java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:05:08,149 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:05:08,153 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:05:08,167 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:05:08,167 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:05:08,169 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:05:08,170 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:05:08,172 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:05:08,174 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:05:08,174 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:05:08,175 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:05:08,176 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:05:08,177 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:05:08,178 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:05:08,179 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:05:08,180 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:05:08,181 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:05:08,183 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:05:08,185 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:05:08,186 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:05:08,188 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:05:08,189 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:05:08,194 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:05:08,194 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:05:08,194 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:05:08,196 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:05:08,200 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:05:08,201 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:05:08,202 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:05:08,206 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:05:08,206 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:05:08,207 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 04:05:08,207 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 04:05:08,207 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 04:05:08,208 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 04:05:08,212 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 04:05:08,213 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:05:08,242 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:05:08,242 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:05:08,243 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:05:08,244 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:05:08,244 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:05:08,244 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:05:08,244 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:05:08,245 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:05:08,245 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:05:08,245 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:05:08,245 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:05:08,245 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:05:08,246 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:05:08,246 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:05:08,247 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:05:08,248 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:05:08,248 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:05:08,248 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:05:08,248 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:05:08,248 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:05:08,250 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:05:08,250 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:05:08,250 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:05:08,250 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:05:08,251 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:08,251 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:05:08,251 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:05:08,251 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:05:08,251 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:05:08,252 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:05:08,252 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:05:08,252 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:05:08,252 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:05:08,252 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:05:08,310 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:05:08,323 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:05:08,326 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:05:08,328 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:05:08,328 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:05:08,329 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-27 04:05:08,387 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/180b7f78a/492598450e8748ecb30ebe2a573cc9f1/FLAGaad529f23 [2018-10-27 04:05:08,857 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:05:08,858 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-27 04:05:08,865 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/180b7f78a/492598450e8748ecb30ebe2a573cc9f1/FLAGaad529f23 [2018-10-27 04:05:08,880 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/180b7f78a/492598450e8748ecb30ebe2a573cc9f1 [2018-10-27 04:05:08,892 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:05:08,894 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:05:08,895 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:08,895 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:05:08,899 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:05:08,900 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:08" (1/1) ... [2018-10-27 04:05:08,903 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ffc4243 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:08, skipping insertion in model container [2018-10-27 04:05:08,903 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:08" (1/1) ... [2018-10-27 04:05:08,913 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:05:08,934 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:05:09,116 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:09,120 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:05:09,137 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:09,153 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:05:09,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09 WrapperNode [2018-10-27 04:05:09,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:09,155 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:09,155 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:05:09,155 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:05:09,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,172 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,178 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:09,179 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:05:09,179 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:05:09,179 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:05:09,189 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,190 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,190 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,199 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,200 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... [2018-10-27 04:05:09,202 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:05:09,202 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:05:09,202 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:05:09,203 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:05:09,204 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:09,272 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:05:09,273 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:05:09,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:05:09,273 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:05:09,273 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:05:09,273 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:05:09,274 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:05:09,274 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:05:09,555 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:05:09,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:09 BoogieIcfgContainer [2018-10-27 04:05:09,556 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:05:09,557 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:05:09,558 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:05:09,563 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:05:09,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:05:08" (1/3) ... [2018-10-27 04:05:09,564 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24fea81d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:09, skipping insertion in model container [2018-10-27 04:05:09,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:09" (2/3) ... [2018-10-27 04:05:09,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24fea81d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:09, skipping insertion in model container [2018-10-27 04:05:09,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:09" (3/3) ... [2018-10-27 04:05:09,567 INFO L112 eAbstractionObserver]: Analyzing ICFG const_false-unreach-call1.i [2018-10-27 04:05:09,579 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:05:09,587 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:05:09,603 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:05:09,637 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:05:09,637 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:05:09,637 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:05:09,637 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:05:09,637 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:05:09,638 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:05:09,638 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:05:09,638 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:05:09,658 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-27 04:05:09,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 04:05:09,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:09,666 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:09,669 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:09,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:09,676 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-27 04:05:09,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:09,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:09,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,734 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:09,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:09,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:09,804 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:09,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:05:09,805 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:09,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:05:09,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:05:09,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:05:09,825 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-27 04:05:09,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:09,850 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 04:05:09,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:05:09,852 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 04:05:09,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:09,861 INFO L225 Difference]: With dead ends: 29 [2018-10-27 04:05:09,862 INFO L226 Difference]: Without dead ends: 12 [2018-10-27 04:05:09,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:05:09,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-27 04:05:09,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-27 04:05:09,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-27 04:05:09,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-27 04:05:09,907 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-27 04:05:09,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:09,907 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-27 04:05:09,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:05:09,908 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-27 04:05:09,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:05:09,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:09,909 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:09,909 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:09,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:09,910 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-27 04:05:09,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:09,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:09,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:09,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:10,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:10,051 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:10,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:05:10,051 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:10,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:05:10,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:05:10,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:10,055 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-27 04:05:10,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:10,115 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-27 04:05:10,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:05:10,116 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 04:05:10,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:10,118 INFO L225 Difference]: With dead ends: 19 [2018-10-27 04:05:10,118 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 04:05:10,122 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:10,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 04:05:10,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 04:05:10,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 04:05:10,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 04:05:10,130 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 04:05:10,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:10,130 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 04:05:10,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:05:10,131 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 04:05:10,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 04:05:10,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:10,132 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:10,137 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:10,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:10,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-27 04:05:10,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:10,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,139 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:10,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,140 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:10,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:10,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:10,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:10,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:10,263 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-27 04:05:10,265 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-27 04:05:10,311 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:05:10,312 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:05:10,493 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:05:10,760 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:05:10,762 INFO L272 AbstractInterpreter]: Visited 12 different actions 81 times. Merged at 3 different actions 31 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 04:05:10,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:10,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:05:10,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:10,779 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 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:10,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:10,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:10,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:10,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:10,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:10,889 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:11,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:11,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 04:05:11,048 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:11,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 04:05:11,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 04:05:11,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:05:11,049 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-27 04:05:11,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:11,066 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 04:05:11,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:05:11,067 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 04:05:11,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:11,067 INFO L225 Difference]: With dead ends: 21 [2018-10-27 04:05:11,067 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 04:05:11,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:05:11,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 04:05:11,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 04:05:11,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 04:05:11,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 04:05:11,073 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-27 04:05:11,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:11,073 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 04:05:11,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 04:05:11,073 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 04:05:11,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 04:05:11,074 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:11,074 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:11,074 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:11,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:11,075 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-27 04:05:11,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:11,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:11,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,076 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:11,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:11,270 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:11,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:11,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:11,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:11,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:11,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:11,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:05:11,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:11,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:11,372 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:11,653 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:11,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 04:05:11,676 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:11,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:05:11,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:05:11,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:05:11,678 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-27 04:05:11,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:11,712 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 04:05:11,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:05:11,712 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-27 04:05:11,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:11,713 INFO L225 Difference]: With dead ends: 23 [2018-10-27 04:05:11,713 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 04:05:11,714 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:05:11,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 04:05:11,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 04:05:11,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:05:11,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 04:05:11,719 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-27 04:05:11,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:11,719 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 04:05:11,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:05:11,720 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 04:05:11,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:05:11,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:11,721 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:11,721 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:11,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:11,722 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-27 04:05:11,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:11,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:11,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,723 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:11,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:11,838 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:11,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:11,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:11,847 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:11,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:11,865 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:11,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:11,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:11,887 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:11,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:12,170 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:12,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:12,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 04:05:12,193 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:12,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:05:12,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:05:12,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:05:12,194 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-27 04:05:12,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:12,258 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-27 04:05:12,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:05:12,259 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-27 04:05:12,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:12,260 INFO L225 Difference]: With dead ends: 25 [2018-10-27 04:05:12,260 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 04:05:12,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:05:12,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 04:05:12,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 04:05:12,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 04:05:12,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 04:05:12,266 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-27 04:05:12,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:12,266 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 04:05:12,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:05:12,267 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 04:05:12,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 04:05:12,267 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:12,267 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:12,268 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:12,268 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:12,268 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-27 04:05:12,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:12,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:12,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:12,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:12,270 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:12,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:12,441 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:12,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:12,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:12,442 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:12,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:12,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:12,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:12,455 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:12,455 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:12,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:12,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:12,486 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:12,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:13,476 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:13,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:13,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 04:05:13,499 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:13,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:05:13,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:05:13,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:05:13,503 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-27 04:05:13,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:13,577 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 04:05:13,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:05:13,578 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 04:05:13,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:13,579 INFO L225 Difference]: With dead ends: 27 [2018-10-27 04:05:13,579 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 04:05:13,580 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:05:13,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 04:05:13,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-27 04:05:13,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 04:05:13,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-27 04:05:13,586 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-27 04:05:13,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:13,586 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-27 04:05:13,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:05:13,586 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-27 04:05:13,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 04:05:13,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:13,587 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:13,588 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:13,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:13,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-27 04:05:13,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:13,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:13,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:13,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:13,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:13,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:13,738 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:13,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:13,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:13,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:13,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:13,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:13,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:13,748 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:13,748 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:13,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:05:13,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:13,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:13,877 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:13,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:14,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:14,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:05:14,501 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:14,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:05:14,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:05:14,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:05:14,502 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-27 04:05:14,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:14,576 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-27 04:05:14,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:05:14,579 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 04:05:14,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:14,580 INFO L225 Difference]: With dead ends: 29 [2018-10-27 04:05:14,580 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 04:05:14,581 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:05:14,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 04:05:14,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 04:05:14,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 04:05:14,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 04:05:14,586 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-27 04:05:14,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:14,586 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 04:05:14,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:05:14,587 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 04:05:14,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 04:05:14,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:14,588 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:14,588 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:14,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:14,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-27 04:05:14,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:14,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:14,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:14,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:14,590 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:14,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:14,796 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:14,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:14,797 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:14,797 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:14,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:14,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:14,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:05:14,808 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:14,808 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:14,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:14,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:14,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:14,847 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:14,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:15,393 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:15,426 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:15,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 04:05:15,426 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:15,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:05:15,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:05:15,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:05:15,428 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 04:05:15,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:15,507 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-27 04:05:15,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 04:05:15,508 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 04:05:15,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:15,509 INFO L225 Difference]: With dead ends: 31 [2018-10-27 04:05:15,509 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 04:05:15,509 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:05:15,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 04:05:15,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 04:05:15,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 04:05:15,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 04:05:15,514 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-27 04:05:15,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:15,515 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 04:05:15,515 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:05:15,515 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 04:05:15,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 04:05:15,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:15,516 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:15,516 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:15,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:15,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-27 04:05:15,517 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:15,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:15,518 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:15,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:15,518 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:15,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:15,852 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:15,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:15,853 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:15,853 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:15,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:15,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:15,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:15,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:15,863 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:15,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:15,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:15,903 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:15,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:19,519 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:19,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:19,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 04:05:19,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:19,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:05:19,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:05:19,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:05:19,543 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-27 04:05:19,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:19,702 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 04:05:19,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:05:19,703 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-27 04:05:19,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:19,704 INFO L225 Difference]: With dead ends: 33 [2018-10-27 04:05:19,704 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 04:05:19,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:05:19,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 04:05:19,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-27 04:05:19,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 04:05:19,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-27 04:05:19,709 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-27 04:05:19,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:19,709 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-27 04:05:19,710 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:05:19,710 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-27 04:05:19,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 04:05:19,711 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:19,711 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:19,711 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:19,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:19,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-27 04:05:19,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:19,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:19,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:19,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:19,713 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:19,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:19,976 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:19,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:19,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:19,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:19,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:19,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:19,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:19,987 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:19,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:20,026 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:05:20,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:20,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:20,045 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:20,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:30,935 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 66 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:30,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:30,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:05:30,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:30,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:05:30,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:05:30,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=258, Unknown=4, NotChecked=0, Total=380 [2018-10-27 04:05:30,959 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-27 04:05:31,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:31,056 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-27 04:05:31,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:05:31,057 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-27 04:05:31,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:31,058 INFO L225 Difference]: With dead ends: 35 [2018-10-27 04:05:31,059 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 04:05:31,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=118, Invalid=258, Unknown=4, NotChecked=0, Total=380 [2018-10-27 04:05:31,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 04:05:31,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-27 04:05:31,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 04:05:31,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 04:05:31,065 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-27 04:05:31,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:31,065 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 04:05:31,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:05:31,066 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 04:05:31,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 04:05:31,066 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:31,067 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:31,067 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:31,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:31,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-27 04:05:31,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:31,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:31,069 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:31,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:31,069 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:31,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:31,267 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:31,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:31,268 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:31,268 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:31,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:31,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:31,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:31,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:31,277 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:31,291 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:31,292 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:31,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:31,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:33,343 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:33,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:33,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 04:05:33,365 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:33,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:05:33,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:05:33,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:05:33,366 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-27 04:05:33,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:33,537 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-27 04:05:33,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:05:33,540 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-27 04:05:33,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:33,541 INFO L225 Difference]: With dead ends: 37 [2018-10-27 04:05:33,541 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 04:05:33,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:05:33,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 04:05:33,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-27 04:05:33,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 04:05:33,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 04:05:33,546 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-27 04:05:33,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:33,547 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 04:05:33,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:05:33,547 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 04:05:33,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 04:05:33,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:33,548 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:33,548 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:33,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:33,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-27 04:05:33,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:33,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:33,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:33,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:33,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:33,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:33,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:33,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:33,801 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:33,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:33,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:33,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:33,810 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:33,810 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:33,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:33,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:33,859 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:33,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:38,851 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:38,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:38,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 04:05:38,873 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:38,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:05:38,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:05:38,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-27 04:05:38,876 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-27 04:05:39,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:39,045 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 04:05:39,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:05:39,046 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-27 04:05:39,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:39,047 INFO L225 Difference]: With dead ends: 39 [2018-10-27 04:05:39,047 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 04:05:39,049 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-27 04:05:39,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 04:05:39,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 04:05:39,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 04:05:39,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 04:05:39,054 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-27 04:05:39,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:39,054 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 04:05:39,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:05:39,055 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 04:05:39,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 04:05:39,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:39,056 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:39,056 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:39,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:39,057 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-27 04:05:39,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:39,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:39,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:39,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:39,058 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:39,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:39,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:39,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:39,312 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:39,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:39,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:39,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:39,321 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:39,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:39,467 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:05:39,467 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:39,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:39,490 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:39,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:47,642 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 128 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:47,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:47,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 04:05:47,664 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:47,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:05:47,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:05:47,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=455, Unknown=2, NotChecked=0, Total=650 [2018-10-27 04:05:47,665 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-27 04:05:47,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:47,865 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-27 04:05:47,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:05:47,867 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-27 04:05:47,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:47,869 INFO L225 Difference]: With dead ends: 41 [2018-10-27 04:05:47,869 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 04:05:47,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=193, Invalid=455, Unknown=2, NotChecked=0, Total=650 [2018-10-27 04:05:47,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 04:05:47,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 04:05:47,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 04:05:47,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 04:05:47,874 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-27 04:05:47,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:47,874 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 04:05:47,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:05:47,875 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 04:05:47,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:05:47,875 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:47,876 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:47,876 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:47,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:47,876 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-27 04:05:47,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:47,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:47,877 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:47,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:47,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:47,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:48,230 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:48,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:48,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:48,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:48,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:48,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:48,231 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:48,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:48,240 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:48,255 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:48,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:48,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:48,273 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:48,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:55,264 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:55,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:55,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 04:05:55,284 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:55,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:05:55,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:05:55,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-27 04:05:55,285 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-27 04:05:55,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:55,476 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-27 04:05:55,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 04:05:55,477 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-27 04:05:55,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:55,478 INFO L225 Difference]: With dead ends: 43 [2018-10-27 04:05:55,478 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 04:05:55,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-27 04:05:55,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 04:05:55,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-27 04:05:55,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 04:05:55,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 04:05:55,490 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-27 04:05:55,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:55,490 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 04:05:55,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:05:55,490 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 04:05:55,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 04:05:55,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:55,491 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:55,492 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:55,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:55,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-27 04:05:55,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:55,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:55,494 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:55,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:55,494 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:55,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:56,192 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:56,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:56,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:56,192 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:56,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:56,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:56,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:56,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:56,202 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:56,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:56,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:56,264 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:56,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:06,388 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 180 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:06,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 04:06:06,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:06,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:06:06,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:06:06,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-27 04:06:06,412 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-27 04:06:06,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:06,705 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 04:06:06,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:06:06,705 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-27 04:06:06,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:06,706 INFO L225 Difference]: With dead ends: 45 [2018-10-27 04:06:06,707 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 04:06:06,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-27 04:06:06,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 04:06:06,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-27 04:06:06,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 04:06:06,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-27 04:06:06,712 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-27 04:06:06,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:06,713 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-27 04:06:06,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:06:06,713 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-27 04:06:06,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 04:06:06,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:06,714 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:06,714 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:06,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:06,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-27 04:06:06,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:06,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,715 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:06,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:06,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:07,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:07,020 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:07,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:07,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:07,034 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:07,034 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:07,153 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:06:07,154 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:07,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:07,185 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:07,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:19,157 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 208 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:19,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:19,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 04:06:19,179 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:19,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:06:19,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:06:19,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=704, Unknown=2, NotChecked=0, Total=992 [2018-10-27 04:06:19,180 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-27 04:06:19,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:19,360 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-27 04:06:19,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:06:19,361 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-27 04:06:19,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:19,362 INFO L225 Difference]: With dead ends: 47 [2018-10-27 04:06:19,362 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 04:06:19,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=286, Invalid=704, Unknown=2, NotChecked=0, Total=992 [2018-10-27 04:06:19,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 04:06:19,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-27 04:06:19,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 04:06:19,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 04:06:19,370 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-27 04:06:19,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:19,370 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 04:06:19,370 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:06:19,371 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 04:06:19,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 04:06:19,371 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:19,371 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:19,372 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:19,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:19,372 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-27 04:06:19,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:19,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:19,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:19,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:19,373 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:19,828 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:19,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:19,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:19,829 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:19,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:19,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:19,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:19,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:19,838 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:19,854 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:19,855 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:19,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:19,890 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:19,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:34,186 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:34,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:34,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 04:06:34,207 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:34,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:06:34,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:06:34,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=799, Unknown=2, NotChecked=0, Total=1122 [2018-10-27 04:06:34,209 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-27 04:06:34,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:34,464 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-27 04:06:34,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:06:34,465 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-27 04:06:34,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:34,466 INFO L225 Difference]: With dead ends: 49 [2018-10-27 04:06:34,466 INFO L226 Difference]: Without dead ends: 44 [2018-10-27 04:06:34,467 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=321, Invalid=799, Unknown=2, NotChecked=0, Total=1122 [2018-10-27 04:06:34,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-27 04:06:34,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-27 04:06:34,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 04:06:34,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 04:06:34,472 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-27 04:06:34,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:34,473 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 04:06:34,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:06:34,473 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 04:06:34,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 04:06:34,475 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:34,475 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:34,475 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:34,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:34,476 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-27 04:06:34,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:34,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:34,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:34,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:34,477 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:34,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:34,776 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:34,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:34,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:34,776 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:34,777 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:34,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:34,777 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:34,785 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:34,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:34,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:34,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:34,873 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:34,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:50,250 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 270 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:50,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:50,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 04:06:50,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:50,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:06:50,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:06:50,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-27 04:06:50,272 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-27 04:06:50,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:50,673 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 04:06:50,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:06:50,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-27 04:06:50,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:50,675 INFO L225 Difference]: With dead ends: 51 [2018-10-27 04:06:50,675 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 04:06:50,676 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-27 04:06:50,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 04:06:50,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-27 04:06:50,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 04:06:50,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-27 04:06:50,682 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-27 04:06:50,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:50,682 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-27 04:06:50,682 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:06:50,682 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-27 04:06:50,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 04:06:50,683 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:50,683 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:50,684 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:50,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:50,684 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-27 04:06:50,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:50,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:50,685 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:50,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:50,685 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:50,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:51,431 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:51,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:51,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:51,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:51,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:51,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:51,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:51,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:51,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:52,085 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 04:06:52,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:52,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:52,119 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:52,120 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:07,315 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 304 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:07,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:07,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 04:07:07,336 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:07,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:07:07,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:07:07,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1007, Unknown=2, NotChecked=0, Total=1406 [2018-10-27 04:07:07,337 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-27 04:07:07,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:07,935 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-27 04:07:07,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:07:07,936 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-27 04:07:07,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:07,936 INFO L225 Difference]: With dead ends: 53 [2018-10-27 04:07:07,937 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 04:07:07,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=397, Invalid=1007, Unknown=2, NotChecked=0, Total=1406 [2018-10-27 04:07:07,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 04:07:07,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 04:07:07,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 04:07:07,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 04:07:07,942 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-27 04:07:07,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:07,942 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 04:07:07,943 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:07:07,943 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 04:07:07,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 04:07:07,943 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:07,943 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:07,944 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:07,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:07,944 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-27 04:07:07,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:07,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:07,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:07,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:07,945 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:07,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:08,846 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:08,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:08,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:08,847 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:08,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:08,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:08,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:08,860 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:08,861 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:08,881 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:08,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:08,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:08,904 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:08,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:31,192 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:31,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:31,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 04:07:31,212 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:31,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:07:31,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:07:31,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1120, Unknown=2, NotChecked=0, Total=1560 [2018-10-27 04:07:31,213 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-27 04:07:31,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:31,485 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-27 04:07:31,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 04:07:31,485 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-27 04:07:31,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:31,486 INFO L225 Difference]: With dead ends: 55 [2018-10-27 04:07:31,487 INFO L226 Difference]: Without dead ends: 50 [2018-10-27 04:07:31,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=438, Invalid=1120, Unknown=2, NotChecked=0, Total=1560 [2018-10-27 04:07:31,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-27 04:07:31,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-27 04:07:31,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 04:07:31,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 04:07:31,493 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-27 04:07:31,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:31,493 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 04:07:31,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:07:31,493 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 04:07:31,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 04:07:31,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:31,494 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:31,494 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:31,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:31,495 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-27 04:07:31,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:31,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:31,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:31,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:31,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:31,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:31,900 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:31,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:31,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:31,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:31,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:31,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:31,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:31,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:31,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:31,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:31,946 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:31,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:59,533 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:59,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:59,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 04:07:59,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:59,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:07:59,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:07:59,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1239, Unknown=2, NotChecked=0, Total=1722 [2018-10-27 04:07:59,555 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-27 04:07:59,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:59,943 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 04:07:59,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:07:59,943 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-27 04:07:59,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:59,944 INFO L225 Difference]: With dead ends: 57 [2018-10-27 04:07:59,944 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 04:07:59,946 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=481, Invalid=1239, Unknown=2, NotChecked=0, Total=1722 [2018-10-27 04:07:59,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 04:07:59,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 04:07:59,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 04:07:59,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 04:07:59,951 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-27 04:07:59,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:59,952 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 04:07:59,952 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:07:59,952 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 04:07:59,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 04:07:59,953 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:59,953 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:59,953 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:59,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:59,954 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-27 04:07:59,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:59,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:59,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:59,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:59,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:59,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:00,456 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:00,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:00,456 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:00,457 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:00,457 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:00,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:00,457 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:00,465 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:00,465 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:08:14,328 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 04:08:14,328 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:14,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:14,445 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:14,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 418 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:45,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:45,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 04:08:45,744 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:45,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:08:45,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:08:45,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1363, Unknown=3, NotChecked=0, Total=1892 [2018-10-27 04:08:45,746 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-27 04:08:46,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:46,068 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-27 04:08:46,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:08:46,070 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-27 04:08:46,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:46,071 INFO L225 Difference]: With dead ends: 59 [2018-10-27 04:08:46,071 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 04:08:46,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.7s TimeCoverageRelationStatistics Valid=526, Invalid=1363, Unknown=3, NotChecked=0, Total=1892 [2018-10-27 04:08:46,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 04:08:46,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-27 04:08:46,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 04:08:46,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 04:08:46,077 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-27 04:08:46,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:46,077 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 04:08:46,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:08:46,078 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 04:08:46,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:08:46,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:46,078 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:46,078 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:46,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:46,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-27 04:08:46,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:46,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:46,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:46,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:46,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:46,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:46,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:46,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:46,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:46,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:46,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:46,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:46,499 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:46,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:46,534 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:46,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:46,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:46,566 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:46,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:14,482 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 456 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:14,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:14,503 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 04:09:14,503 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:14,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:09:14,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:09:14,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1493, Unknown=4, NotChecked=0, Total=2070 [2018-10-27 04:09:14,505 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-27 04:09:14,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:14,854 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-27 04:09:14,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 04:09:14,854 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-27 04:09:14,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:14,855 INFO L225 Difference]: With dead ends: 61 [2018-10-27 04:09:14,855 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 04:09:14,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=573, Invalid=1493, Unknown=4, NotChecked=0, Total=2070 [2018-10-27 04:09:14,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 04:09:14,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-27 04:09:14,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 04:09:14,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 04:09:14,862 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-27 04:09:14,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:14,862 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 04:09:14,862 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:09:14,862 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 04:09:14,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 04:09:14,863 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:14,863 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:14,863 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:14,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:14,864 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-27 04:09:14,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:14,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:14,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:09:14,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:14,865 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:14,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:16,102 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:16,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:16,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:16,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:16,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:16,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:16,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:16,110 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:16,110 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:09:16,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:16,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:16,154 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:16,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:42,956 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 504 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:42,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:42,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 04:09:42,979 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:42,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 04:09:42,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 04:09:42,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1632, Unknown=2, NotChecked=0, Total=2256 [2018-10-27 04:09:42,980 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-27 04:09:43,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:43,366 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 04:09:43,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:09:43,366 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-27 04:09:43,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:43,367 INFO L225 Difference]: With dead ends: 63 [2018-10-27 04:09:43,367 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 04:09:43,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=622, Invalid=1632, Unknown=2, NotChecked=0, Total=2256 [2018-10-27 04:09:43,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 04:09:43,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-27 04:09:43,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 04:09:43,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-27 04:09:43,373 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-27 04:09:43,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:43,374 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-27 04:09:43,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 04:09:43,374 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-27 04:09:43,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 04:09:43,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:43,375 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:43,375 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:43,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:43,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-27 04:09:43,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:43,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:43,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:43,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:43,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:43,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:43,827 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:43,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:43,828 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:43,828 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:43,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:43,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:43,828 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:43,837 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:09:43,837 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown