProgramCache]: Analyzing trace with hash 796020053, now seen corresponding path program 25 times [2018-10-24 12:26:25,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:26:25,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:25,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:26:25,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:25,643 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:26:25,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:26:26,556 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:26:26,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:26,556 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:26:26,556 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:26:26,556 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:26:26,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:26,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:26:26,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:26:26,566 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:26:26,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:26:26,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:26:26,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:26:26,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:26:28,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:26:28,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:26:28,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:26:28,315 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:26:28,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:26:28,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:26:28,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:26:28,316 INFO L87 Difference]: Start difference. First operand 848 states and 1188 transitions. Second operand 30 states. [2018-10-24 12:26:29,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:26:29,527 INFO L93 Difference]: Finished difference Result 1957 states and 2820 transitions. [2018-10-24 12:26:29,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:26:29,528 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 365 [2018-10-24 12:26:29,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:26:29,534 INFO L225 Difference]: With dead ends: 1957 [2018-10-24 12:26:29,534 INFO L226 Difference]: Without dead ends: 1195 [2018-10-24 12:26:29,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 703 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:26:29,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1195 states. [2018-10-24 12:26:29,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1195 to 874. [2018-10-24 12:26:29,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 874 states. [2018-10-24 12:26:29,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1224 transitions. [2018-10-24 12:26:29,998 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1224 transitions. Word has length 365 [2018-10-24 12:26:29,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:26:29,998 INFO L481 AbstractCegarLoop]: Abstraction has 874 states and 1224 transitions. [2018-10-24 12:26:29,998 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:26:29,998 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1224 transitions. [2018-10-24 12:26:30,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-10-24 12:26:30,003 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:26:30,003 INFO L375 BasicCegarLoop]: trace histogram [36, 28, 28, 27, 27, 27, 27, 27, 27, 27, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:26:30,003 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:26:30,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:26:30,004 INFO L82 PathProgramCache]: Analyzing trace with hash -521686089, now seen corresponding path program 26 times [2018-10-24 12:26:30,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:26:30,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:30,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:26:30,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:26:30,005 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:26:30,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:26:30,871 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 3357 trivial. 0 not checked. [2018-10-24 12:26:30,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:30,872 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:26:30,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:26:30,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:26:30,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:26:30,872 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:26:30,880 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:26:30,880 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:26:31,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:26:31,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:26:31,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:26:32,046 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-24 12:26:32,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:26:32,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-24 12:26:32,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:26:32,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 15, 15] total 56 [2018-10-24 12:26:32,853 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:26:32,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:26:32,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:26:32,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=2398, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:26:32,854 INFO L87 Difference]: Start difference. First operand 874 states and 1224 transitions. Second operand 43 states. [2018-10-24 12:27:03,582 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-24 12:27:09,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:27:09,910 INFO L93 Difference]: Finished difference Result 7942 states and 11484 transitions. [2018-10-24 12:27:09,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 350 states. [2018-10-24 12:27:09,910 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 375 [2018-10-24 12:27:09,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:27:09,929 INFO L225 Difference]: With dead ends: 7942 [2018-10-24 12:27:09,929 INFO L226 Difference]: Without dead ends: 7154 [2018-10-24 12:27:09,940 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 1015 SyntacticMatches, 0 SemanticMatches, 372 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62504 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=38952, Invalid=100550, Unknown=0, NotChecked=0, Total=139502 [2018-10-24 12:27:09,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7154 states. [2018-10-24 12:27:10,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7154 to 918. [2018-10-24 12:27:10,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 918 states. [2018-10-24 12:27:10,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1288 transitions. [2018-10-24 12:27:10,533 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1288 transitions. Word has length 375 [2018-10-24 12:27:10,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:27:10,533 INFO L481 AbstractCegarLoop]: Abstraction has 918 states and 1288 transitions. [2018-10-24 12:27:10,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:27:10,533 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1288 transitions. [2018-10-24 12:27:10,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-24 12:27:10,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:27:10,538 INFO L375 BasicCegarLoop]: trace histogram [38, 29, 29, 28, 28, 28, 28, 28, 28, 28, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:27:10,538 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:27:10,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:27:10,539 INFO L82 PathProgramCache]: Analyzing trace with hash 907486338, now seen corresponding path program 27 times [2018-10-24 12:27:10,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:27:10,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:10,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:27:10,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:10,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:27:10,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:27:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:27:12,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:12,347 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:27:12,347 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:27:12,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:27:12,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:12,347 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:27:12,355 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:27:12,356 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:27:12,563 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:27:12,564 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:27:12,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:27:12,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:27:12,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:27:15,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:27:15,276 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:27:15,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:27:15,277 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:27:15,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:27:15,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:27:15,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:27:15,278 INFO L87 Difference]: Start difference. First operand 918 states and 1288 transitions. Second operand 32 states. [2018-10-24 12:27:16,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:27:16,622 INFO L93 Difference]: Finished difference Result 2127 states and 3070 transitions. [2018-10-24 12:27:16,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:27:16,623 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 395 [2018-10-24 12:27:16,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:27:16,627 INFO L225 Difference]: With dead ends: 2127 [2018-10-24 12:27:16,627 INFO L226 Difference]: Without dead ends: 1301 [2018-10-24 12:27:16,629 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:27:16,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1301 states. [2018-10-24 12:27:17,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1301 to 944. [2018-10-24 12:27:17,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 944 states. [2018-10-24 12:27:17,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1324 transitions. [2018-10-24 12:27:17,096 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1324 transitions. Word has length 395 [2018-10-24 12:27:17,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:27:17,096 INFO L481 AbstractCegarLoop]: Abstraction has 944 states and 1324 transitions. [2018-10-24 12:27:17,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:27:17,097 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1324 transitions. [2018-10-24 12:27:17,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-10-24 12:27:17,099 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:27:17,100 INFO L375 BasicCegarLoop]: trace histogram [39, 30, 30, 29, 29, 29, 29, 29, 29, 29, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:27:17,100 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:27:17,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:27:17,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1397759204, now seen corresponding path program 28 times [2018-10-24 12:27:17,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:27:17,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:17,101 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:27:17,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:17,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:27:17,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:27:17,887 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:27:17,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:17,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:27:17,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:27:17,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:27:17,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:17,888 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:27:17,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:27:17,897 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:27:18,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:27:18,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:27:18,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:27:18,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:27:20,172 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:27:20,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:27:20,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:27:20,196 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:27:20,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:27:20,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:27:20,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:27:20,198 INFO L87 Difference]: Start difference. First operand 944 states and 1324 transitions. Second operand 33 states. [2018-10-24 12:27:21,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:27:21,712 INFO L93 Difference]: Finished difference Result 2176 states and 3139 transitions. [2018-10-24 12:27:21,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:27:21,712 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 405 [2018-10-24 12:27:21,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:27:21,716 INFO L225 Difference]: With dead ends: 2176 [2018-10-24 12:27:21,716 INFO L226 Difference]: Without dead ends: 1327 [2018-10-24 12:27:21,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:27:21,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-10-24 12:27:22,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 970. [2018-10-24 12:27:22,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-10-24 12:27:22,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1360 transitions. [2018-10-24 12:27:22,069 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1360 transitions. Word has length 405 [2018-10-24 12:27:22,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:27:22,069 INFO L481 AbstractCegarLoop]: Abstraction has 970 states and 1360 transitions. [2018-10-24 12:27:22,069 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:27:22,069 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1360 transitions. [2018-10-24 12:27:22,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 416 [2018-10-24 12:27:22,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:27:22,073 INFO L375 BasicCegarLoop]: trace histogram [40, 31, 31, 30, 30, 30, 30, 30, 30, 30, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:27:22,073 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:27:22,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:27:22,073 INFO L82 PathProgramCache]: Analyzing trace with hash 2078831106, now seen corresponding path program 29 times [2018-10-24 12:27:22,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:27:22,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:22,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:27:22,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:27:22,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:27:22,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:27:23,077 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 4155 trivial. 0 not checked. [2018-10-24 12:27:23,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:23,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:27:23,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:27:23,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:27:23,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:27:23,077 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:27:23,086 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:27:23,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:27:23,415 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:27:23,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:27:23,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:27:24,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-24 12:27:24,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:27:25,009 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-24 12:27:25,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:27:25,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 61 [2018-10-24 12:27:25,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:27:25,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:27:25,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:27:25,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=2840, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:27:25,034 INFO L87 Difference]: Start difference. First operand 970 states and 1360 transitions. Second operand 47 states. Received shutdown request... [2018-10-24 12:27:45,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 257 states. [2018-10-24 12:27:45,336 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:27:45,342 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:27:45,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:27:45 BoogieIcfgContainer [2018-10-24 12:27:45,343 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:27:45,343 INFO L168 Benchmark]: Toolchain (without parser) took 232328.47 ms. Allocated memory was 1.5 GB in the beginning and 4.1 GB in the end (delta: 2.6 GB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -864.5 MB). Peak memory consumption was 1.7 GB. Max. memory is 7.1 GB. [2018-10-24 12:27:45,344 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:27:45,345 INFO L168 Benchmark]: CACSL2BoogieTranslator took 439.43 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:27:45,345 INFO L168 Benchmark]: Boogie Procedure Inliner took 58.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:27:45,346 INFO L168 Benchmark]: Boogie Preprocessor took 37.41 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:27:45,346 INFO L168 Benchmark]: RCFGBuilder took 813.67 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 734.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.9 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:27:45,347 INFO L168 Benchmark]: TraceAbstraction took 230974.58 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -107.7 MB). Peak memory consumption was 1.8 GB. Max. memory is 7.1 GB. [2018-10-24 12:27:45,350 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 439.43 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 58.22 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 37.41 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. * RCFGBuilder took 813.67 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 734.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.9 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230974.58 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -107.7 MB). Peak memory consumption was 1.8 GB. 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 constructing difference of abstraction (970states) and FLOYD_HOARE automaton (currently 257 states, 47 states before enhancement),while ReachableStatesComputation was computing reachable states (4401 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 55 locations, 1 error locations. TIMEOUT Result, 230.9s OverallTime, 33 OverallIterations, 40 TraceHistogramMax, 164.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 6736 SDtfs, 71775 SDslu, 39963 SDs, 0 SdLazy, 45588 SolverSat, 22862 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 51.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16841 GetRequests, 14325 SyntacticMatches, 15 SemanticMatches, 2501 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189484 ImplicationChecksByTransitivity, 117.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=970occurred in iteration=32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.0s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 4.9s AutomataMinimizationTime, 32 MinimizatonAttempts, 27461 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.0s SsaConstructionTime, 4.5s SatisfiabilityAnalysisTime, 52.0s InterpolantComputationTime, 13578 NumberOfCodeBlocks, 12568 NumberOfCodeBlocksAsserted, 139 NumberOfCheckSat, 20258 ConstructedInterpolants, 0 QuantifiedInterpolants, 10760600 SizeOfPredicates, 62 NumberOfNonLiveVariables, 22502 ConjunctsInSsa, 493 ConjunctsInUnsatCore, 95 InterpolantComputations, 4 PerfectInterpolantSequences, 139906/175128 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown