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/diamond_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:05:56,280 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:05:56,284 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:05:56,306 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:05:56,306 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:05:56,307 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:05:56,308 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:05:56,310 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:05:56,312 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:05:56,313 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:05:56,314 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:05:56,314 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:05:56,315 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:05:56,316 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:05:56,317 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:05:56,318 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:05:56,319 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:05:56,321 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:05:56,323 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:05:56,324 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:05:56,325 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:05:56,327 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:05:56,329 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:05:56,329 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:05:56,330 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:05:56,330 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:05:56,331 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:05:56,332 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:05:56,333 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:05:56,334 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:05:56,335 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:05:56,335 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 04:05:56,336 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 04:05:56,336 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 04:05:56,337 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 04:05:56,338 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 04:05:56,338 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 04:05:56,357 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:05:56,358 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:05:56,359 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:05:56,359 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:05:56,359 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:05:56,359 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:05:56,359 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:05:56,360 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:05:56,360 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:05:56,360 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:05:56,361 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:05:56,361 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:05:56,362 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:05:56,362 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:05:56,362 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:05:56,362 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:05:56,362 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:05:56,363 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:05:56,364 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:05:56,364 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:05:56,365 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:05:56,365 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:05:56,365 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:05:56,365 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:05:56,365 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:56,366 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:05:56,366 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:05:56,366 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:05:56,366 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:05:56,367 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:05:56,367 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:05:56,367 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:05:56,367 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:05:56,367 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:05:56,436 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:05:56,456 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:05:56,460 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:05:56,461 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:05:56,462 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:05:56,462 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-27 04:05:56,536 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2bbea5870/b129be25581d4e5d9a89d63735d598f6/FLAGee3667ad1 [2018-10-27 04:05:57,008 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:05:57,009 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-27 04:05:57,018 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2bbea5870/b129be25581d4e5d9a89d63735d598f6/FLAGee3667ad1 [2018-10-27 04:05:57,037 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2bbea5870/b129be25581d4e5d9a89d63735d598f6 [2018-10-27 04:05:57,051 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:05:57,053 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:05:57,054 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:57,054 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:05:57,058 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:05:57,059 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,062 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f77a5a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57, skipping insertion in model container [2018-10-27 04:05:57,062 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,073 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:05:57,095 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:05:57,295 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:57,300 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:05:57,318 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:57,336 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:05:57,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57 WrapperNode [2018-10-27 04:05:57,337 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:57,338 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:57,338 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:05:57,339 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:05:57,349 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,356 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,363 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:57,365 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:05:57,365 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:05:57,365 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:05:57,377 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,378 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,378 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,382 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,391 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,392 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... [2018-10-27 04:05:57,394 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:05:57,395 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:05:57,395 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:05:57,395 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:05:57,404 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:57,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:05:57,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:05:57,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:05:57,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:05:57,564 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:05:57,565 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:05:57,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:05:57,565 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:05:57,927 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:05:57,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:57 BoogieIcfgContainer [2018-10-27 04:05:57,928 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:05:57,929 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:05:57,929 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:05:57,932 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:05:57,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:05:57" (1/3) ... [2018-10-27 04:05:57,934 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65e6d49c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:57, skipping insertion in model container [2018-10-27 04:05:57,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:57" (2/3) ... [2018-10-27 04:05:57,934 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65e6d49c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:57, skipping insertion in model container [2018-10-27 04:05:57,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:57" (3/3) ... [2018-10-27 04:05:57,936 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_false-unreach-call1.i [2018-10-27 04:05:57,946 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:05:57,954 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:05:57,971 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:05:58,006 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:05:58,007 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:05:58,007 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:05:58,007 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:05:58,007 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:05:58,007 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:05:58,008 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:05:58,008 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:05:58,027 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-27 04:05:58,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 04:05:58,034 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:58,035 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:58,038 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:58,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:58,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-27 04:05:58,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:58,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:58,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,100 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:58,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:58,159 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 04:05:58,161 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:58,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:05:58,162 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:58,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:05:58,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:05:58,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:05:58,186 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-27 04:05:58,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:58,211 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-27 04:05:58,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:05:58,213 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 04:05:58,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:58,222 INFO L225 Difference]: With dead ends: 30 [2018-10-27 04:05:58,222 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 04:05:58,226 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 04:05:58,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 04:05:58,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 04:05:58,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 04:05:58,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-27 04:05:58,268 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-27 04:05:58,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:58,268 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-27 04:05:58,268 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:05:58,269 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-27 04:05:58,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:05:58,269 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:58,270 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:58,270 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:58,270 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:58,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-27 04:05:58,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:58,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:58,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,273 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:58,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:58,476 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 04:05:58,476 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:58,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:05:58,477 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:58,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:05:58,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:05:58,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:58,479 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-27 04:05:58,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:58,554 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-27 04:05:58,555 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:05:58,555 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 04:05:58,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:58,558 INFO L225 Difference]: With dead ends: 21 [2018-10-27 04:05:58,558 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 04:05:58,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:58,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 04:05:58,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-27 04:05:58,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 04:05:58,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-27 04:05:58,571 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-27 04:05:58,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:58,571 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-27 04:05:58,571 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:05:58,571 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-27 04:05:58,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 04:05:58,572 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:58,572 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:58,573 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:58,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:58,573 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-27 04:05:58,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:58,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,575 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:58,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:58,575 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:58,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:58,731 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 04:05:58,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:58,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:58,733 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 04:05:58,735 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 04:05:58,787 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:05:58,787 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:05:58,913 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:05:59,462 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:05:59,466 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-27 04:05:59,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:59,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:05:59,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:59,489 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 04:05:59,500 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:59,500 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:59,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:59,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:59,586 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 04:05:59,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:59,719 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 04:05:59,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:59,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 04:05:59,744 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:59,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 04:05:59,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 04:05:59,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:05:59,745 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-27 04:05:59,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:59,845 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-27 04:05:59,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:05:59,846 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 04:05:59,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:59,847 INFO L225 Difference]: With dead ends: 24 [2018-10-27 04:05:59,847 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 04:05:59,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 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 04:05:59,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 04:05:59,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-27 04:05:59,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:05:59,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-27 04:05:59,852 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-27 04:05:59,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:59,853 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-27 04:05:59,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 04:05:59,853 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-27 04:05:59,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 04:05:59,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:59,854 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:59,854 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:59,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:59,854 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-27 04:05:59,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:59,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:59,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:59,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:59,856 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:59,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:59,982 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 04:05:59,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:59,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:59,982 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 04:05:59,983 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 04:05:59,985 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:05:59,985 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:05:59,990 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:06:00,235 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:06:00,236 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-27 04:06:00,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:00,274 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:06:00,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:00,275 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 04:06:00,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:00,289 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:00,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:00,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:00,394 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 04:06:00,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:00,657 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 04:06:00,690 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:00,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 04:06:00,690 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:00,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 04:06:00,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 04:06:00,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:00,692 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-27 04:06:00,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:00,823 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-27 04:06:00,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:06:00,824 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 04:06:00,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:00,825 INFO L225 Difference]: With dead ends: 26 [2018-10-27 04:06:00,825 INFO L226 Difference]: Without dead ends: 21 [2018-10-27 04:06:00,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:00,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-27 04:06:00,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-27 04:06:00,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:06:00,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-27 04:06:00,831 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-27 04:06:00,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:00,831 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-27 04:06:00,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 04:06:00,831 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-27 04:06:00,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:06:00,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:00,832 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:00,833 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:00,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:00,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-27 04:06:00,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:00,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:00,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:00,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:00,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:00,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:01,104 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:01,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:01,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:01,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:01,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:01,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:01,105 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 04:06:01,114 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:01,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:01,167 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:06:01,168 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:01,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:01,212 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:01,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:01,318 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:01,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:01,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 04:06:01,339 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:01,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:06:01,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:06:01,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:01,340 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-27 04:06:01,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:01,505 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-27 04:06:01,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:06:01,508 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-27 04:06:01,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:01,509 INFO L225 Difference]: With dead ends: 29 [2018-10-27 04:06:01,509 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 04:06:01,510 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:01,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 04:06:01,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-27 04:06:01,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 04:06:01,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-27 04:06:01,515 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-27 04:06:01,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:01,515 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-27 04:06:01,515 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:06:01,516 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-27 04:06:01,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:06:01,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:01,517 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:01,517 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:01,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:01,517 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-27 04:06:01,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:01,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:01,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:01,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:01,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:01,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:01,680 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:01,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:01,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:01,680 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-27 04:06:01,680 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 04:06:01,682 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:06:01,683 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:06:01,687 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:06:01,887 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:06:01,888 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-10-27 04:06:01,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:01,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:06:01,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:01,927 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 04:06:01,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:01,943 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:01,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:01,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:02,238 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-10-27 04:06:02,258 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:02,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:02,371 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:02,395 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 04:06:02,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-27 04:06:02,395 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:02,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:06:02,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:06:02,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:02,396 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-27 04:06:02,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:02,443 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-27 04:06:02,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:06:02,444 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-27 04:06:02,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:02,446 INFO L225 Difference]: With dead ends: 35 [2018-10-27 04:06:02,446 INFO L226 Difference]: Without dead ends: 27 [2018-10-27 04:06:02,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:02,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-27 04:06:02,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-27 04:06:02,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 04:06:02,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-27 04:06:02,453 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-27 04:06:02,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:02,454 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-27 04:06:02,454 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:06:02,454 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-27 04:06:02,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:06:02,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:02,455 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:02,455 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:02,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:02,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-27 04:06:02,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:02,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:02,457 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:02,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:02,457 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:02,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:02,549 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:02,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:02,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:02,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:02,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:02,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:02,551 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 04:06:02,564 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:02,565 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:02,590 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:06:02,590 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:02,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:02,884 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 6 [2018-10-27 04:06:02,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:02,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:02,979 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,000 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 04:06:03,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-27 04:06:03,001 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:03,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:06:03,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:06:03,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:03,002 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-27 04:06:03,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:03,017 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-27 04:06:03,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:06:03,019 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-27 04:06:03,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:03,020 INFO L225 Difference]: With dead ends: 35 [2018-10-27 04:06:03,020 INFO L226 Difference]: Without dead ends: 27 [2018-10-27 04:06:03,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:03,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-27 04:06:03,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-27 04:06:03,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 04:06:03,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-27 04:06:03,027 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-27 04:06:03,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:03,027 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-27 04:06:03,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:06:03,028 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-27 04:06:03,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:06:03,029 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:03,029 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:03,029 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:03,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:03,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-27 04:06:03,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:03,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:03,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:03,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:03,234 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,234 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:03,234 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:03,235 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:03,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,235 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 04:06:03,248 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:03,249 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:03,258 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:06:03,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:03,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:03,393 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:03,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 04:06:03,421 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:03,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:06:03,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:06:03,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:03,422 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-27 04:06:03,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:03,475 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-27 04:06:03,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:06:03,475 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-27 04:06:03,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:03,476 INFO L225 Difference]: With dead ends: 35 [2018-10-27 04:06:03,476 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 04:06:03,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:03,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 04:06:03,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-27 04:06:03,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 04:06:03,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-27 04:06:03,483 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-27 04:06:03,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:03,483 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-27 04:06:03,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:06:03,484 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-27 04:06:03,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 04:06:03,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:03,485 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:03,485 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:03,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:03,485 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-27 04:06:03,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:03,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:03,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:03,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:03,632 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,632 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:03,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:03,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:03,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,633 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 04:06:03,642 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:03,643 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:03,668 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:03,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:03,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:03,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:03,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 04:06:03,834 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:03,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:06:03,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:06:03,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:03,835 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-27 04:06:03,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:03,924 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-27 04:06:03,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:06:03,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-27 04:06:03,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:03,926 INFO L225 Difference]: With dead ends: 38 [2018-10-27 04:06:03,926 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 04:06:03,927 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:03,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 04:06:03,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-27 04:06:03,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 04:06:03,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-27 04:06:03,932 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-27 04:06:03,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:03,933 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-27 04:06:03,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:06:03,933 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-27 04:06:03,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 04:06:03,934 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:03,934 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:03,934 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:03,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:03,934 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-27 04:06:03,935 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:03,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,935 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:03,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:03,936 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:03,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:04,266 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:04,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:04,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:04,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:04,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:04,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:04,267 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 04:06:04,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:04,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:04,304 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:04,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:04,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:04,313 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:04,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:04,582 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:04,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:04,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 04:06:04,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:04,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:06:04,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:06:04,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:04,604 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-10-27 04:06:04,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:04,680 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-10-27 04:06:04,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:06:04,680 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-27 04:06:04,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:04,681 INFO L225 Difference]: With dead ends: 41 [2018-10-27 04:06:04,682 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 04:06:04,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:04,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 04:06:04,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-27 04:06:04,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-27 04:06:04,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-27 04:06:04,688 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-10-27 04:06:04,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:04,688 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-27 04:06:04,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:06:04,688 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-27 04:06:04,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 04:06:04,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:04,689 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:04,689 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:04,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:04,690 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-27 04:06:04,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:04,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:04,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:04,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:04,691 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:04,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:04,835 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:04,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:04,835 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:04,835 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:04,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:04,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:04,836 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 04:06:04,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:04,845 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:04,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:04,855 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:04,865 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:04,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:05,434 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:05,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:05,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 04:06:05,454 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:05,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:06:05,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:06:05,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:05,455 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-10-27 04:06:05,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:05,570 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-10-27 04:06:05,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:06:05,574 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-27 04:06:05,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:05,575 INFO L225 Difference]: With dead ends: 44 [2018-10-27 04:06:05,575 INFO L226 Difference]: Without dead ends: 39 [2018-10-27 04:06:05,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:05,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-27 04:06:05,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-27 04:06:05,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 04:06:05,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-27 04:06:05,585 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-10-27 04:06:05,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:05,585 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-27 04:06:05,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:06:05,586 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-27 04:06:05,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 04:06:05,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:05,587 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:05,587 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:05,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:05,587 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-10-27 04:06:05,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:05,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:05,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:05,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:05,589 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:05,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:05,785 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:05,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:05,785 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:05,786 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:05,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:05,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:05,786 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:05,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:05,795 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:05,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:05,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:05,842 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:05,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:06,011 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:06,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 04:06:06,034 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:06,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:06:06,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:06:06,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:06,035 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-10-27 04:06:06,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:06,110 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-27 04:06:06,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:06:06,111 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-27 04:06:06,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:06,112 INFO L225 Difference]: With dead ends: 47 [2018-10-27 04:06:06,112 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 04:06:06,113 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:06,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 04:06:06,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-27 04:06:06,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-27 04:06:06,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-27 04:06:06,119 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-10-27 04:06:06,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:06,119 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-27 04:06:06,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:06:06,120 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-27 04:06:06,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 04:06:06,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:06,121 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:06,121 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:06,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:06,121 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-27 04:06:06,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:06,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:06,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:06,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:06,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:06,455 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:06,456 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:06,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:06,456 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:06,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:06,456 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 04:06:06,467 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:06,467 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:06,534 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:06:06,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:06,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:06,580 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:06,902 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:06,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:06,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:06:06,922 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:06,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:06:06,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:06:06,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:06,923 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-10-27 04:06:07,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:07,037 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-10-27 04:06:07,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:06:07,038 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-27 04:06:07,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:07,040 INFO L225 Difference]: With dead ends: 50 [2018-10-27 04:06:07,040 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 04:06:07,041 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:07,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 04:06:07,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-27 04:06:07,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 04:06:07,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-27 04:06:07,046 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-10-27 04:06:07,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:07,047 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-27 04:06:07,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:06:07,047 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-27 04:06:07,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 04:06:07,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:07,049 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:07,049 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:07,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:07,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-10-27 04:06:07,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:07,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:07,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:07,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:07,050 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:07,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:07,264 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:07,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:07,265 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:07,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:07,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:07,265 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 04:06:07,274 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:07,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:07,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:06:07,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:07,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:07,340 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:07,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:08,898 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:08,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:08,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:06:08,919 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:08,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:06:08,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:06:08,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:08,920 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-10-27 04:06:09,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:09,350 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-10-27 04:06:09,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:06:09,350 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-27 04:06:09,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:09,351 INFO L225 Difference]: With dead ends: 53 [2018-10-27 04:06:09,351 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 04:06:09,352 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:09,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 04:06:09,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-27 04:06:09,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-27 04:06:09,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-10-27 04:06:09,364 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-10-27 04:06:09,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:09,364 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-10-27 04:06:09,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:06:09,365 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-10-27 04:06:09,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 04:06:09,366 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:09,366 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:09,366 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:09,366 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:09,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-27 04:06:09,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:09,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:09,367 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:09,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:09,367 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:09,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:09,534 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:09,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:09,535 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:09,535 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:09,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:09,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:09,536 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 04:06:09,546 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:09,547 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:09,558 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:09,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:09,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:09,573 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:09,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:10,716 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:10,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:10,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 04:06:10,737 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:10,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:06:10,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:06:10,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:10,738 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-10-27 04:06:10,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:10,926 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-10-27 04:06:10,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 04:06:10,928 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-27 04:06:10,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:10,929 INFO L225 Difference]: With dead ends: 56 [2018-10-27 04:06:10,930 INFO L226 Difference]: Without dead ends: 51 [2018-10-27 04:06:10,930 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:10,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-27 04:06:10,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-27 04:06:10,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 04:06:10,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-10-27 04:06:10,939 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-10-27 04:06:10,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:10,940 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-10-27 04:06:10,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:06:10,940 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-10-27 04:06:10,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 04:06:10,941 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:10,941 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:10,942 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:10,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:10,942 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-10-27 04:06:10,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:10,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:10,943 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:10,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:10,943 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:10,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:11,158 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:11,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:11,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:11,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:11,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:11,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:11,159 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 04:06:11,168 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:11,168 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:11,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:11,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:11,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:11,206 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:11,207 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:12,769 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:12,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:12,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 04:06:12,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:12,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:06:12,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:06:12,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:12,791 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 9 states. [2018-10-27 04:06:12,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:12,994 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-10-27 04:06:12,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 04:06:12,994 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-27 04:06:12,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:12,996 INFO L225 Difference]: With dead ends: 59 [2018-10-27 04:06:12,996 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 04:06:12,997 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:12,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 04:06:13,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-27 04:06:13,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-27 04:06:13,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-10-27 04:06:13,008 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 29 [2018-10-27 04:06:13,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:13,009 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-10-27 04:06:13,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:06:13,009 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-10-27 04:06:13,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 04:06:13,010 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:13,010 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:13,010 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:13,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:13,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-27 04:06:13,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:13,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:13,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:13,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:13,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:13,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:13,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:13,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:13,204 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:13,204 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:13,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:13,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:13,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:13,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:13,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:13,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:13,251 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:13,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:14,364 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:14,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:14,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 04:06:14,391 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:14,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:06:14,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:06:14,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:14,392 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 10 states. [2018-10-27 04:06:14,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:14,568 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-10-27 04:06:14,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:06:14,569 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 04:06:14,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:14,570 INFO L225 Difference]: With dead ends: 62 [2018-10-27 04:06:14,570 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 04:06:14,571 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:14,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 04:06:14,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-27 04:06:14,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 04:06:14,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-10-27 04:06:14,578 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 32 [2018-10-27 04:06:14,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:14,579 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-10-27 04:06:14,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:06:14,579 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-10-27 04:06:14,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 04:06:14,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:14,580 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:14,581 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:14,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:14,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1051431133, now seen corresponding path program 7 times [2018-10-27 04:06:14,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:14,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:14,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:14,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:14,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:14,712 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:14,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:14,712 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:14,712 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:14,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:14,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:14,713 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 04:06:14,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:14,721 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:14,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:14,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:14,746 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:14,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:15,732 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:15,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:15,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 04:06:15,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:15,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:06:15,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:06:15,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:15,753 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 10 states. [2018-10-27 04:06:15,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:15,873 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-10-27 04:06:15,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:06:15,873 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 04:06:15,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:15,874 INFO L225 Difference]: With dead ends: 65 [2018-10-27 04:06:15,874 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 04:06:15,875 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:15,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 04:06:15,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-27 04:06:15,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-27 04:06:15,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-10-27 04:06:15,880 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 32 [2018-10-27 04:06:15,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:15,880 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-10-27 04:06:15,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:06:15,880 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-10-27 04:06:15,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:06:15,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:15,881 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:15,881 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:15,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:15,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-27 04:06:15,882 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:15,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:15,883 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:15,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:15,883 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:15,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:16,882 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:16,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:16,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:16,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:16,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:16,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:16,883 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 04:06:16,891 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:16,892 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:19,625 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:06:19,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:19,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:19,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:21,254 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:21,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:21,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:06:21,275 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:21,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:06:21,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:06:21,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:21,276 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 11 states. [2018-10-27 04:06:21,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:21,583 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-10-27 04:06:21,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:06:21,585 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-27 04:06:21,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:21,586 INFO L225 Difference]: With dead ends: 68 [2018-10-27 04:06:21,586 INFO L226 Difference]: Without dead ends: 63 [2018-10-27 04:06:21,587 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:21,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-27 04:06:21,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-27 04:06:21,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-27 04:06:21,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2018-10-27 04:06:21,601 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 35 [2018-10-27 04:06:21,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:21,601 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2018-10-27 04:06:21,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:06:21,602 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2018-10-27 04:06:21,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:06:21,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:21,602 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:21,602 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:21,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:21,603 INFO L82 PathProgramCache]: Analyzing trace with hash 598101598, now seen corresponding path program 8 times [2018-10-27 04:06:21,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:21,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:21,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:21,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:21,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:21,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:21,840 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:21,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:21,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:21,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:21,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:21,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:21,841 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 04:06:21,848 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:21,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:22,036 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:06:22,036 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:22,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:22,047 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:22,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:24,393 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:24,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:24,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:06:24,414 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:24,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:06:24,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:06:24,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:24,416 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 11 states. [2018-10-27 04:06:24,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:24,593 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-10-27 04:06:24,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:06:24,594 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-27 04:06:24,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:24,594 INFO L225 Difference]: With dead ends: 71 [2018-10-27 04:06:24,595 INFO L226 Difference]: Without dead ends: 66 [2018-10-27 04:06:24,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:24,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-27 04:06:24,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-27 04:06:24,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-27 04:06:24,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-10-27 04:06:24,600 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 35 [2018-10-27 04:06:24,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:24,600 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-10-27 04:06:24,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:06:24,600 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-10-27 04:06:24,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 04:06:24,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:24,601 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:24,601 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:24,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:24,601 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-27 04:06:24,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:24,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,602 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:24,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,602 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:24,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:24,861 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:24,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:24,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:24,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:24,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:24,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:24,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:24,871 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:24,871 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:24,885 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:24,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:24,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:24,900 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:24,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:26,067 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:26,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 04:06:26,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:26,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:06:26,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:06:26,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:26,088 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 12 states. [2018-10-27 04:06:26,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:26,496 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-10-27 04:06:26,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:06:26,496 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-27 04:06:26,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:26,497 INFO L225 Difference]: With dead ends: 74 [2018-10-27 04:06:26,497 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 04:06:26,498 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:26,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 04:06:26,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-27 04:06:26,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-27 04:06:26,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-10-27 04:06:26,502 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 38 [2018-10-27 04:06:26,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:26,502 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-10-27 04:06:26,502 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:06:26,502 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-10-27 04:06:26,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 04:06:26,503 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:26,503 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:26,503 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:26,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:26,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1164896963, now seen corresponding path program 9 times [2018-10-27 04:06:26,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:26,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:26,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,504 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:26,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,770 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,771 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:26,771 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:26,771 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:26,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,771 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 04:06:26,781 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:26,781 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:26,795 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:26,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:26,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:26,806 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:28,496 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:28,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 04:06:28,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:28,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:06:28,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:06:28,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:28,519 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 12 states. [2018-10-27 04:06:28,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:28,731 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-27 04:06:28,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:06:28,733 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-27 04:06:28,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:28,734 INFO L225 Difference]: With dead ends: 77 [2018-10-27 04:06:28,734 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 04:06:28,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:28,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 04:06:28,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-27 04:06:28,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-27 04:06:28,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2018-10-27 04:06:28,739 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 38 [2018-10-27 04:06:28,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:28,739 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2018-10-27 04:06:28,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:06:28,740 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2018-10-27 04:06:28,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 04:06:28,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:28,740 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:28,740 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:28,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:28,741 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-27 04:06:28,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:28,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:28,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:28,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:28,915 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:28,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:28,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:28,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,916 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 04:06:28,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:28,923 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:28,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:28,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:28,971 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,971 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:32,026 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:32,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 04:06:32,047 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:32,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:06:32,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:06:32,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:32,048 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 13 states. [2018-10-27 04:06:32,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:32,368 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-10-27 04:06:32,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:06:32,369 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-27 04:06:32,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:32,370 INFO L225 Difference]: With dead ends: 80 [2018-10-27 04:06:32,370 INFO L226 Difference]: Without dead ends: 75 [2018-10-27 04:06:32,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:32,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-27 04:06:32,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-27 04:06:32,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 04:06:32,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2018-10-27 04:06:32,375 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 41 [2018-10-27 04:06:32,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:32,375 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2018-10-27 04:06:32,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:06:32,376 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2018-10-27 04:06:32,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 04:06:32,376 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:32,376 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:32,376 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:32,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:32,377 INFO L82 PathProgramCache]: Analyzing trace with hash 500035070, now seen corresponding path program 10 times [2018-10-27 04:06:32,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:32,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:32,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:32,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:32,378 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:32,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:32,563 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:32,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:32,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:32,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:32,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:32,564 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 04:06:32,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:32,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:32,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:32,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:32,599 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:36,254 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:36,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:36,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 04:06:36,274 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:36,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:06:36,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:06:36,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:36,275 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 13 states. [2018-10-27 04:06:36,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:36,665 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-10-27 04:06:36,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:06:36,667 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-27 04:06:36,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:36,667 INFO L225 Difference]: With dead ends: 83 [2018-10-27 04:06:36,667 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 04:06:36,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:36,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 04:06:36,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-27 04:06:36,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 04:06:36,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-10-27 04:06:36,671 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 41 [2018-10-27 04:06:36,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:36,672 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-10-27 04:06:36,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:06:36,672 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-10-27 04:06:36,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 04:06:36,672 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:36,672 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:36,673 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:36,673 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:36,673 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-27 04:06:36,673 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:36,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:36,674 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:36,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:36,674 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:36,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:37,268 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:37,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:37,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:37,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:37,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:37,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:37,269 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 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 04:06:37,285 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:37,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:37,831 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:06:37,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:37,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:37,931 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:37,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:38,482 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:06:39,825 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:06:40,789 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:40,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:40,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15] total 27 [2018-10-27 04:06:40,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:40,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:06:40,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:06:40,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:06:40,810 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 14 states. [2018-10-27 04:06:41,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:41,517 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-10-27 04:06:41,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:06:41,518 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-27 04:06:41,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:41,519 INFO L225 Difference]: With dead ends: 86 [2018-10-27 04:06:41,519 INFO L226 Difference]: Without dead ends: 81 [2018-10-27 04:06:41,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:06:41,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-27 04:06:41,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-27 04:06:41,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-27 04:06:41,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-10-27 04:06:41,525 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 44 [2018-10-27 04:06:41,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:41,525 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-10-27 04:06:41,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:06:41,525 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-10-27 04:06:41,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 04:06:41,526 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:41,526 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:41,526 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:41,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:41,527 INFO L82 PathProgramCache]: Analyzing trace with hash -2087071331, now seen corresponding path program 11 times [2018-10-27 04:06:41,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:41,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:41,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:41,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:41,528 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:41,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:42,169 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:42,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:42,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:42,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:42,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:42,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:42,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:42,177 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:42,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:42,956 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:06:42,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:42,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:42,986 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:42,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:47,352 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:47,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:47,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 04:06:47,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:47,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:06:47,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:06:47,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:06:47,373 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 14 states. [2018-10-27 04:06:47,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:47,649 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-10-27 04:06:47,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:06:47,649 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-27 04:06:47,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:47,650 INFO L225 Difference]: With dead ends: 89 [2018-10-27 04:06:47,650 INFO L226 Difference]: Without dead ends: 84 [2018-10-27 04:06:47,651 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:06:47,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-27 04:06:47,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-27 04:06:47,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-27 04:06:47,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2018-10-27 04:06:47,655 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 44 [2018-10-27 04:06:47,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:47,656 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2018-10-27 04:06:47,656 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:06:47,656 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2018-10-27 04:06:47,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 04:06:47,656 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:47,656 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:47,657 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:47,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:47,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-27 04:06:47,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:47,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:47,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:47,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:47,658 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:47,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:47,958 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:47,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:47,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:47,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:47,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:47,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:47,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:47,966 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:47,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:47,983 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:47,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:47,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:48,009 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:48,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:50,632 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:50,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:50,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 04:06:50,652 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:50,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:06:50,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:06:50,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:06:50,653 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2018-10-27 04:06:50,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:50,975 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-10-27 04:06:50,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 04:06:50,976 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-27 04:06:50,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:50,977 INFO L225 Difference]: With dead ends: 92 [2018-10-27 04:06:50,977 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 04:06:50,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:06:50,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 04:06:50,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-27 04:06:50,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-27 04:06:50,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2018-10-27 04:06:50,983 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 47 [2018-10-27 04:06:50,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:50,984 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2018-10-27 04:06:50,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:06:50,984 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2018-10-27 04:06:50,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 04:06:50,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:50,985 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:50,985 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:50,985 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:50,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1385736802, now seen corresponding path program 12 times [2018-10-27 04:06:50,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:50,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:50,986 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:50,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:50,986 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:50,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:51,366 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:51,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:51,366 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:51,366 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:51,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:51,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:51,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-27 04:06:51,381 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:51,382 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:51,420 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:51,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:51,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:51,501 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:51,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:54,294 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:54,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:54,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 04:06:54,314 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:54,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:06:54,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:06:54,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:06:54,316 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 15 states. [2018-10-27 04:06:54,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:54,588 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2018-10-27 04:06:54,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 04:06:54,588 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-27 04:06:54,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:54,589 INFO L225 Difference]: With dead ends: 95 [2018-10-27 04:06:54,590 INFO L226 Difference]: Without dead ends: 90 [2018-10-27 04:06:54,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:06:54,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-27 04:06:54,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-27 04:06:54,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-27 04:06:54,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-10-27 04:06:54,594 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 47 [2018-10-27 04:06:54,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:54,595 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-10-27 04:06:54,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:06:54,595 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-10-27 04:06:54,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 04:06:54,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:54,595 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:54,596 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:54,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:54,596 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-27 04:06:54,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:54,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:54,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:54,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:54,597 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:54,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:56,017 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:56,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:56,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:56,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:56,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:56,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:56,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:56,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:56,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:56,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:56,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:56,068 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:56,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:00,363 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:00,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:00,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 04:07:00,384 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:00,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:07:00,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:07:00,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:07:00,385 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 16 states. [2018-10-27 04:07:00,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:00,952 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2018-10-27 04:07:00,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:07:00,953 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-27 04:07:00,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:00,954 INFO L225 Difference]: With dead ends: 98 [2018-10-27 04:07:00,954 INFO L226 Difference]: Without dead ends: 93 [2018-10-27 04:07:00,955 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:07:00,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-27 04:07:00,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-27 04:07:00,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-27 04:07:00,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-10-27 04:07:00,960 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 50 [2018-10-27 04:07:00,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:00,961 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-10-27 04:07:00,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:07:00,961 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-10-27 04:07:00,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 04:07:00,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:00,962 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:00,962 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:00,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:00,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1350288893, now seen corresponding path program 13 times [2018-10-27 04:07:00,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:00,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:00,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,964 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:00,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:02,025 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:02,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,025 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:02,025 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:02,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:02,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:02,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:02,033 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:02,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:02,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:02,068 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:02,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:08,034 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:08,064 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:08,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 04:07:08,064 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:08,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:07:08,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:07:08,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-27 04:07:08,066 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 16 states. [2018-10-27 04:07:08,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:08,420 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2018-10-27 04:07:08,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:07:08,420 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-27 04:07:08,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:08,421 INFO L225 Difference]: With dead ends: 101 [2018-10-27 04:07:08,421 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 04:07:08,423 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-27 04:07:08,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 04:07:08,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-27 04:07:08,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-27 04:07:08,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2018-10-27 04:07:08,428 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 50 [2018-10-27 04:07:08,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:08,428 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2018-10-27 04:07:08,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:07:08,428 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2018-10-27 04:07:08,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:07:08,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:08,429 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:08,429 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:08,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:08,430 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-27 04:07:08,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:08,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:08,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:08,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:08,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:08,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:08,709 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:08,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:08,710 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:08,710 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:08,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:08,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:08,710 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:08,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:08,718 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:15,101 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:07:15,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:15,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:15,324 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:15,325 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:19,848 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:19,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:19,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 04:07:19,869 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:19,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:07:19,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:07:19,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:07:19,870 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 17 states. [2018-10-27 04:07:20,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:20,311 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2018-10-27 04:07:20,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:07:20,312 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-27 04:07:20,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:20,313 INFO L225 Difference]: With dead ends: 104 [2018-10-27 04:07:20,313 INFO L226 Difference]: Without dead ends: 99 [2018-10-27 04:07:20,314 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:07:20,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-27 04:07:20,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-27 04:07:20,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-27 04:07:20,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-10-27 04:07:20,319 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 53 [2018-10-27 04:07:20,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:20,319 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-10-27 04:07:20,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:07:20,319 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-10-27 04:07:20,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:07:20,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:20,320 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:20,320 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:20,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:20,321 INFO L82 PathProgramCache]: Analyzing trace with hash 402425150, now seen corresponding path program 14 times [2018-10-27 04:07:20,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:20,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:20,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:20,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:20,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:20,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:20,895 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:20,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:20,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:20,895 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:20,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:20,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:20,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:20,903 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:20,904 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:21,670 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:07:21,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:21,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:21,709 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:21,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:22,265 WARN L179 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:07:22,710 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:07:23,720 WARN L179 SmtUtils]: Spent 616.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:07:24,789 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:07:25,379 WARN L179 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:07:26,011 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:26,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:26,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 18] total 33 [2018-10-27 04:07:26,031 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:26,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:07:26,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:07:26,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:07:26,032 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 17 states. [2018-10-27 04:07:26,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:26,379 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-10-27 04:07:26,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:07:26,380 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-27 04:07:26,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:26,381 INFO L225 Difference]: With dead ends: 107 [2018-10-27 04:07:26,381 INFO L226 Difference]: Without dead ends: 102 [2018-10-27 04:07:26,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:07:26,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-27 04:07:26,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-27 04:07:26,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-27 04:07:26,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-10-27 04:07:26,388 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 53 [2018-10-27 04:07:26,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:26,388 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-10-27 04:07:26,388 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:07:26,388 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-10-27 04:07:26,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 04:07:26,389 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:26,389 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:26,389 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:26,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:26,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-27 04:07:26,390 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:26,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:26,391 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:26,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:26,391 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:26,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:26,649 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:26,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:26,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:26,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:26,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:26,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:26,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:26,658 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:26,659 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:26,684 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:26,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:26,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:26,708 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:26,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:34,785 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:34,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:34,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 04:07:34,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:34,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:07:34,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:07:34,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:34,807 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 18 states. [2018-10-27 04:07:35,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:35,278 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-10-27 04:07:35,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:07:35,279 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-27 04:07:35,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:35,280 INFO L225 Difference]: With dead ends: 110 [2018-10-27 04:07:35,281 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 04:07:35,282 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:35,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 04:07:35,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-27 04:07:35,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-27 04:07:35,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-10-27 04:07:35,287 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 56 [2018-10-27 04:07:35,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:35,287 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-10-27 04:07:35,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:07:35,287 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-10-27 04:07:35,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 04:07:35,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:35,288 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:35,288 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:35,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:35,289 INFO L82 PathProgramCache]: Analyzing trace with hash 2003628637, now seen corresponding path program 15 times [2018-10-27 04:07:35,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:35,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:35,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:35,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:35,290 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:35,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:35,729 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:35,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:35,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:35,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:35,730 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:35,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:35,730 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:35,737 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:35,737 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:35,755 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:35,755 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:35,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:35,780 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:35,780 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:43,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:43,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 04:07:43,109 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:43,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:07:43,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:07:43,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:43,111 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 18 states. [2018-10-27 04:07:43,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:43,579 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2018-10-27 04:07:43,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:07:43,580 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-27 04:07:43,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:43,580 INFO L225 Difference]: With dead ends: 113 [2018-10-27 04:07:43,580 INFO L226 Difference]: Without dead ends: 108 [2018-10-27 04:07:43,581 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:43,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-27 04:07:43,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-27 04:07:43,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-27 04:07:43,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2018-10-27 04:07:43,587 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 56 [2018-10-27 04:07:43,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:43,587 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2018-10-27 04:07:43,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:07:43,587 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2018-10-27 04:07:43,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 04:07:43,588 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:43,588 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:43,588 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:43,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:43,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-27 04:07:43,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:43,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:43,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:43,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:43,590 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:43,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:44,236 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:44,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:44,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:44,237 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:44,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:44,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:44,237 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:44,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:44,245 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:44,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:44,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:44,311 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:44,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:51,953 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:51,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:51,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 04:07:51,974 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:51,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:07:51,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:07:51,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:07:51,975 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand 19 states. [2018-10-27 04:07:52,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:52,516 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2018-10-27 04:07:52,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:07:52,516 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-27 04:07:52,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:52,517 INFO L225 Difference]: With dead ends: 116 [2018-10-27 04:07:52,518 INFO L226 Difference]: Without dead ends: 111 [2018-10-27 04:07:52,519 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:07:52,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-27 04:07:52,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-27 04:07:52,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-27 04:07:52,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2018-10-27 04:07:52,524 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 59 [2018-10-27 04:07:52,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:52,525 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2018-10-27 04:07:52,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:07:52,525 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2018-10-27 04:07:52,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 04:07:52,526 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:52,526 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:52,526 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:52,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:52,526 INFO L82 PathProgramCache]: Analyzing trace with hash -745046818, now seen corresponding path program 16 times [2018-10-27 04:07:52,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:52,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:52,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:52,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:52,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:52,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:52,958 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:52,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:52,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:52,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:52,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:52,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:52,959 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:52,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:52,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:52,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:52,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:53,032 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:53,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:59,970 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:59,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:59,990 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 04:07:59,990 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:59,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:07:59,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:07:59,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:07:59,991 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand 19 states. [2018-10-27 04:08:00,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:00,528 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2018-10-27 04:08:00,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:08:00,529 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-27 04:08:00,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:00,530 INFO L225 Difference]: With dead ends: 119 [2018-10-27 04:08:00,530 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 04:08:00,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:08:00,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 04:08:00,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-27 04:08:00,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-27 04:08:00,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-10-27 04:08:00,535 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 59 [2018-10-27 04:08:00,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:00,536 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-10-27 04:08:00,536 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:08:00,536 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-10-27 04:08:00,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 04:08:00,537 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:00,537 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:00,537 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:00,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:00,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-27 04:08:00,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:00,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:00,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:00,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:00,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:00,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:00,862 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:00,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:00,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:00,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:00,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:00,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:00,863 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:00,870 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:00,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:08:05,164 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 04:08:05,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:05,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:05,198 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:05,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:12,674 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:12,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:12,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 04:08:12,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:12,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:08:12,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:08:12,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:08:12,695 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 20 states. [2018-10-27 04:08:13,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:13,297 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-10-27 04:08:13,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:08:13,299 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-27 04:08:13,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:13,300 INFO L225 Difference]: With dead ends: 122 [2018-10-27 04:08:13,300 INFO L226 Difference]: Without dead ends: 117 [2018-10-27 04:08:13,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:08:13,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-27 04:08:13,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-27 04:08:13,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-27 04:08:13,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2018-10-27 04:08:13,305 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 62 [2018-10-27 04:08:13,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:13,305 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2018-10-27 04:08:13,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:08:13,305 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2018-10-27 04:08:13,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 04:08:13,306 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:13,306 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:13,306 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:13,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:13,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1310938813, now seen corresponding path program 17 times [2018-10-27 04:08:13,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:13,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:13,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:13,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:13,307 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:13,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:13,873 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:13,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:13,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:13,874 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:13,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:13,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:13,874 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:13,882 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:13,882 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:08:34,120 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 04:08:34,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:34,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:34,208 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:34,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:34,480 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:08:35,814 WARN L179 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:08:39,527 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 04:08:40,448 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:40,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:40,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 21] total 39 [2018-10-27 04:08:40,470 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:40,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:08:40,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:08:40,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:08:40,471 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand 20 states. [2018-10-27 04:08:40,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:40,961 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2018-10-27 04:08:40,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:08:40,962 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-27 04:08:40,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:40,963 INFO L225 Difference]: With dead ends: 125 [2018-10-27 04:08:40,963 INFO L226 Difference]: Without dead ends: 120 [2018-10-27 04:08:40,964 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:08:40,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-27 04:08:40,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-27 04:08:40,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-27 04:08:40,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-10-27 04:08:40,970 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 62 [2018-10-27 04:08:40,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:40,970 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-10-27 04:08:40,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:08:40,970 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-10-27 04:08:40,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 04:08:40,971 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:40,971 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:40,971 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:40,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:40,972 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-27 04:08:40,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:40,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:40,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:40,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:40,973 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:40,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:41,890 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:41,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:41,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:41,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:41,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:41,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:41,891 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:41,900 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:41,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:41,921 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:41,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:41,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:41,948 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:41,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:52,100 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:52,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:52,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 04:08:52,120 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:52,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:08:52,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:08:52,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:08:52,122 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 21 states. [2018-10-27 04:08:52,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:52,780 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2018-10-27 04:08:52,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 04:08:52,781 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-27 04:08:52,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:52,782 INFO L225 Difference]: With dead ends: 128 [2018-10-27 04:08:52,782 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 04:08:52,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:08:52,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 04:08:52,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-27 04:08:52,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 04:08:52,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-10-27 04:08:52,788 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 65 [2018-10-27 04:08:52,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:52,789 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-10-27 04:08:52,789 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:08:52,789 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-10-27 04:08:52,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 04:08:52,790 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:52,790 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:52,790 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:52,790 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:52,790 INFO L82 PathProgramCache]: Analyzing trace with hash 650263678, now seen corresponding path program 18 times [2018-10-27 04:08:52,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:52,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:52,791 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:52,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:52,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:52,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:53,423 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:53,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:53,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:53,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:53,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:53,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:53,424 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:08:53,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:53,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:53,448 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:53,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:53,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:53,484 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:53,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:04,452 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 492 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:04,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:04,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 04:09:04,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:04,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:09:04,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:09:04,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-27 04:09:04,473 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 21 states. [2018-10-27 04:09:05,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:05,016 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2018-10-27 04:09:05,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 04:09:05,016 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-27 04:09:05,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:05,018 INFO L225 Difference]: With dead ends: 131 [2018-10-27 04:09:05,018 INFO L226 Difference]: Without dead ends: 126 [2018-10-27 04:09:05,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-27 04:09:05,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-27 04:09:05,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-27 04:09:05,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-27 04:09:05,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2018-10-27 04:09:05,024 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 65 [2018-10-27 04:09:05,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:05,025 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2018-10-27 04:09:05,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:09:05,025 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2018-10-27 04:09:05,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 04:09:05,026 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:05,026 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:05,026 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:05,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:05,026 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-27 04:09:05,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:05,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:05,027 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:09:05,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:05,027 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:05,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:05,772 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:05,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:05,772 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:05,772 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:05,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:05,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:05,773 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:05,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:05,780 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:09:05,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:05,804 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:05,819 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:05,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:16,612 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:16,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:16,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 04:09:16,634 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:16,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:09:16,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:09:16,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 04:09:16,635 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand 22 states. [2018-10-27 04:09:17,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:17,443 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2018-10-27 04:09:17,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:09:17,444 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-27 04:09:17,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:17,445 INFO L225 Difference]: With dead ends: 134 [2018-10-27 04:09:17,445 INFO L226 Difference]: Without dead ends: 129 [2018-10-27 04:09:17,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 04:09:17,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-27 04:09:17,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-27 04:09:17,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-27 04:09:17,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2018-10-27 04:09:17,451 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 68 [2018-10-27 04:09:17,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:17,451 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2018-10-27 04:09:17,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:09:17,451 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2018-10-27 04:09:17,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 04:09:17,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:17,452 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:17,452 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:17,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:17,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1982532835, now seen corresponding path program 19 times [2018-10-27 04:09:17,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:17,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:17,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:17,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:17,454 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:17,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:18,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:18,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:18,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:18,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:18,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:18,061 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:18,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:18,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:09:18,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:18,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:18,102 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:18,102 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:32,258 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 548 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:32,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:32,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 04:09:32,278 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:32,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:09:32,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:09:32,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1240, Unknown=1, NotChecked=0, Total=1722 [2018-10-27 04:09:32,279 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 22 states. [2018-10-27 04:09:32,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:09:32,870 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-10-27 04:09:32,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:09:32,870 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-27 04:09:32,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:09:32,872 INFO L225 Difference]: With dead ends: 137 [2018-10-27 04:09:32,872 INFO L226 Difference]: Without dead ends: 132 [2018-10-27 04:09:32,873 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=481, Invalid=1240, Unknown=1, NotChecked=0, Total=1722 [2018-10-27 04:09:32,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-27 04:09:32,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2018-10-27 04:09:32,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-27 04:09:32,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2018-10-27 04:09:32,879 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 68 [2018-10-27 04:09:32,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:09:32,879 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2018-10-27 04:09:32,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:09:32,880 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2018-10-27 04:09:32,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 04:09:32,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:09:32,880 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:09:32,881 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:09:32,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:09:32,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-27 04:09:32,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:09:32,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:32,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:09:32,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:09:32,882 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:09:32,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:33,572 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:33,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:33,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:33,572 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:33,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:33,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:33,573 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:09:33,580 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:09:33,580 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:09:45,065 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 04:09:45,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:09:45,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:09:45,116 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:45,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:09:59,540 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:09:59,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:09:59,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 04:09:59,560 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:09:59,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:09:59,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:09:59,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:09:59,561 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand 23 states. [2018-10-27 04:10:00,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:00,333 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2018-10-27 04:10:00,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:10:00,334 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-27 04:10:00,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:00,335 INFO L225 Difference]: With dead ends: 140 [2018-10-27 04:10:00,335 INFO L226 Difference]: Without dead ends: 135 [2018-10-27 04:10:00,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:10:00,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-27 04:10:00,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-10-27 04:10:00,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-10-27 04:10:00,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2018-10-27 04:10:00,343 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 71 [2018-10-27 04:10:00,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:00,343 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2018-10-27 04:10:00,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:10:00,343 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2018-10-27 04:10:00,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 04:10:00,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:00,344 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:00,344 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:00,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:00,345 INFO L82 PathProgramCache]: Analyzing trace with hash -930692066, now seen corresponding path program 20 times [2018-10-27 04:10:00,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:00,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:00,345 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:10:00,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:00,346 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:00,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:01,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:01,042 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:01,042 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:01,042 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:01,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:01,042 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:10:01,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:10:01,051 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