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/loop-acceleration/nested_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:07:11,279 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:07:11,281 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:07:11,294 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:07:11,294 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:07:11,297 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:07:11,298 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:07:11,301 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:07:11,303 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:07:11,304 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:07:11,310 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:07:11,310 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:07:11,311 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:07:11,312 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:07:11,316 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:07:11,317 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:07:11,319 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:07:11,320 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:07:11,322 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:07:11,327 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:07:11,329 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:07:11,332 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:07:11,335 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:07:11,335 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:07:11,336 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:07:11,336 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:07:11,337 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:07:11,338 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:07:11,339 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:07:11,340 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:07:11,340 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:07:11,341 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:07:11,343 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 [2018-10-27 09:07:11,357 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:07:11,357 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:07:11,358 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:07:11,358 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:07:11,359 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:07:11,361 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:07:11,362 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:07:11,363 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:07:11,363 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:07:11,364 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:07:11,365 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:07:11,365 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:07:11,365 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:07:11,365 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:07:11,365 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:07:11,366 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:07:11,367 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:07:11,367 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:07:11,367 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:07:11,368 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:07:11,368 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:07:11,368 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:11,368 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:07:11,368 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:07:11,368 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:07:11,369 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:07:11,369 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:07:11,369 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:07:11,369 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:07:11,370 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:07:11,370 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:07:11,434 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:07:11,450 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:07:11,454 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:07:11,455 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:07:11,456 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:07:11,456 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-10-27 09:07:11,509 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cc3b2d8d6/0ee3b680d3874ea7a3b7678941227284/FLAG55232f735 [2018-10-27 09:07:11,946 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:07:11,947 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-10-27 09:07:11,952 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cc3b2d8d6/0ee3b680d3874ea7a3b7678941227284/FLAG55232f735 [2018-10-27 09:07:11,967 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cc3b2d8d6/0ee3b680d3874ea7a3b7678941227284 [2018-10-27 09:07:11,977 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:07:11,979 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:07:11,980 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:11,980 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:07:11,984 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:07:11,985 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:11" (1/1) ... [2018-10-27 09:07:11,988 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43083d73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:11, skipping insertion in model container [2018-10-27 09:07:11,988 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:11" (1/1) ... [2018-10-27 09:07:11,997 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:07:12,017 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:07:12,191 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:12,195 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:07:12,213 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:12,228 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:07:12,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12 WrapperNode [2018-10-27 09:07:12,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:12,230 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:12,230 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:07:12,231 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:07:12,240 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,246 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,252 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:12,253 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:07:12,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:07:12,253 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:07:12,263 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,264 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,268 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,274 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,275 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... [2018-10-27 09:07:12,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:07:12,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:07:12,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:07:12,277 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:07:12,278 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:12,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:07:12,333 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:07:12,334 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:07:12,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:07:12,334 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:07:12,334 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:07:12,334 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:07:12,334 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:07:12,629 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:07:12,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:12 BoogieIcfgContainer [2018-10-27 09:07:12,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:07:12,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:07:12,631 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:07:12,634 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:07:12,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:07:11" (1/3) ... [2018-10-27 09:07:12,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@238e4ed3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:12, skipping insertion in model container [2018-10-27 09:07:12,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:12" (2/3) ... [2018-10-27 09:07:12,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@238e4ed3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:12, skipping insertion in model container [2018-10-27 09:07:12,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:12" (3/3) ... [2018-10-27 09:07:12,637 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_false-unreach-call1.i [2018-10-27 09:07:12,646 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:07:12,653 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:07:12,671 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:07:12,704 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:07:12,704 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:07:12,704 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:07:12,704 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:07:12,704 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:07:12,705 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:07:12,705 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:07:12,705 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:07:12,723 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-27 09:07:12,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 09:07:12,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:12,731 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:12,733 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:12,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:12,740 INFO L82 PathProgramCache]: Analyzing trace with hash -283544510, now seen corresponding path program 1 times [2018-10-27 09:07:12,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:12,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:12,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:12,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:12,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:12,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:12,855 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:12,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:07:12,855 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:12,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:07:12,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:07:12,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:12,878 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-27 09:07:12,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:12,905 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2018-10-27 09:07:12,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:07:12,906 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 09:07:12,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:12,915 INFO L225 Difference]: With dead ends: 37 [2018-10-27 09:07:12,915 INFO L226 Difference]: Without dead ends: 15 [2018-10-27 09:07:12,919 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:12,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-27 09:07:12,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-27 09:07:12,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 09:07:12,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-27 09:07:12,954 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-27 09:07:12,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:12,954 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-27 09:07:12,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:07:12,954 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-27 09:07:12,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:07:12,955 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:12,955 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:12,956 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:12,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:12,956 INFO L82 PathProgramCache]: Analyzing trace with hash -863512858, now seen corresponding path program 1 times [2018-10-27 09:07:12,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:12,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:12,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:12,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:12,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:12,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:13,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:13,072 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:13,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:07:13,072 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:13,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:13,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:13,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:13,075 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 3 states. [2018-10-27 09:07:13,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:13,151 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-10-27 09:07:13,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:13,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 09:07:13,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:13,153 INFO L225 Difference]: With dead ends: 25 [2018-10-27 09:07:13,154 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 09:07:13,155 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:13,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 09:07:13,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2018-10-27 09:07:13,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-27 09:07:13,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-27 09:07:13,160 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-27 09:07:13,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:13,160 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-27 09:07:13,160 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:13,161 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-27 09:07:13,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-27 09:07:13,161 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:13,162 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:13,162 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:13,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:13,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1427803270, now seen corresponding path program 1 times [2018-10-27 09:07:13,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:13,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:13,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:13,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:13,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:13,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:13,264 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:13,265 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:13,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:07:13,265 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:13,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:13,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:13,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:13,266 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2018-10-27 09:07:13,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:13,315 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 09:07:13,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:13,315 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-27 09:07:13,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:13,316 INFO L225 Difference]: With dead ends: 29 [2018-10-27 09:07:13,317 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 09:07:13,317 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 [2018-10-27 09:07:13,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 09:07:13,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 09:07:13,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 09:07:13,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-27 09:07:13,325 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2018-10-27 09:07:13,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:13,326 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-27 09:07:13,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:13,326 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-27 09:07:13,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 09:07:13,329 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:13,329 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:13,330 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:13,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:13,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1523179828, now seen corresponding path program 1 times [2018-10-27 09:07:13,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:13,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:13,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:13,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:13,333 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:13,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:13,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:13,479 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:13,480 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-27 09:07:13,482 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [24], [28], [34], [37], [39], [45], [46], [47], [49] [2018-10-27 09:07:13,518 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:07:13,519 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:07:13,756 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:07:13,757 INFO L272 AbstractInterpreter]: Visited 16 different actions 35 times. Merged at 6 different actions 13 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 4 variables. [2018-10-27 09:07:13,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:13,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:07:13,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:13,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:13,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:13,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:13,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:13,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:13,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:13,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:14,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:07:14,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:14,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 9 [2018-10-27 09:07:14,250 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:14,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:07:14,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:07:14,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:07:14,254 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 7 states. [2018-10-27 09:07:14,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:14,534 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-10-27 09:07:14,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:07:14,535 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-10-27 09:07:14,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:14,536 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:07:14,536 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 09:07:14,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:14,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 09:07:14,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2018-10-27 09:07:14,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 09:07:14,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-27 09:07:14,545 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2018-10-27 09:07:14,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:14,546 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-27 09:07:14,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:07:14,546 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-27 09:07:14,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 09:07:14,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:14,548 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:14,548 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:14,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:14,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1070919706, now seen corresponding path program 2 times [2018-10-27 09:07:14,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:14,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:14,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:14,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:14,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:14,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:14,657 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 09:07:14,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:14,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:14,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:14,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:14,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:14,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:14,669 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:14,669 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:14,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:07:14,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:14,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:14,901 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:07:14,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:15,051 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-27 09:07:15,073 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:15,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2018-10-27 09:07:15,073 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:15,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:07:15,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:07:15,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:07:15,075 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2018-10-27 09:07:15,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:15,725 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2018-10-27 09:07:15,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:07:15,726 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-10-27 09:07:15,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:15,727 INFO L225 Difference]: With dead ends: 71 [2018-10-27 09:07:15,728 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 09:07:15,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:15,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 09:07:15,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-10-27 09:07:15,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 09:07:15,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-27 09:07:15,739 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2018-10-27 09:07:15,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:15,739 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-27 09:07:15,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:07:15,739 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-27 09:07:15,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 09:07:15,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:15,741 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:15,741 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:15,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:15,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1068904040, now seen corresponding path program 3 times [2018-10-27 09:07:15,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:15,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:15,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:15,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:15,743 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:15,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:15,954 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-10-27 09:07:15,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:15,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:15,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:15,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:15,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:15,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:15,968 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:15,968 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:15,988 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:15,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:15,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:16,146 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-27 09:07:16,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:16,323 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-27 09:07:16,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:16,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 6] total 17 [2018-10-27 09:07:16,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:16,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:07:16,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:07:16,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:07:16,345 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 13 states. [2018-10-27 09:07:16,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:16,855 INFO L93 Difference]: Finished difference Result 105 states and 118 transitions. [2018-10-27 09:07:16,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:07:16,857 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2018-10-27 09:07:16,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:16,858 INFO L225 Difference]: With dead ends: 105 [2018-10-27 09:07:16,859 INFO L226 Difference]: Without dead ends: 75 [2018-10-27 09:07:16,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=701, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:07:16,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-27 09:07:16,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 64. [2018-10-27 09:07:16,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-27 09:07:16,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2018-10-27 09:07:16,878 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 44 [2018-10-27 09:07:16,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:16,878 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2018-10-27 09:07:16,878 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:07:16,880 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2018-10-27 09:07:16,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-27 09:07:16,883 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:16,883 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:16,884 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:16,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:16,884 INFO L82 PathProgramCache]: Analyzing trace with hash 46746086, now seen corresponding path program 4 times [2018-10-27 09:07:16,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:16,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:16,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:16,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:17,314 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-10-27 09:07:17,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:17,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:17,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:17,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:17,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:17,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:17,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:17,322 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:17,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:17,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:17,484 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 346 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-27 09:07:17,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:17,630 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-10-27 09:07:17,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:17,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 7] total 16 [2018-10-27 09:07:17,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:17,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:07:17,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:07:17,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:17,653 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 11 states. [2018-10-27 09:07:17,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:17,853 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2018-10-27 09:07:17,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:07:17,856 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 63 [2018-10-27 09:07:17,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:17,857 INFO L225 Difference]: With dead ends: 93 [2018-10-27 09:07:17,857 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 09:07:17,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:17,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 09:07:17,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 77. [2018-10-27 09:07:17,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 09:07:17,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-10-27 09:07:17,871 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 63 [2018-10-27 09:07:17,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:17,871 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-10-27 09:07:17,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:07:17,871 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-10-27 09:07:17,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-27 09:07:17,874 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:17,874 INFO L375 BasicCegarLoop]: trace histogram [25, 20, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:17,874 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:17,874 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:17,875 INFO L82 PathProgramCache]: Analyzing trace with hash -742133662, now seen corresponding path program 5 times [2018-10-27 09:07:17,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:17,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:17,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,876 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:17,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:18,159 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 540 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 09:07:18,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:18,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:18,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:18,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:18,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:18,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:18,169 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:18,169 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:18,219 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:07:18,219 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:18,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:18,306 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-10-27 09:07:18,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:18,468 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-10-27 09:07:18,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:18,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2018-10-27 09:07:18,489 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:18,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:07:18,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:07:18,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:07:18,493 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-10-27 09:07:19,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:19,543 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-10-27 09:07:19,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:07:19,544 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 76 [2018-10-27 09:07:19,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:19,545 INFO L225 Difference]: With dead ends: 175 [2018-10-27 09:07:19,545 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 09:07:19,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=328, Invalid=1928, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:07:19,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 09:07:19,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 102. [2018-10-27 09:07:19,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 09:07:19,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 108 transitions. [2018-10-27 09:07:19,561 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 108 transitions. Word has length 76 [2018-10-27 09:07:19,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:19,562 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 108 transitions. [2018-10-27 09:07:19,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:07:19,562 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 108 transitions. [2018-10-27 09:07:19,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 09:07:19,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:19,564 INFO L375 BasicCegarLoop]: trace histogram [36, 30, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:19,564 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:19,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:19,564 INFO L82 PathProgramCache]: Analyzing trace with hash -1798689114, now seen corresponding path program 6 times [2018-10-27 09:07:19,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:19,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:19,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:19,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 0 proven. 1137 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-27 09:07:19,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:19,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:19,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:19,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:19,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:19,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:19,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:19,787 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:19,825 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:19,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:19,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:20,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-10-27 09:07:20,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-10-27 09:07:20,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:20,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-10-27 09:07:20,422 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:20,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:07:20,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:07:20,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:07:20,423 INFO L87 Difference]: Start difference. First operand 102 states and 108 transitions. Second operand 15 states. [2018-10-27 09:07:20,706 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-27 09:07:21,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:21,991 INFO L93 Difference]: Finished difference Result 229 states and 251 transitions. [2018-10-27 09:07:21,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 09:07:21,991 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 101 [2018-10-27 09:07:21,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:21,993 INFO L225 Difference]: With dead ends: 229 [2018-10-27 09:07:21,993 INFO L226 Difference]: Without dead ends: 146 [2018-10-27 09:07:21,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=487, Invalid=3419, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:07:21,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-27 09:07:22,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 131. [2018-10-27 09:07:22,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-27 09:07:22,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 138 transitions. [2018-10-27 09:07:22,020 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 138 transitions. Word has length 101 [2018-10-27 09:07:22,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:22,020 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 138 transitions. [2018-10-27 09:07:22,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:07:22,021 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 138 transitions. [2018-10-27 09:07:22,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-27 09:07:22,028 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:22,028 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:22,028 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:22,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:22,029 INFO L82 PathProgramCache]: Analyzing trace with hash 778877526, now seen corresponding path program 7 times [2018-10-27 09:07:22,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:22,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:22,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:22,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:22,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:22,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:22,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-27 09:07:22,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:22,510 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:22,510 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:22,510 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:22,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:22,510 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:22,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:22,520 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:22,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:22,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:22,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-10-27 09:07:22,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-10-27 09:07:23,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:23,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-10-27 09:07:23,236 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:23,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:07:23,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:07:23,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:23,237 INFO L87 Difference]: Start difference. First operand 131 states and 138 transitions. Second operand 17 states. [2018-10-27 09:07:25,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:25,611 INFO L93 Difference]: Finished difference Result 291 states and 316 transitions. [2018-10-27 09:07:25,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 09:07:25,611 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 130 [2018-10-27 09:07:25,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:25,613 INFO L225 Difference]: With dead ends: 291 [2018-10-27 09:07:25,613 INFO L226 Difference]: Without dead ends: 181 [2018-10-27 09:07:25,616 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1555 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=656, Invalid=5664, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 09:07:25,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-27 09:07:25,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 164. [2018-10-27 09:07:25,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-27 09:07:25,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 172 transitions. [2018-10-27 09:07:25,635 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 172 transitions. Word has length 130 [2018-10-27 09:07:25,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:25,635 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 172 transitions. [2018-10-27 09:07:25,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:07:25,636 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 172 transitions. [2018-10-27 09:07:25,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-10-27 09:07:25,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:25,638 INFO L375 BasicCegarLoop]: trace histogram [64, 56, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:25,639 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:25,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:25,639 INFO L82 PathProgramCache]: Analyzing trace with hash 402761190, now seen corresponding path program 8 times [2018-10-27 09:07:25,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:25,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:25,640 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:25,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:25,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:25,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:26,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 0 proven. 3684 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2018-10-27 09:07:26,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:26,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:26,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:26,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:26,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:26,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:26,102 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:26,103 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:26,164 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:07:26,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:26,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:26,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-10-27 09:07:26,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-10-27 09:07:26,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:26,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 27 [2018-10-27 09:07:26,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:26,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:07:26,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:07:26,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:07:26,624 INFO L87 Difference]: Start difference. First operand 164 states and 172 transitions. Second operand 19 states. [2018-10-27 09:07:28,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:28,916 INFO L93 Difference]: Finished difference Result 361 states and 389 transitions. [2018-10-27 09:07:28,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-10-27 09:07:28,916 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 163 [2018-10-27 09:07:28,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:28,918 INFO L225 Difference]: With dead ends: 361 [2018-10-27 09:07:28,918 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 09:07:28,922 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 311 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2581 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=829, Invalid=8873, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 09:07:28,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 09:07:28,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 201. [2018-10-27 09:07:28,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-27 09:07:28,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 210 transitions. [2018-10-27 09:07:28,942 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 210 transitions. Word has length 163 [2018-10-27 09:07:28,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:28,943 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 210 transitions. [2018-10-27 09:07:28,943 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:07:28,943 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 210 transitions. [2018-10-27 09:07:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-27 09:07:28,946 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:28,946 INFO L375 BasicCegarLoop]: trace histogram [81, 72, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:28,947 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:28,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:28,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1591963318, now seen corresponding path program 9 times [2018-10-27 09:07:28,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:28,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:28,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:28,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:28,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:28,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:29,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 0 proven. 5958 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-10-27 09:07:29,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:29,484 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:29,484 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:29,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:29,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:29,485 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:29,492 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:29,492 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:29,553 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:29,553 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:29,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:29,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-10-27 09:07:29,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:30,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-10-27 09:07:30,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:30,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 30 [2018-10-27 09:07:30,089 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:30,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:07:30,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:07:30,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:07:30,090 INFO L87 Difference]: Start difference. First operand 201 states and 210 transitions. Second operand 21 states. [2018-10-27 09:07:33,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:33,754 INFO L93 Difference]: Finished difference Result 439 states and 470 transitions. [2018-10-27 09:07:33,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-10-27 09:07:33,754 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 200 [2018-10-27 09:07:33,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:33,756 INFO L225 Difference]: With dead ends: 439 [2018-10-27 09:07:33,756 INFO L226 Difference]: Without dead ends: 263 [2018-10-27 09:07:33,760 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 383 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4040 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1000, Invalid=13280, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 09:07:33,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-10-27 09:07:33,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 242. [2018-10-27 09:07:33,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-10-27 09:07:33,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 252 transitions. [2018-10-27 09:07:33,786 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 252 transitions. Word has length 200 [2018-10-27 09:07:33,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:33,787 INFO L481 AbstractCegarLoop]: Abstraction has 242 states and 252 transitions. [2018-10-27 09:07:33,787 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:07:33,787 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 252 transitions. [2018-10-27 09:07:33,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2018-10-27 09:07:33,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:33,791 INFO L375 BasicCegarLoop]: trace histogram [100, 90, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:33,792 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:33,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,792 INFO L82 PathProgramCache]: Analyzing trace with hash 820866598, now seen corresponding path program 10 times [2018-10-27 09:07:33,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:33,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:33,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:33,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:34,159 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 0 proven. 9155 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2018-10-27 09:07:34,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:34,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:34,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:34,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:34,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:34,168 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:34,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:34,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:34,467 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-10-27 09:07:34,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:34,814 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-10-27 09:07:34,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:34,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2018-10-27 09:07:34,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:34,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:07:34,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:07:34,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:07:34,837 INFO L87 Difference]: Start difference. First operand 242 states and 252 transitions. Second operand 23 states. [2018-10-27 09:07:38,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:38,987 INFO L93 Difference]: Finished difference Result 525 states and 559 transitions. [2018-10-27 09:07:38,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-10-27 09:07:38,988 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 241 [2018-10-27 09:07:38,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:38,989 INFO L225 Difference]: With dead ends: 525 [2018-10-27 09:07:38,990 INFO L226 Difference]: Without dead ends: 310 [2018-10-27 09:07:38,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 464 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6040 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1163, Invalid=19143, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 09:07:38,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2018-10-27 09:07:39,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 287. [2018-10-27 09:07:39,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-27 09:07:39,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 298 transitions. [2018-10-27 09:07:39,017 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 298 transitions. Word has length 241 [2018-10-27 09:07:39,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:39,017 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 298 transitions. [2018-10-27 09:07:39,017 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:07:39,017 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 298 transitions. [2018-10-27 09:07:39,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-27 09:07:39,021 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:39,021 INFO L375 BasicCegarLoop]: trace histogram [121, 110, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:39,022 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:39,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:39,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1520240322, now seen corresponding path program 11 times [2018-10-27 09:07:39,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:39,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:39,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:39,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:39,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:39,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:39,553 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 0 proven. 13497 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2018-10-27 09:07:39,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:39,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:39,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:39,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:39,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:39,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:39,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:39,562 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown