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-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:15:56,181 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:15:56,183 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:15:56,198 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:15:56,198 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:15:56,199 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:15:56,201 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:15:56,203 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:15:56,205 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:15:56,206 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:15:56,207 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:15:56,207 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:15:56,208 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:15:56,209 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:15:56,210 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:15:56,211 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:15:56,212 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:15:56,214 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:15:56,216 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:15:56,218 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:15:56,219 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:15:56,220 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:15:56,223 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:15:56,223 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:15:56,224 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:15:56,225 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:15:56,226 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:15:56,227 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:15:56,228 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:15:56,229 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:15:56,229 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:15:56,230 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 09:15:56,230 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 09:15:56,230 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 09:15:56,231 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 09:15:56,232 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 09:15:56,232 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 09:15:56,251 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:15:56,253 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:15:56,254 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:15:56,254 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:15:56,254 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:15:56,255 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:15:56,255 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:15:56,255 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:15:56,255 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:15:56,256 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:15:56,256 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:15:56,256 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:15:56,256 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:15:56,256 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:15:56,257 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:15:56,258 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:15:56,258 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:15:56,258 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:15:56,258 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:15:56,258 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:15:56,259 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:15:56,259 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:15:56,259 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:15:56,259 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:15:56,259 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:15:56,260 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:15:56,261 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:15:56,262 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:15:56,262 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:15:56,262 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:15:56,262 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:15:56,262 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:15:56,263 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:15:56,263 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:15:56,263 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:15:56,264 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:15:56,321 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:15:56,341 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:15:56,346 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:15:56,348 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:15:56,348 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:15:56,349 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-27 09:15:56,418 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/bcf0be4e5/3801f2a3b38f40a2a339a5a8380deda0/FLAGa1f0e181e [2018-10-27 09:15:56,900 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:15:56,901 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-27 09:15:56,906 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/bcf0be4e5/3801f2a3b38f40a2a339a5a8380deda0/FLAGa1f0e181e [2018-10-27 09:15:56,924 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/bcf0be4e5/3801f2a3b38f40a2a339a5a8380deda0 [2018-10-27 09:15:56,937 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:15:56,939 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:15:56,940 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:15:56,941 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:15:56,945 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:15:56,946 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:15:56" (1/1) ... [2018-10-27 09:15:56,950 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12c2d363 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:56, skipping insertion in model container [2018-10-27 09:15:56,950 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:15:56" (1/1) ... [2018-10-27 09:15:56,961 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:15:56,988 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:15:57,210 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:15:57,215 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:15:57,238 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:15:57,256 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:15:57,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57 WrapperNode [2018-10-27 09:15:57,257 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:15:57,258 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:15:57,258 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:15:57,258 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:15:57,269 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,276 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:15:57,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:15:57,284 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:15:57,284 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:15:57,300 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,300 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,301 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,301 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,306 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (1/1) ... [2018-10-27 09:15:57,316 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:15:57,316 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:15:57,317 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:15:57,317 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:15:57,318 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (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 09:15:57,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:15:57,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:15:57,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:15:57,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:15:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:15:57,393 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:15:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:15:57,393 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:15:57,675 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:15:57,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:15:57 BoogieIcfgContainer [2018-10-27 09:15:57,676 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:15:57,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:15:57,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:15:57,690 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:15:57,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:15:56" (1/3) ... [2018-10-27 09:15:57,691 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ed65315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:15:57, skipping insertion in model container [2018-10-27 09:15:57,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:15:57" (2/3) ... [2018-10-27 09:15:57,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ed65315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:15:57, skipping insertion in model container [2018-10-27 09:15:57,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:15:57" (3/3) ... [2018-10-27 09:15:57,701 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-10-27 09:15:57,736 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:15:57,746 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:15:57,767 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:15:57,804 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:15:57,804 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:15:57,804 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:15:57,804 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:15:57,805 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:15:57,805 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:15:57,805 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:15:57,805 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:15:57,826 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-27 09:15:57,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:15:57,833 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:57,834 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:57,839 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:57,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:57,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-10-27 09:15:57,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:57,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:57,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:57,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:57,907 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:57,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:57,985 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 09:15:57,987 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:15:57,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:15:57,988 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:15:57,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:15:58,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:15:58,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:15:58,011 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-27 09:15:58,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:58,034 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-27 09:15:58,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:15:58,036 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-27 09:15:58,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:58,044 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:15:58,045 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 09:15:58,048 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 09:15:58,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 09:15:58,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 09:15:58,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 09:15:58,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 09:15:58,086 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 09:15:58,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:58,087 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 09:15:58,087 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:15:58,087 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 09:15:58,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-27 09:15:58,088 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:58,088 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:58,088 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:58,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:58,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-10-27 09:15:58,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:58,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:58,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:58,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:58,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:58,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:58,358 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 09:15:58,358 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:15:58,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-27 09:15:58,359 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:15:58,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:15:58,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:15:58,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:15:58,362 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-27 09:15:58,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:58,500 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 09:15:58,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 09:15:58,501 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-10-27 09:15:58,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:58,502 INFO L225 Difference]: With dead ends: 21 [2018-10-27 09:15:58,502 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 09:15:58,503 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:15:58,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 09:15:58,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 09:15:58,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 09:15:58,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 09:15:58,508 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-10-27 09:15:58,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:58,509 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 09:15:58,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:15:58,509 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 09:15:58,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 09:15:58,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:58,510 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:58,510 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:58,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:58,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-10-27 09:15:58,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:58,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:58,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:58,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:58,512 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:58,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:58,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:58,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:58,607 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-27 09:15:58,610 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 09:15:58,646 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:15:58,646 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:15:58,819 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:15:58,820 INFO L272 AbstractInterpreter]: Visited 14 different actions 30 times. Merged at 4 different actions 8 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 09:15:58,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:58,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:15:58,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:58,840 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 09:15:58,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:58,858 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:15:58,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:58,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:15:59,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:59,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:15:59,311 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:59,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:15:59,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 09:15:59,334 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:15:59,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:15:59,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:15:59,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-10-27 09:15:59,336 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-27 09:15:59,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:15:59,468 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-27 09:15:59,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:15:59,469 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-27 09:15:59,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:15:59,470 INFO L225 Difference]: With dead ends: 30 [2018-10-27 09:15:59,470 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 09:15:59,470 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:15:59,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 09:15:59,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-27 09:15:59,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 09:15:59,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-27 09:15:59,478 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-10-27 09:15:59,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:15:59,478 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-27 09:15:59,479 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:15:59,479 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-27 09:15:59,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 09:15:59,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:15:59,481 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:15:59,481 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:15:59,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:15:59,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-10-27 09:15:59,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:15:59,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:59,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:15:59,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:15:59,483 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:15:59,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:15:59,777 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:15:59,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:59,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:15:59,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:15:59,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:15:59,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:15:59,779 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 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 09:15:59,794 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:15:59,794 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:15:59,825 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 09:15:59,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:15:59,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:00,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:00,369 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:00,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:00,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 09:16:00,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:00,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:16:00,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:16:00,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:16:00,405 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-10-27 09:16:00,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:00,868 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-27 09:16:00,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:16:00,869 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-27 09:16:00,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:00,870 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:16:00,870 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 09:16:00,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:16:00,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 09:16:00,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 09:16:00,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 09:16:00,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 09:16:00,880 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-10-27 09:16:00,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:00,880 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 09:16:00,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:16:00,880 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 09:16:00,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 09:16:00,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:00,882 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:00,882 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:00,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:00,882 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-10-27 09:16:00,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:00,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:00,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:00,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:00,884 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:00,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:01,053 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:01,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:01,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:01,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:01,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:01,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:01,055 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 09:16:01,064 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:01,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:01,085 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:01,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:01,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:01,211 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:01,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:01,526 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:01,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:01,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 09:16:01,557 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:01,558 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:16:01,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:16:01,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:16:01,559 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-10-27 09:16:01,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:01,911 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-10-27 09:16:01,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:16:01,919 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-27 09:16:01,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:01,921 INFO L225 Difference]: With dead ends: 48 [2018-10-27 09:16:01,921 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 09:16:01,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:16:01,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 09:16:01,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-27 09:16:01,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 09:16:01,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-27 09:16:01,937 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-10-27 09:16:01,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:01,937 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-27 09:16:01,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:16:01,938 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-27 09:16:01,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-27 09:16:01,945 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:01,946 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:01,946 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:01,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:01,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-10-27 09:16:01,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:01,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:01,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:01,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:01,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:01,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:02,302 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:02,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:02,303 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:02,303 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:02,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:02,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:02,304 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 09:16:02,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:02,312 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:02,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:02,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:02,443 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:02,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:03,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:03,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 09:16:03,057 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:03,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:16:03,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:16:03,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:16:03,059 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-10-27 09:16:03,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:03,704 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-27 09:16:03,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:16:03,706 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-27 09:16:03,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:03,707 INFO L225 Difference]: With dead ends: 57 [2018-10-27 09:16:03,707 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 09:16:03,709 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:16:03,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 09:16:03,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 09:16:03,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 09:16:03,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 09:16:03,717 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-10-27 09:16:03,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:03,717 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 09:16:03,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:16:03,718 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 09:16:03,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 09:16:03,719 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:03,719 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:03,720 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:03,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:03,720 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-10-27 09:16:03,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:03,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:03,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:03,722 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:03,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:04,508 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:04,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:04,509 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:04,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:04,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:04,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:04,509 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 09:16:04,518 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:04,518 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:04,537 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 09:16:04,537 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:04,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:04,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:05,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:05,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 09:16:05,255 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:05,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:16:05,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:16:05,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:16:05,259 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-10-27 09:16:05,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:05,908 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-10-27 09:16:05,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:16:05,910 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-10-27 09:16:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:05,911 INFO L225 Difference]: With dead ends: 66 [2018-10-27 09:16:05,911 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 09:16:05,913 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:16:05,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 09:16:05,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-27 09:16:05,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-27 09:16:05,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-27 09:16:05,922 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-10-27 09:16:05,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:05,922 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-27 09:16:05,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:16:05,923 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-27 09:16:05,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 09:16:05,924 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:05,925 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:05,925 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:05,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:05,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-10-27 09:16:05,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:05,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:05,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:05,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:05,927 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:05,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:06,466 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:06,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:06,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:06,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:06,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:06,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:06,467 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 09:16:06,475 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:06,476 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:06,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:06,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:06,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:06,598 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:06,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:07,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:07,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 09:16:07,665 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:07,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:16:07,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:16:07,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:16:07,667 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-10-27 09:16:08,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:08,555 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-10-27 09:16:08,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:16:08,556 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-10-27 09:16:08,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:08,558 INFO L225 Difference]: With dead ends: 75 [2018-10-27 09:16:08,558 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 09:16:08,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:16:08,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 09:16:08,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-27 09:16:08,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 09:16:08,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-27 09:16:08,569 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-10-27 09:16:08,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:08,569 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-27 09:16:08,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:16:08,569 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-27 09:16:08,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 09:16:08,571 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:08,571 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:08,572 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:08,572 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:08,572 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-10-27 09:16:08,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:08,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:08,573 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:08,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:08,574 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:08,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:09,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:09,300 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:09,300 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:09,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:09,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:09,300 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 09:16:09,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:09,308 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:09,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:09,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:09,439 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:09,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:10,544 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:10,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:10,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 09:16:10,565 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:10,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:16:10,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:16:10,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:16:10,568 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-10-27 09:16:11,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:11,727 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-10-27 09:16:11,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:16:11,728 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-27 09:16:11,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:11,730 INFO L225 Difference]: With dead ends: 84 [2018-10-27 09:16:11,730 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 09:16:11,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 09:16:11,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 09:16:11,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-27 09:16:11,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 09:16:11,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-10-27 09:16:11,740 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-10-27 09:16:11,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:11,741 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-10-27 09:16:11,741 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:16:11,741 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-10-27 09:16:11,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-27 09:16:11,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:11,743 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:11,743 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:11,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:11,744 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-10-27 09:16:11,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:11,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:11,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:11,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:11,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:11,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:12,634 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:12,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:12,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:12,635 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:12,636 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:12,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:12,636 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 09:16:12,645 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:12,646 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:12,680 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-27 09:16:12,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:12,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:12,805 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:12,805 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:13,708 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:13,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:13,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 09:16:13,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:13,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:16:13,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:16:13,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:16:13,735 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-10-27 09:16:14,615 WARN L179 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-10-27 09:16:15,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:15,468 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-10-27 09:16:15,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:16:15,472 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-10-27 09:16:15,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:15,473 INFO L225 Difference]: With dead ends: 93 [2018-10-27 09:16:15,473 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 09:16:15,476 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 09:16:15,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 09:16:15,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-27 09:16:15,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-27 09:16:15,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-10-27 09:16:15,486 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-10-27 09:16:15,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:15,487 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-10-27 09:16:15,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:16:15,487 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-10-27 09:16:15,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-27 09:16:15,490 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:15,490 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:15,490 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:15,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:15,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-10-27 09:16:15,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:15,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:15,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:15,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:16,861 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:16,861 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:16,861 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:16,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:16,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:16,862 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 09:16:16,879 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:16,879 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:16,909 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:16,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:16,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:17,059 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:17,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:18,496 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:18,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 09:16:18,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:18,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:16:18,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:16:18,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:16:18,521 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-10-27 09:16:19,294 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-10-27 09:16:20,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:20,766 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-10-27 09:16:20,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:16:20,775 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-10-27 09:16:20,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:20,776 INFO L225 Difference]: With dead ends: 102 [2018-10-27 09:16:20,776 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 09:16:20,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 09:16:20,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 09:16:20,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-27 09:16:20,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 09:16:20,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-10-27 09:16:20,801 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-10-27 09:16:20,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:20,801 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-10-27 09:16:20,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:16:20,802 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-10-27 09:16:20,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 09:16:20,807 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:20,808 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:20,808 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:20,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:20,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-10-27 09:16:20,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:20,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:20,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,810 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:20,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:21,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:21,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:21,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:21,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:21,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:21,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:21,442 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 09:16:21,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:21,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:21,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:21,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:21,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:21,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:23,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:23,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:23,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 09:16:23,288 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:23,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 09:16:23,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 09:16:23,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 09:16:23,290 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-10-27 09:16:25,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:25,586 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-10-27 09:16:25,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:16:25,587 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-10-27 09:16:25,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:25,588 INFO L225 Difference]: With dead ends: 111 [2018-10-27 09:16:25,588 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 09:16:25,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 09:16:25,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 09:16:25,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-27 09:16:25,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-27 09:16:25,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-10-27 09:16:25,605 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-10-27 09:16:25,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:25,606 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-10-27 09:16:25,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 09:16:25,606 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-10-27 09:16:25,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-27 09:16:25,608 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:25,608 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:25,609 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:25,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:25,609 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-10-27 09:16:25,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:25,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:25,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,612 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:25,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:26,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:26,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:26,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:26,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:26,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:26,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:26,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 09:16:26,343 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:26,343 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:26,376 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 09:16:26,377 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:26,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:26,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:26,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:28,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:28,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:28,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 09:16:28,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:28,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:16:28,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:16:28,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 09:16:28,418 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-10-27 09:16:28,662 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-10-27 09:16:31,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:31,127 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-10-27 09:16:31,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:16:31,128 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-10-27 09:16:31,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:31,129 INFO L225 Difference]: With dead ends: 120 [2018-10-27 09:16:31,129 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 09:16:31,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 09:16:31,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 09:16:31,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-27 09:16:31,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 09:16:31,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-10-27 09:16:31,140 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-10-27 09:16:31,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:31,141 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-10-27 09:16:31,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:16:31,141 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-10-27 09:16:31,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 09:16:31,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:31,143 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:31,143 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:31,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:31,143 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-10-27 09:16:31,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:31,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:31,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:31,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:31,145 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:31,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:32,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:32,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:32,057 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:32,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:32,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:32,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:32,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:32,066 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:32,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:32,133 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:32,134 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:32,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:32,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:32,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:34,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:34,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:34,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 09:16:34,931 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:34,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 09:16:34,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 09:16:34,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 09:16:34,934 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-10-27 09:16:38,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:38,277 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-10-27 09:16:38,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 09:16:38,278 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-10-27 09:16:38,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:38,279 INFO L225 Difference]: With dead ends: 129 [2018-10-27 09:16:38,279 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 09:16:38,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 09:16:38,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 09:16:38,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-27 09:16:38,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-27 09:16:38,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-10-27 09:16:38,290 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-10-27 09:16:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:38,290 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-10-27 09:16:38,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 09:16:38,290 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-10-27 09:16:38,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-27 09:16:38,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:38,292 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:38,292 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:38,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:38,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-10-27 09:16:38,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:38,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:38,293 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:38,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:38,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:38,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:39,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:39,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:39,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:39,276 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:39,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:39,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:39,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:39,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:39,284 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:39,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:39,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:39,566 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:39,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:41,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:41,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:41,944 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 09:16:41,944 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:41,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:16:41,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:16:41,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 09:16:41,946 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-10-27 09:16:45,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:45,913 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-10-27 09:16:45,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:16:45,914 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-10-27 09:16:45,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:45,915 INFO L225 Difference]: With dead ends: 138 [2018-10-27 09:16:45,915 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 09:16:45,921 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 09:16:45,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 09:16:45,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-27 09:16:45,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-27 09:16:45,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-10-27 09:16:45,926 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-10-27 09:16:45,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:45,927 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-10-27 09:16:45,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:16:45,927 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-10-27 09:16:45,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-27 09:16:45,927 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:45,927 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:45,928 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:45,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:45,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-10-27 09:16:45,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:45,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:45,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:45,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:45,929 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:46,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:47,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:47,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:47,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:47,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:47,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:47,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:47,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:47,022 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:47,023 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:47,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-27 09:16:47,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:47,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:47,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:47,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:49,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:49,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:49,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 09:16:49,979 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:49,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 09:16:49,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 09:16:49,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 09:16:49,981 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-10-27 09:16:54,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:54,333 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-27 09:16:54,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 09:16:54,333 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-10-27 09:16:54,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:54,335 INFO L225 Difference]: With dead ends: 147 [2018-10-27 09:16:54,335 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 09:16:54,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 09:16:54,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 09:16:54,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-27 09:16:54,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-27 09:16:54,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-10-27 09:16:54,343 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-10-27 09:16:54,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:54,343 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-10-27 09:16:54,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 09:16:54,344 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-10-27 09:16:54,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-10-27 09:16:54,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:54,345 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:54,345 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:54,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:54,345 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-10-27 09:16:54,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:54,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:54,346 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:54,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:54,346 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:54,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:55,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:55,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:55,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:55,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:55,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:55,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:55,986 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:55,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:56,032 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:56,033 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:56,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:56,190 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:56,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:59,250 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:59,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:59,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 09:16:59,272 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:59,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 09:16:59,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 09:16:59,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 09:16:59,273 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-10-27 09:17:04,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:04,285 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-10-27 09:17:04,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 09:17:04,286 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-10-27 09:17:04,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:04,287 INFO L225 Difference]: With dead ends: 156 [2018-10-27 09:17:04,288 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 09:17:04,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-10-27 09:17:04,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 09:17:04,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-27 09:17:04,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-27 09:17:04,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-10-27 09:17:04,295 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-10-27 09:17:04,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:04,296 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-10-27 09:17:04,296 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 09:17:04,296 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-10-27 09:17:04,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 09:17:04,297 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:04,297 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:04,297 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:04,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:04,297 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-10-27 09:17:04,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:04,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:04,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:04,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:04,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:04,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:05,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:05,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:05,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:05,609 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:05,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:05,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:05,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:05,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:05,619 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:05,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:06,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:06,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:09,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:09,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:09,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 09:17:09,324 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:09,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 09:17:09,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 09:17:09,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 09:17:09,326 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-10-27 09:17:09,597 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 8 [2018-10-27 09:17:09,733 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-10-27 09:17:15,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:15,247 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-10-27 09:17:15,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 09:17:15,248 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-10-27 09:17:15,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:15,249 INFO L225 Difference]: With dead ends: 165 [2018-10-27 09:17:15,249 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 09:17:15,250 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 09:17:15,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 09:17:15,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-10-27 09:17:15,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-27 09:17:15,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-10-27 09:17:15,257 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-10-27 09:17:15,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:15,257 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-10-27 09:17:15,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 09:17:15,257 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-10-27 09:17:15,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-27 09:17:15,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:15,258 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:15,258 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:15,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:15,259 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-10-27 09:17:15,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:15,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:15,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:15,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:15,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:15,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:16,857 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:16,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:16,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:16,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:16,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:16,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:16,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:16,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:16,866 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:16,918 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-27 09:17:16,919 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:16,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:17,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:17,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:20,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:20,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:20,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 09:17:20,664 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:20,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 09:17:20,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 09:17:20,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 09:17:20,666 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-10-27 09:17:21,055 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-10-27 09:17:21,185 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:17:21,319 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:17:21,452 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:17:21,591 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 09:17:21,883 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-27 09:17:27,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:27,157 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-10-27 09:17:27,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 09:17:27,159 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-10-27 09:17:27,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:27,160 INFO L225 Difference]: With dead ends: 174 [2018-10-27 09:17:27,160 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 09:17:27,162 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-10-27 09:17:27,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 09:17:27,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-27 09:17:27,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 09:17:27,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-10-27 09:17:27,168 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-10-27 09:17:27,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:27,168 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-10-27 09:17:27,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 09:17:27,168 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-10-27 09:17:27,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-27 09:17:27,169 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:27,169 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:27,169 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:27,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:27,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-10-27 09:17:27,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:27,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:27,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:27,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:27,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:27,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:28,815 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:28,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:28,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:28,816 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:28,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:28,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:28,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:28,824 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:28,824 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:28,941 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:28,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:28,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:29,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:29,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:33,080 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:33,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:33,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 09:17:33,102 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:33,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 09:17:33,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 09:17:33,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 09:17:33,104 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-10-27 09:17:33,271 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-10-27 09:17:33,402 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-10-27 09:17:33,540 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-10-27 09:17:33,684 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:17:33,833 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:17:33,979 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:17:34,133 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:17:34,284 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:17:34,436 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:17:40,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:40,605 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-10-27 09:17:40,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 09:17:40,606 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-10-27 09:17:40,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:40,607 INFO L225 Difference]: With dead ends: 183 [2018-10-27 09:17:40,607 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 09:17:40,608 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-10-27 09:17:40,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 09:17:40,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-10-27 09:17:40,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-27 09:17:40,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-10-27 09:17:40,616 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-10-27 09:17:40,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:40,616 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-10-27 09:17:40,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 09:17:40,616 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-10-27 09:17:40,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-27 09:17:40,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:40,618 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:40,618 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:40,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:40,618 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-10-27 09:17:40,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:40,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:40,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:40,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:40,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:40,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:42,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:42,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:42,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:42,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:42,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:42,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:42,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:42,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:42,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:42,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:42,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:43,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:43,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:47,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:47,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 09:17:47,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:47,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 09:17:47,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 09:17:47,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 09:17:47,558 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-10-27 09:17:47,766 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-10-27 09:17:47,897 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-10-27 09:17:48,045 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-10-27 09:17:48,200 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:17:48,356 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:17:48,516 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:17:48,672 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:17:48,839 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:17:49,004 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:17:49,169 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:17:49,340 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:17:49,518 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:17:49,876 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-27 09:17:56,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:56,142 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-10-27 09:17:56,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 09:17:56,143 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-10-27 09:17:56,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:56,145 INFO L225 Difference]: With dead ends: 192 [2018-10-27 09:17:56,145 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 09:17:56,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-10-27 09:17:56,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 09:17:56,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-27 09:17:56,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 09:17:56,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-10-27 09:17:56,154 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-10-27 09:17:56,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:56,155 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-10-27 09:17:56,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 09:17:56,155 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-10-27 09:17:56,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 09:17:56,156 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:56,156 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:56,156 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:56,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:56,157 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-10-27 09:17:56,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:56,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:56,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:56,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:56,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:56,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:58,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:58,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:58,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:58,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:58,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:58,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:58,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:58,219 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:58,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:58,356 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-10-27 09:17:58,357 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:58,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:58,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:58,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:03,406 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:03,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:03,436 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 09:18:03,436 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:03,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 09:18:03,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 09:18:03,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 09:18:03,440 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-10-27 09:18:03,691 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-10-27 09:18:03,829 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-10-27 09:18:03,989 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-10-27 09:18:04,151 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:18:04,321 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:18:04,497 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:18:04,676 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:18:04,866 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:18:05,047 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:18:05,231 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:18:05,414 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:18:05,599 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:18:05,787 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:18:05,976 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:18:06,183 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:18:06,373 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 09:18:13,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:13,316 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-10-27 09:18:13,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 09:18:13,318 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-10-27 09:18:13,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:13,320 INFO L225 Difference]: With dead ends: 201 [2018-10-27 09:18:13,320 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 09:18:13,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-10-27 09:18:13,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 09:18:13,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-10-27 09:18:13,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-27 09:18:13,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-10-27 09:18:13,328 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-10-27 09:18:13,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:13,329 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-10-27 09:18:13,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 09:18:13,329 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-10-27 09:18:13,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-27 09:18:13,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:13,330 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:13,330 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:13,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:13,331 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-10-27 09:18:13,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:13,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:13,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:13,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:13,332 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:16,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:16,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:16,123 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:16,123 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:16,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:16,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:16,123 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:16,131 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:18:16,131 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:18:16,351 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:18:16,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:16,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:16,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:16,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:21,952 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:21,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:21,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 09:18:21,975 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:21,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 09:18:21,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 09:18:21,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 09:18:21,976 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-10-27 09:18:22,190 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-10-27 09:18:22,340 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-10-27 09:18:22,517 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-10-27 09:18:22,691 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 09:18:22,873 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 09:18:23,058 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 09:18:23,237 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:18:23,426 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:18:23,611 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:18:23,806 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:18:24,012 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:18:24,214 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:18:24,411 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:18:24,609 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:18:24,810 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:18:25,023 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:18:25,220 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:18:25,557 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:18:25,759 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 09:18:32,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:32,934 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-10-27 09:18:32,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 09:18:32,935 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-10-27 09:18:32,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:32,937 INFO L225 Difference]: With dead ends: 210 [2018-10-27 09:18:32,937 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 09:18:32,939 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-10-27 09:18:32,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 09:18:32,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-10-27 09:18:32,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-27 09:18:32,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-10-27 09:18:32,947 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-10-27 09:18:32,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:32,947 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-10-27 09:18:32,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 09:18:32,947 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-10-27 09:18:32,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 09:18:32,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:32,949 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:32,949 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:32,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:32,949 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-10-27 09:18:32,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:32,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:32,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:32,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:32,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:33,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:35,552 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:35,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:35,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:35,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:35,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:35,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:35,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:35,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:35,562 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:18:35,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:36,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:36,398 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:36,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:42,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:42,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:42,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 09:18:42,127 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:42,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 09:18:42,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 09:18:42,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 09:18:42,129 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-10-27 09:18:42,354 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-10-27 09:18:42,509 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-10-27 09:18:42,690 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-10-27 09:18:42,876 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 09:18:43,068 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 09:18:43,266 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 09:18:43,462 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 09:18:43,671 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 09:18:43,870 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 09:18:44,080 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:18:44,295 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:18:44,510 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:18:44,719 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:18:44,928 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:18:45,143 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:18:45,356 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:18:45,570 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:18:45,791 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:18:46,011 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:18:46,229 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:18:49,667 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-10-27 09:18:54,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:54,368 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-10-27 09:18:54,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 09:18:54,370 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-10-27 09:18:54,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:54,371 INFO L225 Difference]: With dead ends: 219 [2018-10-27 09:18:54,372 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 09:18:54,373 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-10-27 09:18:54,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 09:18:54,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-10-27 09:18:54,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-27 09:18:54,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-10-27 09:18:54,381 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-10-27 09:18:54,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:54,382 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-10-27 09:18:54,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 09:18:54,382 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-10-27 09:18:54,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-27 09:18:54,383 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:54,383 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:54,383 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:54,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:54,384 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-10-27 09:18:54,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:54,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:54,385 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:54,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:54,385 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:54,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:57,009 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:57,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:57,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:57,010 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:57,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:57,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:57,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:57,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:18:57,017 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:18:57,198 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-10-27 09:18:57,198 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:57,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:57,445 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:57,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:03,860 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:03,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:03,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 09:19:03,881 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:03,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 09:19:03,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 09:19:03,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 09:19:03,882 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-10-27 09:19:04,650 WARN L179 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-10-27 09:19:04,818 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-10-27 09:19:05,016 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-10-27 09:19:05,212 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 09:19:05,419 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 09:19:05,630 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 09:19:05,840 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 09:19:06,059 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 09:19:06,279 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 09:19:06,499 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 09:19:06,731 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 09:19:06,956 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 09:19:07,172 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:19:07,416 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:19:07,643 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:19:07,875 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:19:08,099 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:19:08,335 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:19:08,568 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:19:08,806 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:19:09,041 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:19:09,275 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:19:09,510 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:19:09,745 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:19:09,975 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-27 09:19:18,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:18,223 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-10-27 09:19:18,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 09:19:18,226 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-10-27 09:19:18,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:18,227 INFO L225 Difference]: With dead ends: 228 [2018-10-27 09:19:18,228 INFO L226 Difference]: Without dead ends: 223 [2018-10-27 09:19:18,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-10-27 09:19:18,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-27 09:19:18,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-10-27 09:19:18,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-27 09:19:18,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-10-27 09:19:18,237 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-10-27 09:19:18,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:18,238 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-10-27 09:19:18,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 09:19:18,238 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-10-27 09:19:18,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 09:19:18,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:18,239 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:18,239 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:18,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:18,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-10-27 09:19:18,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:18,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:18,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:18,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:18,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:18,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:21,243 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:21,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:21,243 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:21,243 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:21,243 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:21,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:21,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:21,254 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:19:21,254 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:19:21,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:19:21,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:21,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:22,179 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:22,179 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:29,056 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:29,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:29,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-27 09:19:29,077 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:29,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-27 09:19:29,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-27 09:19:29,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 09:19:29,079 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-10-27 09:19:29,419 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-10-27 09:19:29,595 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-10-27 09:19:29,809 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-10-27 09:19:30,032 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-27 09:19:30,244 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-27 09:19:30,470 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-27 09:19:30,698 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 09:19:30,929 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 09:19:31,151 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 09:19:31,381 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 09:19:31,626 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 09:19:31,866 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 09:19:32,110 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 09:19:32,350 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 09:19:32,597 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 09:19:32,845 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:19:33,101 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:19:33,347 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:19:33,591 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:19:33,838 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:19:34,090 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:19:34,341 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:19:34,588 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:19:34,848 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:19:35,097 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:19:35,347 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:19:35,595 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-27 09:19:44,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:44,262 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-10-27 09:19:44,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-27 09:19:44,262 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-10-27 09:19:44,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:44,264 INFO L225 Difference]: With dead ends: 237 [2018-10-27 09:19:44,264 INFO L226 Difference]: Without dead ends: 232 [2018-10-27 09:19:44,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-10-27 09:19:44,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-27 09:19:44,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-10-27 09:19:44,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-10-27 09:19:44,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-10-27 09:19:44,275 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-10-27 09:19:44,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:44,276 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-10-27 09:19:44,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-27 09:19:44,276 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-10-27 09:19:44,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-10-27 09:19:44,277 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:44,277 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:44,278 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:44,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:44,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-10-27 09:19:44,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:44,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:44,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:44,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:44,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:44,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:48,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:48,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:48,205 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:48,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:48,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:48,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:48,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:48,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:19:48,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:49,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:49,338 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:49,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:56,658 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:56,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:56,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-10-27 09:19:56,679 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:56,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-27 09:19:56,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-27 09:19:56,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-10-27 09:19:56,681 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-10-27 09:19:56,947 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-10-27 09:19:57,150 WARN L179 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-10-27 09:19:57,368 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-10-27 09:19:57,590 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-10-27 09:19:57,817 WARN L179 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-10-27 09:19:58,054 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-10-27 09:19:58,287 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-27 09:19:58,529 WARN L179 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-27 09:19:58,769 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-27 09:19:59,019 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-27 09:19:59,760 WARN L179 SmtUtils]: Spent 407.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-27 09:20:00,050 WARN L179 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-27 09:20:00,318 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-27 09:20:00,695 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-27 09:20:00,967 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-27 09:20:01,240 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-27 09:20:01,508 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-27 09:20:01,791 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-27 09:20:02,058 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-27 09:20:02,338 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-27 09:20:02,608 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-27 09:20:02,873 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-27 09:20:03,141 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-27 09:20:03,422 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-27 09:20:03,695 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-27 09:20:03,957 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-27 09:20:04,226 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-27 09:20:04,492 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-27 09:20:04,759 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-27 09:20:05,017 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 Received shutdown request... [2018-10-27 09:20:06,006 WARN L187 SmtUtils]: Removed 9 from assertion stack [2018-10-27 09:20:06,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:20:06,007 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:20:06,011 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:20:06,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:20:06 BoogieIcfgContainer [2018-10-27 09:20:06,011 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:20:06,012 INFO L168 Benchmark]: Toolchain (without parser) took 249074.30 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 662.7 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -214.1 MB). Peak memory consumption was 448.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,013 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,013 INFO L168 Benchmark]: CACSL2BoogieTranslator took 316.95 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,013 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,013 INFO L168 Benchmark]: Boogie Preprocessor took 32.82 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,014 INFO L168 Benchmark]: RCFGBuilder took 359.29 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 720.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -776.4 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,014 INFO L168 Benchmark]: TraceAbstraction took 248327.49 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -58.2 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 551.7 MB). Peak memory consumption was 493.5 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,016 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 316.95 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.82 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 359.29 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 720.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -776.4 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 248327.49 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -58.2 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 551.7 MB). Peak memory consumption was 493.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 35 states, 79 states before enhancement),while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 137. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 248.2s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 130.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3883 SDslu, 8679 SDs, 0 SdLazy, 4055 SolverSat, 2427 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8091 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2886 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28616 ImplicationChecksByTransitivity, 225.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.7s SatisfiabilityAnalysisTime, 109.4s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown